Exhibit 99.1

601 – 90 Eglinton Ave East, Toronto, Ontario, Canada M4P 2Y3 +1 416 362 5135 | www.micon - international.com NI 43 - 101 Technical Report, Mineral Resource Estimate for the Trixie Deposit, Tintic Project, Utah, United States of America Effective Date: March 14, 2024 Report Date: April 25, 2024 Prepared By: William J. Lewis, P.Geo. Ing. Alan J. San Martin, MAusIMM(CP) Richard Gowans, P.Eng. OSISKO DEVELOPMENT CORP. 1100, av des Canadiens - de - Montréal Suite 300, P.O. Box 211 Montréal, QC H3B 2S2 Tel: 1.514.940.0685

Page Table of Contents 1. SUMMARY............................................................................................................... 1 2. GENERAL ............................................................................................................................. ... ..... 1 3. PROPERTY LOCATION, DESCRIPTION AND OWNERSHIP........................................................... 2 4. ACCESSIBILITY, CLIMATE, PHYSIOGRAPHY, LOCAL RESOURCES AND INFRASTRUCTURE....... 2 5. HISTORY ............................................................................................................................. ... ...... 4 1. Tintic District – Early Mining History (1869 to 2002) ......................................................... 4 2. Trixie – Exploration Underground Development and Mining (1927 to 1995) ................... 5 3. Trixie Exploration and Production (2000 to 2002) ............................................................ 6 4. Trixie Exploration and Production (2019 to 2021) ............................................................ 6 6. GEOLOGICAL SETTING AND MINERALIZATION .......................................................................... 8 1. Geological Setting .............................................................................................................. 8 2. District Geology.................................................................................................................. 8 3. District Mineralization and Structure ................................................................................ 9 4. Geology, Structure and Mineralization at Trixie ............................................................... 9 7. EXPLORATION PROGRAMS ....................................................................................................... 10 1. 2023 Regional Surface Exploration ................................................................................. 11 2. Exploration Drilling Programs ......................................................................................... 12 8. METALLURGICAL TESTWORK ................................................................................................... 13 1. Sample Provenance ......................................................................................................... 13 2. Metallurgical Testwork .................................................................................................... 14 3. Testwork Results .............................................................................................................. 15 4. Additional Testwork......................................................................................................... 15 9. TRIXIE MINERAL RESOURCE ESTIMATE.................................................................................... 15 1. Introduction ..................................................................................................................... 15 2. Methodology .................................................................................................................... 15 3. Resource Database .......................................................................................................... 16 4. Geological Model.............................................................................................................. 16 5. Geostatistical Analysis ..................................................................................................... 16 6. Block Model and Grade Interpretation............................................................................ 18 7. Model Validation .............................................................................................................. 18 8. Mineral Resource Classification....................................................................................... 18 9. Reasonable Prospects for Eventual Economic Extraction ............................................. 18 10. Mined Void Depletion....................................................................................................... 19 11. Trixie Mineral Resource Estimate Statement.................................................................. 20 12. Mineral Resource Grade Sensitivity Analysis .................................................................. 20 10. CONCLUSIONS .......................................................................................................................... 23 1. Risks and Opportunities................................................................................................... 23 11. EXPLORATION BUDGET AND FURTHER RECOMMENDATIONS................................................ 25 12. EXPLORATION BUDGET AND OTHER EXPENDITURES ............................................................. 25 13. FURTHER RECOMMENDATIONS ............................................................................................... 26 14. INTRODUCTION......................................................................................................28 15. TERMS OF REFERENCE ............................................................................................................. 28 16. DISCUSSIONS, MEETINGS, SITE VISITS AND QUALIFIED PERSONS ........................................ 29 i Tintic Project April 25, 2024

Page 3. SOURCES OF INFORMATION..................................................................................................... 30 4. UNITS OF MEASUREMENT AND ABBREVIATIONS .................................................................... 30 5. PREVIOUS TECHNICAL REPORTS ............................................................................................. 33 3. RELIANCE ON OTHER EXPERTS.................................................................................34 4. PROPERTY DESCRIPTION AND LOCATION ..................................................................35 1. GENERAL DESCRIPTION AND LOCATION ................................................................................. 35 ii Tintic Project April 25, 2024 4.2.1 4.2.2 4.2.3 4.2 LAND TENURE, AGREEMENTS, MINERAL RIGHTS AND OWNERSHIP....................................... 36 Property Area ................................................................................................................... 36 Acquisition of the Tintic Project ...................................................................................... 36 Title, Mineral and Surface Rights Summary and Royalties............................................. 41 3. ENCUMBRANCES AND OTHER SIGNIFICANT FACTORS OR RISKS ........................................... 43 1. Encumbrances................................................................................................................. . 43 2. Other Significant Factors and Risks................................................................................. 43 4. PERMITTING AND ENVIRONMENTAL LIABILITIES .................................................................... 43 1. Environment.................................................................................................................. ... 43 2. Permits and Environmental Liabilities ............................................................................ 44 5. QP COMMENTS..................................................................................................................... ... .. 44 1. ACCESSIBILITY, CLIMATE, LOCAL RESOURCES, INFRASTRUCTURE AND PHYSIOGRAPHY .45 2. ACCESSIBILITY .......................................................................................................................... 45 3. INFRASTRUCTURE AND LOCAL RESOURCES ........................................................................... 45 4. TOPOGRAPHY, PHYSIOGRAPHY, VEGETATION AND CLIMATE ................................................. 46 5. SITE FACILITIES................................................................................................................... ... ... 46 6. HISTORY................................................................................................................48 7. INTRODUCTION................................................................................................................. ... ..... 48 8. TINTIC DISTRICT – EARLY MINING HISTORY (1869 TO 2002) ................................................... 48 1. East Tintic District ............................................................................................................ 48 9. TRIXIE – EXPLORATION UNDERGROUND DEVELOPMENT AND MINING (1927 TO 1995) ......... 51 1. Trixie Early Exploration (Pre - 1957).................................................................................. 51 2. Trixie - Shaft Sinking and Underground Development and Mining (1968 to 1992) ....... 53 3. Trixie Mine, Diluted Grade Production ............................................................................ 54 10. TRIXIE EXPLORATION AND PRODUCTION (2000 TO 2002)....................................................... 54 11. TRIXIE, EXPLORATION AND PRODUCTION (2019 TO 2021)...................................................... 56 1. TCM – Trixie, Modern Target Generation (2019 to 2020) ................................................ 56 2. TCM T2 Discovery (2020 to 2021) ..................................................................................... 57 3. TCM Underground Development and Mineral Processing (2020 to 2021) ..................... 59 12. GEOLOGICAL SETTING AND MINERALIZATION ............................................................60 13. GEOLOGICAL SETTING .............................................................................................................. 60 14. DISTRICT GEOLOGY................................................................................................................... 60 15. DISTRICT MINERALIZATION AND STRUCTURE......................................................................... 67 1. Geology, Structure and Mineralization at Trixie ............................................................. 67

Page 1. DEPOSIT TYPES ......................................................................................................70 2. CARBONATE REPLACEMENT DEPOSITS................................................................................... 71 3. HIGH SULPHIDATION EPITHERMAL VEIN SYSTEMS................................................................. 72 iii Tintic Project April 25, 2024 8.2.1 8.2.2 Mineralized Structures at Trixie....................................................................................... 73 Trixie Gold - Tellurium Mineralization............................................................................... 76 8.2.3 Trixie T2 Structure: A Genetic Model for Mineralization ................................................. 77 8.3 PORPHYRY COPPER - GOLD POTENTIAL.................................................................................... 79 1. EXPLORATION........................................................................................................81 2. GENERAL INFORMATION........................................................................................................... 81 3. UNDERGROUND EXPLORATION ............................................................................................... 81 9.2.1 9.2.2 9.2.3 9.2.4 9.2.5 Underground Mapping..................................................................................................... 81 Underground Chip Sampling........................................................................................... 81 Chip Sample Collection Procedures................................................................................ 83 Chip Sample Location Procedures .................................................................................. 86 Trixie Underground 2022 - 2023 Chip Samples and Assays ............................................. 86 3. QP COMMENTS..................................................................................................................... ... .. 97 4. REGIONAL SURFACE EXPLORATION......................................................................................... 97 9.4.1 9.4.2 9.4.3 Program Details................................................................................................................ 97 Results, Analysis and Interpretations............................................................................ 100 Targeting and Exploration Potential ............................................................................. 110 1. DRILLING............................................................................................................. 113 2. DRILLING PROGRAM ............................................................................................................... 113 1. Underground Diamond Drilling ..................................................................................... 113 2. Surface RC Drilling.......................................................................................................... 113 3. Surface Diamond Drilling............................................................................................... 113 3. DRILLING METHODOLOGY ...................................................................................................... 113 1. Underground Diamond Drilling ..................................................................................... 113 2. Surface RC Drilling.......................................................................................................... 116 3. Surface Diamond Drilling............................................................................................... 116 4. Drilling Highlights and Results ...................................................................................... 116 4. ADDITIONAL DRILLING CONSIDERATIONS............................................................................. 122 5. DRILLING PROGRAM RECOMMENDATIONS............................................................................ 122 6. MICON QP COMMENTS ........................................................................................................... 123 7. SAMPLE PREPARATION, ANALYSES AND SECURITY ................................................... 124 8. INTRODUCTION................................................................................................................. ... ... 124 9. SAMPLE HANDLING AND SECURITY........................................................................................ 124 1. Underground Chip Sampling......................................................................................... 124 2. Drill Core Sampling ........................................................................................................ 124 3. Reverse Circulation Drill Chip Sampling ....................................................................... 125 10. ASSAY LABORATORIES ACCREDITATION AND CERTIFICATION ............................................. 125 1. ALS Laboratory............................................................................................................... 125 2. SGS Laboratory .............................................................................................................. 126 3. Tintic Laboratory............................................................................................................ 126

Page 4. SAMPLE PREPARATION AND ASSAYING ................................................................................. 126 1. ALS Sample Preparation ................................................................................................ 126 2. ALS Gold Assaying .......................................................................................................... 126 3. ALS Multi - Element Assaying .......................................................................................... 127 4. SGS Sample Preparation ............................................................................................... 127 5. SGS Gold Assaying.......................................................................................................... 127 6. SGS Multi - Element Assaying .......................................................................................... 128 7. Tintic Laboratory Sample Preparation.......................................................................... 128 8. Tintic Laboratory Gold and Silver Assaying .................................................................. 128 5. QUALITY ASSURANCE AND QUALITY CONTROL..................................................................... 129 1. Certified Reference Materials (Standards) .................................................................... 129 2. Blank Samples................................................................................................................ 133 3. Tintic Laboratory Sample Preparation Quality Assurance Measures .......................... 137 4. Tintic Laboratory Sample Analyses Quality Assurance Measures................................ 137 6. QP COMMENTS..................................................................................................................... ... 138 1. DATA VERIFICATION.............................................................................................. 139 2. GENERAL ............................................................................................................................. ... . 139 3. 2022 SITE VISIT........................................................................................................................ 139 1. QP Check Sampling, 2022 Site Visit ............................................................................... 140 4. 2024 SITE VISIT........................................................................................................................ 142 5. QP COMMENTS..................................................................................................................... ... 145 6. MINERAL PROCESSING AND METALLURGICAL TESTING ............................................. 146 7. MINERAL PROCESSING AND METALLURGICAL TESTING ....................................................... 146 8. SAMPLE PROVENANCE............................................................................................................ 146 9. METALLURGICAL TESTING...................................................................................................... 146 1. Metallurgical Sample Characterization......................................................................... 147 2. Mineralogy................................................................................................................... ... 149 3. Bottle Roll Leach Tests................................................................................................... 150 4. Gravity Separation Tests................................................................................................ 151 5. Comminution Tests........................................................................................................ 152 6. Additional Testwork....................................................................................................... 152 10. NOTES REGARDING METALLURGICAL LABORATORY CERTIFICATIONS ................................ 153 11. CONCLUSIONS AND RECOMMENDATIONS ............................................................................ 153 12. MINERAL RESOURCE ESTIMATES ............................................................................ 154 13. INTRODUCTION................................................................................................................. ... ... 154 14. CIM RESOURCE DEFINITIONS AND CLASSIFICATIONS........................................................... 154 15. CIM ESTIMATION OF MINERAL RESOURCES BEST PRACTICES GUIDELINES ........................ 156 16. METHODOLOGY.................................................................................................................. ... .. 156 17. RESOURCE DATABASE ............................................................................................................ 157 18. GEOLOGICAL MODEL .............................................................................................................. 157 19. GEOSTATISTICAL ANALYSIS.................................................................................................... 160 1. Compositing ................................................................................................................... 160 2. High Grade Capping ....................................................................................................... 160 iv Tintic Project April 25, 2024

Page 3. Density...................................................................................................................... ... ... 161 4. Variogram Analysis......................................................................................................... 163 5. Search Ellipse Parameters ............................................................................................. 163 8. BLOCK MODEL AND GRADE INTERPRETATION ...................................................................... 166 9. MODEL VALIDATION................................................................................................................ 167 1. Visual Inspection ............................................................................................................. 167 2. Statistical Comparisons................................................................................................. 167 3. Reconciliation ................................................................................................................ 171 10. MINERAL RESOURCE CLASSIFICATION .................................................................................. 171 11. REASONABLE PROSPECTS FOR EVENTUAL ECONOMIC EXTRACTION .................................. 172 12. MINED VOID DEPLETION......................................................................................................... 173 13. MINERAL RESOURCE ESTIMATE ............................................................................................. 173 14. MINERAL RESOURCE GRADE SENSITIVITY ANALYSIS............................................................. 173 15. FACTORS THAT COULD AFFECT THE MINERAL RESOURCE ESTIMATES ............................... 178 16. RESPONSIBILITY FOR THE TRIXIE MINERAL RESOURCE ESTIMATE ...................................... 179 15. MINERAL RESERVE ESTIMATES............................................................................... 180 16. MINING METHODS ................................................................................................ 180 17. RECOVERY METHODS ............................................................................................ 180 18. PROJECT INFRASTRUCTURE .................................................................................. 180 19. MARKET STUDIES AND CONTRACTS ........................................................................ 180 20. ENVIRONMENTAL STUDIES, PERMITTING, AND SOCIAL OR COMMUNITY IMPACT .......... 180 21. CAPITAL AND OPERATING COSTS............................................................................ 180 22. ECONOMIC ANALYSIS ............................................................................................ 180 23. ADJACENT PROPERTIES ........................................................................................ 181 1. FREEPORT MCMORAN............................................................................................................. 182 1. 1996 Historic Mineral Resources.................................................................................... 182 2. IVANHOE ELECTRIC................................................................................................................. 182 1. Property Description and Ownership............................................................................ 183 3. QP COMMENTS..................................................................................................................... ... 183 24. OTHER RELEVANT DATA AND INFORMATION ............................................................ 184 1. TRIXIE TEST MINE.................................................................................................................... 184 25. INTERPRETATIONS AND CONCLUSIONS................................................................... 186 1. GENERAL INFORMATION......................................................................................................... 186 2. TRIXIE MINERAL RESOURCE ESTIMATE.................................................................................. 186 1. Introduction ................................................................................................................... 186 2. Methodology .................................................................................................................. 186 v Tintic Project April 25, 2024

Page 3. Resource Database ........................................................................................................ 186 4. Geological Model............................................................................................................ 187 5. Geostatistical Analysis ................................................................................................... 187 6. Block Model and Grade Interpretation.......................................................................... 189 7. Model Validation ............................................................................................................ 189 8. Mineral Resource Classification..................................................................................... 189 9. Reasonable Prospects for Eventual Economic Extraction ........................................... 189 10. Mined Void Depletion..................................................................................................... 190 11. Trixie Mineral Resource Estimate Statement................................................................ 191 12. Mineral Resource Grade Sensitivity Analysis ................................................................ 193 3. RISKS AND OPPORTUNITIES .................................................................................................. 194 4. CONCLUSIONS ........................................................................................................................ 196 1. RECOMMENDATIONS ............................................................................................ 197 2. EXPLORATION BUDGET AND OTHER EXPENDITURES ........................................................... 197 3. FURTHER RECOMMENDATIONS ............................................................................................. 198 27. DATE AND SIGNITURE PAGE ................................................................................... 200 28. REFERENCES........................................................................................................ 201 1. GENERAL PUBLICATION AND REPORT REFERENCES ............................................................ 201 2. WEBSITE REFERENCES ........................................................................................................... 204 29. CERTIFICATES OF QUALIFIED PERSONS (AUTHORS).................................................. 205 Appendices APPENDIX 1: Glossary of Mining and Other Related Terms ...................................... End of the report APPENDIX 2: Tintic Project Properties and Mineral Rights ........................................... End of the report vi Tintic Project April 25, 2024

Page List of Tables Resource Cut - Off Grade Parameters .................................................................................... 19 Trixie Deposit Mineral Resource Estimate (MRE) Statement .............................................. 21 vii Tintic Project April 25, 2024 Table 1.1 Table 1.2 Table 1.3 Gold Grade Sensitivity Analysis at Different Cut - Off Grades ............................................... 22 Table 1.4 Risks and Opportunities at the Trixie Project ...................................................................... 24 Table 1.5 Tintic Project, Recommended Budget for Further Work, Phase 1 (USD)............................ 25 Table 1.6 Table 2.1 Table 2.2 Tintic Project, Recommended Budget for Further Work Phase, 2 (USD)............................ 26 Qualified Persons, Areas of Responsibility and Site Visits................................................... 30 Conversion Factors for this Report....................................................................................... 31 Table 2.3 List of Abbreviations ............................................................................................................. 31 Table 4.1 Trixie Mineral Claims............................................................................................................. 41 Table 4.2 Table 6.1 Table 6.2 Table 9.1 Burgin Mineral Claims........................................................................................................... 42 Total Recovered Metal and Production Values from the Tintic District.............................. 52 Trixie Mine Historic Production Summary ........................................................................... 55 Select 2022 and 2023 Trixie Underground Chip Sequence Sample Assay Composites ..... 92 Table 10.1 2022 Surface RC Drilling Assay Highlights.......................................................................... 117 Table 10.2 2022 and 2023 Underground Diamond Drilling Assay Highlights ..................................... 118 Table 11.1 Table 11.2 Table 11.3 ALS Results of Standards used by TCM for the 2022 Drilling Programs............................ 130 SGS Results of Standards used by TCM for the 2023 Drilling Programs ........................... 131 Tintic Lab Results of Standards used by TCM for the 2022 and 2023 Chip Sampling Programs..................................................................................................................... ... ...... 133 Table 11.4 ALS Au - AA26 Results of Blanks used by TCM for the 2022 Drilling Programs ................... 134 Table 11.5 ALS ME - GRA22 Results of Blanks used by TCM for the 2022 Drilling Programs ................ 135 Table 11.6 Table 11.7 SGS Results of Blanks used by TCM for the 2023 Drilling Programs ................................. 136 Tintic Lab Results of Blanks used by TCM for the 2022 and 2023 Chip Sampling Programs..................................................................................................................... ... ...... 136

Page Table 12.1 viii Tintic Project April 25, 2024 Underground Reject Face Chip Samples Selected for Secondary Assaying during the 2022 Site Visit........................................................................................................................ ... ..... 141 Table 13.1 Metallurgical Composite Sample Average Head Gold and Silver Analyses ...................... 147 Table 13.2 Metallurgical Composite Selected Multi - Element Analyses.............................................. 147 Table 13.3 Table 13.4 Table 13.5 Metallurgical Composite Whole Rock Analyses ................................................................. 148 Summary of QEMSCAN Results .......................................................................................... 149 Summary of Diagnostic Leach Test Results ....................................................................... 150 Table 13.6 Summary of T2 Direct Bottle Roll Leach Test Results ....................................................... 151 Table 13.7 Summary of T4 Direct Bottle Roll Leach Test Results ....................................................... 151 Table 13.8 Summary of T2 Gravity and Gravity Tails Leach Test Results ........................................... 152 Table 13.9 Table 14.1 Table 14.2 Summary of Comminution Test Results ............................................................................ 152 Top Capping Grades for Gold and Silver ............................................................................ 160 Sample Statistics for Gold and Silver for Raw Samples, Capped Composites and Uncapped Composites ........................................................................................................ 161 Table 14.3 Bulk Density Values Used for the Mineralized Domains of the Trixie Deposit .................. 162 Table 14.4 Table 14.5 Table 14.6 Table 14.7 Variogram Models for Gold and Silver for each Mineralized Domain ............................... 164 Estimation Parameters used for each Mineralized Domain .............................................. 166 Summary of the Block Model Characteristics.................................................................... 167 Global Bias Analysis Between the Interpolation Methods ................................................ 169 Table 14.8 Local Reconciliations of Underground Development Data with the Resource Model..... 171 Table 14.9 Resource Cut - Off Grade Parameters .................................................................................. 172 Table 14.10 Trixie Deposit Mineral Resource Estimate (MRE) Statement ............................................ 175 Table 14.11 Gold Grade Sensitivity Analysis at Different Cut - Off Grades ............................................. 176 Table 24.1 Table 25.1 Trixie Test Mine Key Operating Details .............................................................................. 184 Resource Cut - Off Grade Parameters .................................................................................. 190 Table 25.2 Trixie Deposit Mineral Resource Estimate (MRE) Statement ............................................ 192

Page Table 25.3 Table 25.4 ix Tintic Project April 25, 2024 Gold Grade Sensitivity Analysis at Different Cut - Off Grades ............................................. 193 Risks and Opportunities at the Trixie Project .................................................................... 195 Table 26.1 Tintic Project, Recommended Budget for Further Work, Phase 1 (USD).......................... 197 Table 26.2 Tintic Project, Recommended Budget for Further Work, Phase 2 (US$) .......................... 197

Page List of Figures Location Map for the Tintic Project...................................................................................... 35 TCM Property Outline within the East Tintic District........................................................... 37 x Tintic Project April 25, 2024 Figure 4.1 Figure 4.2 Figure 4.3 Tintic Project Individual Claims Map.................................................................................... 38 Figure 4.4 Tintic Project Surface Ownership......................................................................................... 39 Figure 4.5 Tintic Project Net Smelter and Milling Royalty Purchase.................................................... 40 Figure 5.1 Figure 5.2 Figure 6.1 Overview of the Trixie Test Mine looking towards the Northeast ....................................... 45 Burgin Site Infrastructure ..................................................................................................... 47 Overview of the Major Historic Mineral Deposits of the Tintic District ............................... 49 Figure 6.2 Trixie Headframe .................................................................................................................. 56 Figure 6.3 Cross - Section, Looking North, of the Surface RC Hole Intersections that Led to Discovery of the T2 Structure................................................................................................................. 57 An Early Mining Face on the T2 Structure Looking North.................................................... 58 Overview Map of the Southern End of 625 ft Level .............................................................. 59 Map of the Tintic District Displaying Mineral Occurrences and Regional Tectonic Framework.................................................................................................................... ... ...... 61 Figure 6.4 Figure 6.5 Figure 7.1 Figure 7.2 Palaeozoic Stratigraphy of the Tintic District ...................................................................... 62 Figure 7.3 Figure 7.4 Partial N - Facing 7.5’ Eureka Quadrangle Section A - A’ ........................................................ 64 Oligocene Volcano - Magmatic Stratigraphy of the Tintic District with Select Reported Geochronologic Data............................................................................................................. 65 Simplified USGS Geologic Map of the East Tintic District ................................................... 66 Figure 7.5 Figure 7.6 East - Facing Geological Long Section Displaying Underground Development at Trixie .... 69 Figure 8.1 Generalized Model of Deposit Styles in the East Tintic District .......................................... 70 Figure 8.2 CRD - Style Base - Metal Mineralization, Massive Galena Typical of the Historic Burgin, Tintic Standard and North Lily Mines ................................................................................... 71 Typical Sulphide Au - Ag - Rich Vein Mineralization found at Trixie and in the Historic Eureka Standard Mine, Hand Sample taken from the Eureka Standard Dump Pile ....................... 72 Figure 8.3

Page Figure 8.4 xi Tintic Project April 25, 2024 North Facing Geological Cross - Section displaying Mineralized Domains and Controlling Structures at Trixie ................................................................................................................ 74 Figure 8.5 Schematic Section of Mineralization and Alteration Associated with the T2 Structure .... 76 Figure 8.6 Left: Hand Sample from the T2 Structure; Right: Hand Sample from the T4 Stockwork Zone ............................................................................................................................. ... ....... 77 Thin Sections from the T2 Structure .................................................................................... 78 Mapped Lithological Caps Relative to Known Deposits ...................................................... 80 Figure 8.7 Figure 8.8 Figure 9.1 Example of an Underground Map Sheet .............................................................................. 82 Figure 9.2 Schematic illustrating the Three Classifications of Chip Sample Sequences Underground at Trixie....................................................................................................................... ... ......... 83 Figure 9.3 Figure 9.4 Figure 9.5 Example of a Chip Sampling Sketch and Data Sheet, CH1317............................................ 84 Post - Sampling Face Photo of Site CH1317 .......................................................................... 85 Trixie Long - Section Displaying New Development and Chip Sequence Sample Assay Map/Section Location Traces................................................................................................ 87 Figure 9.6 Trixie Chip Sequence Assay Map, 665 Sublevel (Eileen Drift) and Ramp Development..... 88 Figure 9.7 Figure 9.8 Figure 9.9 Figure 9.10 Trixie Chip Sequence Assay Map, Sill 4 Development Cut................................................... 89 Trixie Chip Sequence Assay Map, Sill 5 Development and Exploration Cuts...................... 90 Trixie Chip Sequence Assay Map, Raise 1 Pillar Cut 1 .......................................................... 91 3D Leapfrog Model of the East Tintic District Exploded Along Major Fault Boundaries .... 98 Figure 9.11 Left: Relationship of two phases of pebble dike with clast rich phase in the centre and matrix rich phase on the peripheries. Right: Rounded clast of an early pebble dike which was incorporated into a later phase dike showing characteristic onion skin spalling pattern. ............................................................................................................................. ... 100 Updated Regional Alteration Map of the East Tintic District............................................. 103 Location Map of the 2023 Dump Samples ......................................................................... 105 Figure 9.12 Figure 9.13 Figure 9.14 Geographic Zones Selected for Breccia and Gossan Sample Analysis ............................. 107 Figure 9.15 Average Values of Commodities of Interest from Breccia Samples within Each of the Geographically Defined Zones ............................................................................................ 108

Page Figure 9.16 xii Tintic Project April 25, 2024 Location Map of Porphyry Samples and Subdivision of Intrusive Centres Used for Analysis ............................................................................................................................. ... 109 Figure 9.17 From Cohen (2011) Showing the Relative Position and Scale of Geochemical Variations Associated with the Ann Mason Porphyry Copper Deposit, Nevada. ................................ 110 Figure 9.18 Regional Prospectivity and Target Heat Map Showing Areas of Greatest Overlap in Favourable Characteristics in Hotter Colours .................................................................... 111 Left: Fifteen Primary Targets Identified Over Areas of Greatest Overlap in Prospectivity. Right: Ten Secondary Targets with Smaller Footprints and Less Overlap in Prospectivity ........................................................................................................................ 112 Figure 9.19 Figure 10.1 2023 Underground Diamond Drill Hole Collar Locations .................................................. 114 Figure 10.2 Figure 10.3 Figure 10.4 Figure 10.5 Surface RC Drill Locations .................................................................................................. 115 Surface Drill Rig at Big HIll .................................................................................................. 117 2023 Underground Diamond Drilling with Assays on Section 23280 N. Looking North... 120 Underground Diamond Drilling with Assays on Section 23000 N. Looking North............ 121 Figure 10.6 Trixie Target Areas (Looking East)...................................................................................... 123 Figure 11.1 Figure 11.2 Figure 11.3 Example of ALS Results for Standard OREAS 234 for the 2022 Drill Programs................. 131 Example of SGS Results for Standard OREAS 234 for the 2023 Drill Programs ................ 132 Example of Tintic Lab Results for Standard OREAS 298 for the 2022 and 2023 Chip Sampling Programs ............................................................................................................. 133 Figure 11.4 ALS Results of Blanks for the 2022 Drilling Programs........................................................ 134 Figure 11.5 ALS ME - GRA22 Results of Blanks for the 2022 Drilling Programs...................................... 135 Figure 11.6 SGS Results of Blanks for the 2023 Drilling Programs ....................................................... 136 Figure 11.7 Figure 12.1 Figure 12.2 Tintic Lab Results of Blanks for the 2022 and 2023 Chip Sampling Programs ................. 137 Trixie Headframe showing the Cage to Access Underground........................................... 140 Underground Drill Setup on Drill Hole CHQ 1683 .............................................................. 143 Figure 12.3 Mineralized 45 Fault Zone .................................................................................................. 143 Figure 12.4 Exploration Cross - Cut 3 ...................................................................................................... 144

Page Figure 12.5 Figure 14.1 xiii Tintic Project April 25, 2024 Returning to Surface the Underground Decline ................................................................ 144 Plan View (left) and Orthogonal View Looking Northwest (right) of the Trixie Drill Hole and Chip Sample Database ................................................................................................. 157 Figure 14.2 Vertical Section View of the Trixie Geological and Resource Domain Wireframes Looking North ............................................................................................................................. ... .... 158 Example of Experimental and Modelled Variogram (Correlogram) for Gold in the T2 Domain....................................................................................................................... ... ....... 165 Figure 14.3 Figure 14.4 Visual Model Validation Comparison of Block Grades with Raw Sample Grades; Left: Plan View at 5,432 +/ - 1.5 m; ........................................................................................................ 168 Figure 14.5 Statistical Model Validation; Swath Plots in the Three Principal Orientations and the Gold Grade Histogram, Comparing Declustered Sample Grades with the Estimated Model Grades (Example from the T2 Domain)............................................................................... 170 Vertical Long Section Looking East at the Current Development Voids and Historical Buffers, Used to Deplete the Trixie Mineral Resources...................................................... 174 Figure 14.6 Figure 14.7 Grade Tonnage Curves Indicating the Sensitivity of the Measured and Indicated Mineral Resources at Different Cut - Off Grades ................................................................................ 177 Grade Tonnage Curves Indicating the Sensitivity of the Inferred Mineral Resources at Different Cut - Off Grades ...................................................................................................... 178 Map of Adjacent Property Land Holders ............................................................................ 181 Figure 14.8 Figure 23.1 Figure 24.1 Trixie Test Mine Long Section Looking West...................................................................... 185

Osisko Development Corp. 1. SUMMARY 2. G ENERAL Osisko Development Corp . (Osisko Development) has retained Micon International Limited (Micon) to independently review and verify its mineral resource estimate (MRE) for the Trixie deposit located within the boundaries of its Tintic Project (the Project) in the State of Utah, USA, and to compile a Canadian National Instrument (NI) 43 - 101 Technical Report disclosing the results of the MRE . The MRE was completed by Osisko Development’s chief resource geologist, Daniel Downton, P . Geo . , using Datamine Studio software . The MRE was then reviewed and validated by William Lewis, P . Geo . and Alan San Martin, MAusIMM(CP), of Micon . William Lewis, P . Geo . , who is independent of Osisko Development and is a Qualified Person (QP) within the meaning of NI 43 - 101 , is responsible for the mineral resource estimate disclosed in this report, by virtue of his independent review and validation of the work conducted by Osisko Development . A site visit was conducted from February 5 to February 8 , 2024 , by Mr . Lewis to independently verify the geology, mineralogy, drilling program results and the Quality Assurance/Quality Control (QA/QC) programs at the Tintic Project . The February, 2024 , site visit was the second site visit to the Tintic Project by Mr . Lewis . When conducting, reviewing and validating the mineral resource estimate, Osisko Development and Micon’s QPs used the following guidelines, published by the Canadian Institute of Mining, Metallurgy and Petroleum (CIM) : 1. The CIM Definitions and Standards for Mineral Resources and Reserves, adopted by the CIM council on May 10 , 2014 . 2. The CIM Estimation of Mineral Resources and Mineral Reserves Best Practice Guidelines, adopted by the CIM Council on November 29 , 2019 . This report discloses technical information, the presentation of which requires the QPs to derive sub - totals, totals and weighted averages that inherently involve a degree of rounding and, consequently, introduce a margin of error . Where these occur, the QPs do not consider them to be material . The conclusions and recommendations of this report reflect the QPs best independent judgment in light of the information available to them at the time of writing . Micon and the QPs reserve the right, but will not be obliged, to revise this report and conclusions if additional information becomes known to them subsequent to the date of this report . Use of this report acknowledges acceptance of the foregoing conditions . This report is intended to be used by Osisko Development subject to the terms and conditions of its agreement with Micon . That agreement permits Osisko Development to file this report as a Technical Report on SEDAR ( www . sedar . com ) pursuant to provincial securities legislation, or with the Securities and Exchange Commission (SEC) in the United States . 1 Tintic Project April 25, 2024

Osisko Development Corp. Neither Micon nor the individual QPs have, nor have they previously had, any material interest in Osisko Development or related entities . The relationship with Osisko Development is solely a professional association between the client and the independent consultants . This report is prepared in return for fees based upon agreed commercial rates and the payment of these fees is in no way contingent on the results of this report . Micon and the QPs are pleased to acknowledge the helpful cooperation of Osisko Development management, personnel and consulting field staff, all of whom made any and all data requested available and responded openly and helpfully to all questions, queries and requests for material . This report supersedes and replaces all prior Technical Reports written for the Tintic Project . 1.2 P ROPERTY L OCATION , D ESCRIPTION AND O WNERSHIP The Tintic Project is located in western Utah County, approximately 64 kilometres (km) south of Provo, Utah and 95 kilometres south of Salt Lake City . The property on which the Trixie test mine or Trixie deposit is located encompasses most of the East Tintic District, surrounding and immediately east of the incorporated town of Eureka . The township of Eureka is located approximately 6 . 4 km northwest of the Trixie test mine . The coordinates of the centre of the Project are 407 , 700 mE and 4 , 423 , 400 mN, referenced in NAD 83 , Northern UTM Zone 12 . The Project area is located on Eureka Quadrangle, US Topographic Map 1 : 24 , 000 scale, 7 . 5 Minute Series . The nearest rail siding, in use, is located at Tintic Junction, approximately 10 km west of the Project . The area of the Tintic Project owned or controlled by Osisko Development comprises 1 , 370 claims totalling 7 , 601 . 32 ha ( 18 , 783 . 246 acres) of patented mining claims and a further 110 unpatented mining claims of approximately 731 . 41 ha ( 1 , 807 . 346 acres) . Osisko Development leases or owns a small and varying percentage interest or royalty in several other claims outside the main claim package . On May 30 , 2022 , Osisko Development announced the acquisition of 100 % of Tintic Consolidated Metals LLC (TCM) (the “ Acquisition ”) from IG Tintic LLC (IG Tintic) and Chief Consolidated Mining Co . (CCMC) (the “ Vendors ”) for total consideration at closing of approximately USD 177 million in cash and shares of Osisko and : 2 Tintic Project April 25, 2024 iii. i. USD 12.5 million in deferred payments ii. Two 1% NSR royalties, each with a 50% buyback right in favour of Osisko Development exercisable within 5 years; and other contingent payments, rights and obligations. 1.3 A CCESSIBILITY , C LIMATE , P HYSIOGRAPHY , L OCAL R ESOURCES AND I NFRASTRUCTURE The closest major airport to the Tintic Project is in Salt Lake City, Utah (UT), located to the north - northwest of the city of Provo, UT via Interstate 15 . Access to the Tintic Project from Provo is via Interstate 15 , a distance of 36 km south to exit 248 to US 6 , then west on US 6 , 27 km to Silver Pass Road,

Osisko Development Corp. and then south 3 . 2 km to the Burgin project office site . The Trixie test mine is located 2 . 6 km southwest of the Burgin office on the paved Silver Pass Access Road . Provo and other smaller towns, including Payson, Santaquin and Eureka, are also adjacent to the Project . The towns of Goshen, Santaquin, Payson and Provo are the main sources for supplies and services . Tintic Project personnel and contractors also live in these areas . The Project has sufficient power and water to support a mining operation . Topographic relief in the East Tintic District ranges from 1 , 494 metres (m) in the Goshen Valley east of the District to 1 , 996 m at nearby Mineral Hill . The elevation at Trixie is 1 , 852 m . The Tintic Mountains host the scanty vegetation typical of an arid region . Different species of cactus, forbs and shrubs grow on exposed rocky points . The more common trees of the higher slopes are pinyon pine, juniper and mountain mahogany . At lower elevations, maple thickets occur in the dry ravines, especially on the eastern slopes, while aspens are found in sheltered spots, more commonly those of northern exposure . In the valleys, sagebrush, rabbitbrush, Brigham’s tea and cheat grass constitute almost the entire vegetation . Range improvement projects in the area have had some effect on improving grazing . The climate of the East Tintic District is semi - arid . The U . S . Climate data website notes that the mean monthly low temperatures at the nearby town of Elberta range from - 10 Σ Celsius (C) ( 15 Σ Fahrenheit (F)) in January to 15 Σ C ( 58 Σ F) in July . The mean monthly high temperatures range from 2 Σ C ( 37 Σ F) in January to 33 Σ C ( 93 Σ F) in July . The Project has year - round access and operating season . The Project’s main office, laboratory, workshops and onsite processing facilities are located at the Burgin site, immediately off Highway 6 and northeast of the Trixie test mine . The Burgin mine is a past - producing underground operation that was last mined in 1976 . All references to Burgin in this report are with respect to the main office and surface facilities located at this site, and not to the Trixie test mine or deposit, unless otherwise specified . A mill facility, previously operational in 2002 , is located at the Burgin site . In October, 2021 , a pilot vat leaching circuit was established within the old Burgin mill facility for the recovery of gold and silver from the mineralized material from the Trixie test mine . Osisko Development’s recent operations have also included trucking mineralized material to an offsite facility for vat and heap leaching . This activity occurred from late 2020 up to May, 2022 . Test milling designs in the Burgin mill building have been considered through 2023 to further demonstrate the leach recovery results from the pilot vat leach facility in operation through late 2022 . There is a tailings facility north of the processing facilities which is intended to support tailings storage for a potential future Burgin Test Mill . Both pilot milling facilities and pilot heap leach facilities have been considered to further demonstrate the leach recovery results observed in the pilot vat leach facility in operation through late 2023 . There is a separate dry stack facility designed and in permit review to the north of the processing facilities which is intended to handle finely comminuted tailings, such as those from a milling process . Current efforts are primarily focused on developing the heap leach plan, including the above - mentioned re - permitting, and engineering of peripheral components of the heap leach facility . 3 Tintic Project April 25, 2024

Osisko Development Corp. The onsite laboratory at the Burgin site provides fire assay analysis for gold and silver for all underground grade control sampling from the Trixie test mine . Atomic Absorption Spectrometry (AAS) and bottle roll analysis to complement onsite VAT leaching and processing have also been established . Using an onsite laboratory to assay samples generated on site is common practice in the mining industry . Onsite laboratories usually participate in round robin exercises with government or independent laboratories as part of their Quality Assurance and Quality Control programs . In addition, onsite laboratories, such as the Burgin site, usually send out check samples and engage laboratory auditing consultants to independently review their procedures . The mineral property is sufficiently large that construction of further infrastructure at the Project will not be hindered by lack of space . 4. H ISTORY 1. Tintic District – Early Mining History (1869 to 2002) Economic mineralization in the Tintic District was first discovered in 1869 and, within a few years, most of the major near surface ore bodies were being mined and many of the historic mining towns, including Diamond, Silver City, Mammoth, Eureka, Dividend and Knightsville had been established . By 1899 , the Tintic District had become one of the richest mining districts in the USA . Active mining in the district continued through the 20 th and the beginning of the 21 st century . 1. East Tintic District Even though many claims in what is now identified as the East Tintic District had been staked before the turn of the 20 th century, the only known occurrence of surface mineralization was in a small outcrop near the present Eureka Lilly shaft . All future discoveries of the blind ore bodies in the East Tintic District have been based on surface alteration and underground geological interpretation . E . J . Raddatz became interested in the East Tintic District around 1906 and acquired a major holding in what is now the Tintic Standard area . Raddatz reasoned that, even though the surface rocks were inhospitable, there was a chance of discovery in the Ophir limestone at depth . It took a considerable amount of time, two shafts and thousands of feet (ft) of drift and winze workings but, in 1916 , the Tintic Standard deposit was discovered and went on to become one of the major lead - silver mines in the world . Mining geologists, attracted by the discovery of the Tintic Standard deposit, began to study the district . Based on these studies, a long drive on the 700 level of the Tintic Standard mine was commissioned . This exploration work intersected the mineral deposit that became the North Lily mine . Similar strategies led to the discovery of the Eureka Standard mine . During World War II, the United States recognized that, in the event of a long war, new sources of raw material would be essential . As a result, the US Geological Survey undertook an exploration program seeking blind ore bodies in the East Tintic District . One of the blind targets identified by the USGS was the CCMC oxide area, a prominent outcrop of oxidized and pyritized volcanics which overlies the Burgin deposit . However, no major discovery was made from either the sinking of the 22 . 6 m ( 75 ft) deep CCMC 4 Tintic Project April 25, 2024

Osisko Development Corp. shaft or the drift from the Apex Standard mine . It was later surface drilling that made the discovery of the Burgin ore body . District production slowly increased through discovery of new mines and peaked between 1921 and 1930 . From that peak, production decreased to a low between 1961 and 1970 . Production from the Burgin mine led to a second peak of between 1971 and 1976 . 2. Trixie – Exploration Underground Development and Mining (1927 to 1995) 1. Trixie Early Exploration (Pre - 1957) Following the discovery of the Tintic Standard deposit in 1917 , the North Lily deposit in 1927 and the Eureka Standard deposit in 1928 , interest was sparked over a poorly exposed structure overlying the current location of the Trixie test mine . Intense hydrothermal alteration of volcanic rocks exposed at surface at the Trixie site attracted the attention of the U . S . Bureau of Mines which, in 1946 - 1947 , conducted a number of studies in the Trixie area . During 1954 - 1955 the USGS conducted sampling and mapping of the area immediately north of the current Trixie shaft location . This was followed up by the drilling that confirmed the presence of the Trixie fault and the validity of the surface anomalies when low - grade lead - zinc ore was intersected in the Trixie fault zone . After the conclusion of the USGS research program in 1956 , Bear Creek Mining completed additional holes in the target area and several of these holes intersected strong lead - zinc replacement mineralization in the underlying limestone . Despite the apparent presence of ore - grade mineralization at depth, the disappointing core recoveries resulted in surface exploration work being terminated in 1957 . Subsequently, the decision was made to conduct future exploration from underground . 2. Trixie - Shaft Sinking and Underground Development and Mining (1968 to 1992) The sinking of the Trixie shaft was initiated in 1968 and had reached the 750 ft level by 1969 . Although the initial target of exploration at the Trixie historic mine was lead - zinc replacement mineralization in the hanging wall of the Trixie Fault, a gold - bearing structure was encountered during shaft sinking . This northerly - trending and steeply west - dipping structural zone became the primary source of ore, which was concentrated along three gold - silver mineralized shoots referred to as the 756 ore shoot, the 75 - 85 ore shoot, and the Survey zone . The original carbonate replacement deposit (CRD) that was discovered at the Trixie historic mine in 1969 is located on the north end of the deposit within the downthrown carbonate sequence north of the Trixie fault . While limited in scale, the replacement mineralization consists of massive sulphide minerals and jasperoid between the 750 ft level and 900 ft level . The 756 ore shoot represents the most productive of the three historically mined ore zones . This ore shoot plunges to the north, towards the Trixie and Eureka Standard faults and was mined continuously from approximately 75 ft above the 625 level to below the deepest 1350 level development . Based on limited historic drilling it remains open at depth . 5 Tintic Project April 25, 2024

Osisko Development Corp. In 1976 , as mining and exploration continued within the 756 ore shoot, the 75 - 85 ore shoot was discovered approximately 1 , 600 ft ( 488 m) south of the Trixie shaft . The 75 - 85 ore shoot was mined from approximately 50 ft ( 15 m) above the 625 level down to the 1200 level . In early 1980 , Bear Creek Mining discovered the Survey zone while exploring for the Sioux - Ajax fault by drifting south on the 1050 ft level of the Trixie historic mine . The Survey vein segment was explored and extensively developed by Kennecott on the 750 , 900 , 1050 and 1200 levels during the pre - 1995 silica flux mining periods . The southern end of the Survey Vein is extended for a distance of 3 , 400 ft south of the main shaft along the 1050 level and it remains open to the south and at depth . In 1980 , Sunshine Mining Corporation leased the Burgin unit from CCMC and, by 1983 , had also begun work at Trixie where it re - started mining operations and undertook additional underground development and diamond drilling . Much of the underground development and drilling from this time appears to have been focused on the 900 , 1050 , 1200 and 1350 levels . Perhaps the most notable exploration efforts at Trixie during this time were the southerly extensions of the 900 , 1050 and 1200 ft level drifts, following the discovery of the Survey zone, and the northeastward extension from the 1350 ft level to connect with the 1100 ft level of the Eureka Standard mine . This connection provided the underground access needed to evaluate the Eureka Standard fault along - strike and down - dip from the original Eureka Standard mine workings . Sunshine operated the Trixie historic mine until terminating its lease with CCMC at the end of 1992 . 3. Trixie Exploration and Production (2000 to 2002) Between 2000 and 2002 , CCMC (through its affiliate Tintic Utah Metals LLC) undertook an aggressive surface and underground drilling program at Trixie, resulting in the discovery of a small - tonnage gold - silver resource associated with the earlier mined 75 - 85 mineralized zone . The 625 ft level was developed within the mine in 2001 , but mining was suspended due to the decrease in the price of gold below $ 300 /oz and CCMC’s financial and reported management problems . 4. Trixie Exploration and Production (2019 to 2021) 1. TCM – Trixie, Modern Target Generation (2019 to 2020) TCM acquired the historical Trixie mine at the beginning of 2019 , and initially focused its assessment on the base - metal resource opportunity at the Burgin mine . However, high - grade gold opportunities that had potential for near - term production and revenue at Trixie quickly became the focus of the company . Since most of the historic mining was concentrated on the steep west - dipping structural corridor with very little development or exploration into either the footwall or hanging wall, there was high potential to define additional mineralized structures in close proximity to the existing underground infrastructure . In August, 2019 , TCM made the decision to commence rehabilitation of the historic mine and shaft, with the intention of beginning underground drilling and exploration of documented targets on the historic 625 ft and 750 ft development levels . 6 Tintic Project April 25, 2024

Osisko Development Corp. By December, 2019 , TCM had compiled the historic Trixie datasets into a new 3 D model of the deposit and had identified a significant new target in the immediate footwall to the 610 stope . This new target, initially termed the North Survey Vein, was developed from reconsidering assays within historic surface RC holes which could not have originated from any of the historically mined areas . Further investigation of this target led to the discovery of the T 2 and T 4 structures . The broad zones of mineralization encountered in the 2000 - 2001 surface RC drilling were originally interpreted to be caused by the smearing of mineralization within the holes . However, 2021 exploration work by TCM demonstrated that mineralization up to 60 ft in width is associated with the T 4 stockwork . The broad zones of mineralization encountered in the 2000 - 2001 RC drilling were thus re - interpreted as intercepts of T 2 - T 4 stockwork mineralization in the immediate footwall of the 75 - 85 structure . 2. TCM T2 Discovery (2020 to 2021) Between February and June, 2020 , refurbishment of the 625 level was completed and this allowed for the commencement of underground diamond drilling . A total of five diamond drill holes were completed between June and August, 2020 . Despite extremely difficult drilling conditions, visible mineralization within the footwall of the 610 stope was confirmed in three of the five holes . With the visual confirmation of the mineralization and structure, a decision was made by TCM management to commence development of an exploration drift eastward towards the target zone . The decision to develop into the target zone proved extremely fortuitous, as only 13 m ( 44 ft) east of the historic 625 ft level development, TCM drifted directly into the T 2 structure . Abundant visible gold associated with the striking green colour of the mineralized zone aided the visual identification and test mining of the T 2 structure . Initial test mining continued north and south on - strike of the steeply east dipping structure to determine potential strike lengths of the mineralized zone . At the same time, the original 609 exploration cross - cut was extended further eastward to test ground immediately east of the T 2 structure for further mineralization . Together with additional diamond drilling and exploration cross - cuts, a broad zone of mineralized stockwork veining up to 25 m ( 80 ft) in width was identified, and this is referred to as the T 4 stockwork zone of mineralization . 3. TCM Underground Development and Mineral Processing (2020 to 2021) In November, 2020 , the first shipment of mineralized material was shipped to an offsite processing facility and the first gold was poured by TCM . Continual underground development and drilling through 2021 helped define T 2 mineralization over a 120 m ( 400 ft) strike length and led to the recognition of the scale of the T 4 stockwork mineralization . Design work for a surface portal and internal decline ramp to access the Trixie underground development was commenced shortly thereafter . A geological model for T 2 - T 4 mineralization identified the potential significance of the overlying Ophir Shale, as a cap above the Tintic Quartzite host rock, in influencing the T 2 - T 4 mineralized zone . In the fall of 2021 , the Burgin processing facility was equipped with an onsite vat leaching facility . On May 30 , 2022 , Osisko Development announced the completion of its acquisition of TCM . 7 Tintic Project April 25, 2024

Osisko Development Corp. 5. G EOLOGICAL S ETTING AND M INERALIZATION 1. Geological Setting The Tintic Project is located within the historic Tintic mining district, a cluster of base and precious metal deposits covering more than 200 square kilometres (km 2 ) (or approximately 80 square miles) within the East Tintic Mountains of north - central Utah . The district is centred approximately 90 km ( 56 miles) south - southwest of Salt Lake City and 65 km ( 40 miles) south of the Bingham Canyon porphyry Cu - Au - Mo deposit . The East Tintic Mountains occupy a position within the Late Cretaceous Sevier fold and thrust belt approximately 30 km ( 20 miles) from the eastern limit of the Basin and Range extensional province, as defined by the surface expression of the Wasatch fault . District mineralization is associated with a post - Sevier compression and pre - Basin and Range extension period of magmatism spanning ca . 27 - 35 Ma (latest Eocene to Oligocene) . Commonly divided into Main, East, North and Southwest subdistricts, the greater Tintic is collectively the second largest metal producing district in Utah state, with Bingham first and Park City a close third . The core Tintic Project area covers more than 90 % of known deposits within the East Tintic subdistrict . Additional coverage extends north, west, and south into the North, Main and Southwest districts, respectively . 2. District Geology The geology of the Tintic district can be summarized as the record of four major phases of geologic evolution . These are 1 ) development of a Palaeozoic platformal sequence atop previously deformed Precambrian basement, 2 ) folding, faulting and uplift accommodating east - west shortening during the Late Cretaceous Sevier Orogeny, 3 ) latest Eocene to Oligocene calc - alkaline magmatism associated with district mineralization, and 4 ) Miocene to recent Basin and Range extension . Accommodation of east - west shortening during Late Cretaceous Sevier Orogeny resulted in the development of the district scale Tintic syncline - East Tintic anticline fold pair, and several associated district - scale generally west - vergent thrusts . The geometry of the sub - horizontal roughly north - south trending fold pair is responsible for the general basement architecture of the Tintic district, wherein the youngest (Mississippian) rocks of the Palaeozoic sequence are preserved along the trough of the Tintic syncline in the Main district and the Tintic Quartzite is present at its highest structural levels along the crest of the East Tintic anticline in the East district . High - angle structures developed in relation to the Sevier orogeny include a system of predominantly northeast trending faults, with strike - slip offset interpreted as accommodating differential displacement syn - compression, and a system of variably oriented normal faults developed in accommodation of late to post - orogenic gravitational collapse . Extensive erosion following Sevier uplift resulted in the development of a rugged paleo - topography by the onset of district magmatism ca . 35 Ma . The latest Eocene to Oligocene magmatic record consists of a quartz latite flow and tuff dominant sequence of irregular thickness up to 1 , 500 m ( 5 , 000 ft), with cross cutting to coeval locally porphyritic monzonite to quartz monzonite intrusions of varying geometries . District mineralization, dated in the East Tintic at around 31 Ma, is contemporaneous and associated . In the East Tintic district, known fissure - vein and replacement deposits are nearly exclusively buried beneath the irregular volcanic cover . While the basal (pre - mineral) volcanic cover hosts no significant mineralization, it is commonly characterized by significant hydrothermal alteration . Several sub - km - scale lithocaps point to potential porphyry targets at depth, where more localized alteration along 8 Tintic Project April 25, 2024

Osisko Development Corp. predominantly north to northeast - trending fissures with associated pebble dikes were used in successful targeting of many of the known historic deposits . The Palaeozoic sequence and its irregular volcanic cover are disrupted by Basin and Range extensional faulting . Miocene - age volcanics likely mark the onset of extension in the district ca . 16 - 18 Ma . While any pre - existing fault structures are likely primed for some degree of Basin and Range extensional reactivation, the most significant normal offsets occur along roughly north - south trending structures, e . g . , the district - scale Eureka Lilly fault . The variably north - south striking and west - dipping Eureka Lilly fault forms a major aquitard through the East Tintic district, dividing a fresh, cool - water - table in its hanging - wall to the west from a hot and saline water table in its footwall to the east . Post - lava offset on the Eureka Lilly fault is apparently variable along strike and may account for only one - half to a third of the total offset across the structure, believed to have initiated during Late Sevier orogeny . 3. District Mineralization and Structure The four subdistricts of the Tintic are in part distinguishable in terms of their known mineral occurrences, hosted within the deformed Palaeozoic sequence and, to a more limited extent, Oligocene monzonitic intrusions . The Main district is the most historically productive district by far, with characteristic carbonate - hosted lead - zinc - silver replacement deposits that form predominantly north to northeast - trending sub - horizontal zones rooted into subvertical chimney - like mineralized bodies rich in copper, gold and silver . Carbonate - replacement deposits with economic zinc ц lead ц silver are likewise present in the East district and the historically least - productive North district . The East district is unique in terms of the relative structural complexity of its deposits, and by the added presence of gold and silver - rich high - sulphidation fissure vein systems hosted within the brittle and unreactive Tintic Quartzite, such as at Trixie . The Southwest district is characterised by a relative dominance of igneous rocks, containing fissure systems hosted within the Silver City stock and smaller associated monzonitic porphyry intrusions . The Southwest district is also host to the Southwest Tintic porphyry copper system, viewed as subeconomic but with minor historical production from peripheral high - sulphidation, copper - silver - lead veins . Several key observations suggest the presence of additional and potentially economic porphyry centres within the district . These include indicator clay assemblages and elevated molybdenum and/or copper - lead ratios at the Big Hill, Silver Pass, and Government Canyon lithocaps, all contained within the Tintic Project claims area . 4. Geology, Structure and Mineralization at Trixie Mineralization at the Trixie test mine is structurally controlled within a north - south - trending fissure - vein and breccia system developed within the brittle Tintic Quartzite . Gold and silver - rich mineralization within the so - called Trixie vein system is best classified as high - sulphidation epithermal (see discussion in Section 8 ) . Current development and exploration at Trixie is focused within and in the footwall to the historically productive steep - to - the - west - dipping 75 - 85 structural corridor, primarily targeting the subvertical - to - the - east - dipping T 2 fissure vein and a network of smaller - scale likewise north - south - trending mineralized fissures in its hanging wall . Sub - horizontal Palaeozoic strata exposed in underground workings at Trixie are believed to occupy a position within or proximal to the hinge zone of the East Tintic anticline, the nature of which may exert primary influence on the geometry, frequency, and distribution of grade controlling structures within the 9 Tintic Project April 25, 2024

Osisko Development Corp. Trixie vein system . The stratigraphic contact between the Tintic Quartzite and overlying and impermeable lower shale member of the Ophir Formation appears to have a major controlling influence on the development and grade distribution of mineralization at Trixie . While controlling structures within the Trixie vein system do penetrate the younger overlying sequences, mineralization typically displays strong rheologic control and is restricted to the older and underlying brittlely fractured Tintic Quartzite host . The main shaft of the historic Trixie mine was collared at approximately 1 , 852 m ( 6 , 075 ft) elevation into an outcropping window of Middle Cambrian Teutonic Limestone . The shaft passes through the full thickness of the Ophir Formation to reach the Tintic Quartzite at a depth of approximately 125 m ( 410 ft) below surface . Current development stems off the historical 625 level of the mine with lesser development off the 750 level . Deeper historical workings include the 900 , 1050 , 1200 , and 1350 levels . The water table at Trixie currently sits below the lower limits of the Trixie main shaft, which extends another ~ 100 ft below the 1350 level, around 442 m below surface . The Late Eocene to Oligocene Packard Quartz Latite unconformably overlies the Palaeozoic sequence, highlighting a rugged palaeotopography and locally reaching thicknesses up to 380 m ( 1 , 250 ft) directly south of the ventilation shaft . North of the Trixie main shaft, the Tintic Quartzite is down - dropped an estimated 198 m ( 650 ft) across the east - west - trending sub - vertically north - dipping Trixie fault zone (Morris et al . , 1979 ) . At the very northern limits of development, the sequence is again offset relative down to the north across the Eureka Standard fault zone, which appears to consist locally of at least two major east - northeast trending splays . Though not fully constrained, relative stratigraphic offset across the Eureka Standard fault zone is of similar or greater magnitude to that observed across the Trixie Fault zone . The Eureka Lilly fault zone at Trixie runs sub - parallel to the 75 - 85 structural corridor and likewise dips steeply to the west . The two structures apparently converge just beyond the southern limits of current exploration and development . The historically mined South Survey Vein, which defines the southern limits of Trixie historic development, appears to occupy a position within or directly adjacent to Eureka Lilly structural corridor . The historic 756 ore shoot at the north end of Trixie development displays a steep northerly plunge in the footwall to the Trixie fault zone . At the southern end of Trixie development, an apparent southerly plunge to higher grade ore shoots within the historically mined 75 - 85 zone is less well understood . It has been previously suggested that the geometry of these ore shoots could be related to a presumed south - dipping splay of the Sioux Ajax fault zone, a system with known structural control on mineralization within the Mammoth and Iron Blossom mines in the Main Tintic district to the west . However, strong evidence for the presence of this structure at the southern limits of current development and exploration has yet to present . It has been more recently postulated that the apparent southerly plunge of the historically mined 75 - 85 zone ore shots may instead be controlled by the intersection of the 75 - 85 structure and the Eureka Lilly fault zone . 1.6 E XPLORATION P ROGRAMS Exploration work undertaken at the Tintic Project in 2022 and 2023 consisted of a coordinated underground mapping and sampling program at Trixie and a regional surface mapping and sampling campaign, as well as compilation of historical data from several of the largest mining operations in the 10 Tintic Project April 25, 2024

Osisko Development Corp. district . Underground at Trixie, post - advancement face, rib and back chip - sampling, and post - survey three - dimensional underground back and rib geologic mapping were conducted by the geological team . On surface, detailed geological and alteration mapping, structural measurements, and rock sampling were conducted by Osisko Development geologists, while soil samples were collected by a team from Rangefront Mining Services (Rangefront Mining) . No surface regional - scale mapping or sampling programs were conducted in 2022 . 1. 2023 Regional Surface Exploration The primary goal of the 2023 regional exploration program was to acquire a better understanding of the relationship between the known blind deposits of the East Tintic District and the surface lithological, alteration, geochemical, geophysical, spectral mineralogy and structural indicators which may be used to expand on known deposits and define new targets . To address this goal, available historical datasets were assembled, digitized and imported into Leapfrog and ArcGIS Pro, suites of rock samples were collected from across the property, a campaign of detailed lithological and alteration mapping was conducted, and an expansion of the existing soil sample grid was completed . The footprint of mapping and rock sampling covers approximately 1 , 000 hectares, while the 2023 soil sampling footprint covered approximately 830 hectares . The 2023 rock sampling campaign can be effectively subdivided into three subcategories, 1 ) sampling of pebble dikes, breccias and gossan zones as the most direct way to sample the hydrothermal plumbing system from surface, 2 ) the sampling of monzonite porphyry plugs stocks and dikes to better understand the magmatic system and to assess the potential for porphyry Cu - Au - Mo mineralization and 3 ) the sampling of the major mine - dump piles in the district with the goal of testing and constraining the proposed district scale metal zonation (e . g . moving from a Cu - Au rich core in the SW of the property outwards to Pb - Ag and eventually to Pb - Zn on the peripheries) . 1. Targeting and Exploration Potential One of the primary goals of the 2023 regional program was to develop drill - ready targets for future testing . Given the vast amount of available data from a wide range of sources and potential for multiple different deposit types in the district, the goal of this exercise was to remain as objective as possible and not be overly influenced by any one dataset . To do this, polygons were drawn in 29 different feature classes representing areas of anomalous prospectivity . For soil geochemistry, each element of interest or metric was filtered to the 90 th percentile before polygons were drawn over areas where at least two adjacent soils were above the threshold . Similarly, rock sample points were first filtered to remove mine dump samples, then further filtered to 90 th percentile and 30 m buffers were drawn . Buffers were also drawn around mapped breccia zones, pebble dikes, gossan zones and major faults . Favourable alteration polygons included areas of mapped Advanced argillic, sericitic, Iron - Oxide - rich and moderate to strong silica . Polygons representing the favourable zones of chargeability, resistivity and magnetism were also included . Underground mine workings were projected to surface with a 30 m buffer added . Points with a 30 m buffer were also added at each of the mapped prospects, shaft collars and adit entrances . Using GIS software, each of the polygon feature classes were added together to produce a single output layer with an attribute column containing the count of overlapping prospectivity . 11 Tintic Project April 25, 2024

Osisko Development Corp. From the targeting methodology described above, a total of 15 primary targets and 10 secondary targets were identified . Of the 15 primary targets, eight of them overlie zones of known mineralization, which is a good sign that the methodology works . For each of those 8 primary targets overlying known mines or mineralization, the exploration potential has been evaluated based on the available underground mapping, historical ore grades and production numbers . The additional exploration potential in these mines comes primarily from four categories : 1) Locations and orientations of economically mineralized structures that are already known . Because of extensive historical underground exploration and high - quality geological mapping much is already known about the locations, nature and orientation of the veins and breccias that will be targeted . This will considerably reduce the cost that would normally be incurred in determining these characteristics . 2) Changes to the value of metals . Most of the mines under consideration were closed due to unfavourable economic conditions between 1940 and the mid 1950 ’s . Since that time, the inflation adjusted gold price has more than tripled, meaning that much of the material that would have been deemed sub - economic at the time of mining will be above current cut - off grades . 3) Historical mining followed mineralization down to the elevation of the contemporary water table and stopped there, leaving all these deposits open at depth . Since the water table has dropped since ca . 1950 , more mineralized material, even above the historical cut - off grades, will now be accessible . 4) High probability of sub - parallel breccia/vein structures . The nature of the breccia/vein hydrothermal systems makes it likely that multiple sub - parallel structures would have been exploited in the pathway of the fluid/vapour outflows . Thus, by drilling at a high angle to the structures the potential of intersecting so far undiscovered and sub - parallel veins is maximized . 2. Exploration Drilling Programs 1. Surface RC Drilling Surface RC drilling of the Trixie Deposit commenced in July, 2022 . Layne Christensen Company (Layne) was the drilling contractor for this program and drilled until December, 2022 . A total of 8 , 770 m ( 28 , 773 ft) was drilled in 28 holes in 2022 . The RC assays from 20 holes were returned in 2023 and are included in the database . 2. Surface Diamond Drilling On December 1 , 2023 , Major Drilling commenced drilling on the copper - moly - gold target at Big Hill . By the end of 2023 , a total of 390 m ( 1 , 277 ft) had been drilled on the first hole . Initial target depths for the holes are 1 , 524 m ( 5 , 000 ft) . Work is continuing on this target . 3. Underground Diamond Drilling On October 3 , 2022 , Nasco Industrial Services and Supply LLC . (NISS) commenced drilling the Trixie deposit and, by December 19 , 2022 , had completed 990 . 6 m ( 3 , 250 ft) of underground diamond drilling 12 Tintic Project April 25, 2024

Osisko Development Corp. in 28 drill holes . In 2023 , NISS drilled a total 6 , 028 m ( 19 , 776 ft) of underground drilling in 73 holes at Trixie . A total of 122 new holes from the remainder of the 2022 drilling and 2023 drilling were included in the updated MRE . Underground holes were drilled in vertical fans oriented semi - orthogonally to the strike of the deposit . Multiple fans were drilled from each underground drill bay with both up and down holes ranging from dips of + to - 55 Σ averaging 67 m ( 220 ft) per hole . In October, 2023 , one hole commenced drilling to test for a copper - moly - gold porphyry target below the Trixie deposit . This hole was drilled to a depth of 626 m ( 2 , 054 ft) . At the time of data cut - off, assays are pending for this hole . This hole was not included in the Trixie MRE . 1.6.2.4 Drilling and Assay Problems Average diamond drill production of 12 . 2 m ( 40 ft) per day was typical of the 2023 program with all - in drilling costs around $ 213 /ft . Difficult drilling conditions addressed in previous reports have continued at Trixie . Recovery in the diamond drilling program averages a reasonable 90 . 1 % , however the core suffers significant destruction during the drilling process, resulting in difficult interpretations of significant mineralized structures, and increased uncertainty in the rock quality designation and recovery data . Broken ground, significant faulting and hard abrasive lithologies have resulted in slow sample production and further compromised the structural interpretation . In addition, the lack of structural data made true - width relationships difficult to determine from the drilling . A significant difference in assay grade is seen between the drilling results and results taken from underground face sampling at Trixie . Underground face samples typically show grades in 100 ’s to 1 , 000 ’s of grams per tonne ( 10 ’s to 100 ’s troy ounces per ton) whereas drilling results show occasional grade greater than 100 g/t Au . Sludge samples were collected from holes TRXU - DD - 23 - 057 to TRXU - DD - 23 - 072 to investigate of gold was washed out in fine material from drill cuttings . The results indicated anomalous sludge sample assays correlated with anomalous drill core assays . A total of five exploration cross - cuts were constructed to investigate the correlation with drill hole data and face sampling, further to the south and cross cutting the T 2 , T 4 and 75 - 85 zones . The face sampling correlated with the drill hole results . Lastly, any sample that had logged T 2 lithologies or grade greater than 1 . 0 g/t Au were re assayed using screen metallic analysis to gain a bigger sample and compare screen metallic with fire assay . The results were comparable . It is concluded that the drill hole data are representative of and accurate for the gold at Trixie . The expression, “Drill for structure, mine for grade” can be applied at Trixie . 7. M ETALLURGICAL T ESTWORK 1. Sample Provenance Two bulk metallurgical composite samples were prepared by Osisko Development from mineralization obtained during the exploration test mining performed during 2021 and early 2022 . The first bulk composite (T 2 Soil Sample) was prepared from laboratory high grade coarse reject samples, over an 8 - month period from April to December, 2021 . This 477 . 5 kg sample was selected to 13 Tintic Project April 25, 2024

Osisko Development Corp. be representative of a T 2 /T 4 high grade run - of - mine (ROM) material leached in the TCM pilot vat leach facility (VLF) during 2021 and 2022 . The second composite sample (T 4 Soil Sample) was prepared using four sample increments at various mine accessible points of the T 4 structure . This 171 kg sample was selected to be representative of the bulk T 4 structure at the 625 level . 1.7.2 Metallurgical Testwork Metallurgical testing was undertaken by Kappes, Cassiday & Associates (KCA), Reno, Nevada and included the following primary testwork : 14 Tintic Project April 25, 2024 1.7.2.1  Multi - element analysis of the samples.  Diagnostic leaching.  Gold deportment mineralogy (AMTEL).  Bulk mineralogy (FLSmidth).  Bottle roll leach testing at various particle sizes.  Gravity separations tests.  Comminution testwork (Hazen Research). Sample Characterization The head grades of the two samples were 64 . 1 g/t Au and 102 g/t Ag for T 2 , and 8 . 8 g/t Au and 14 . 5 g/t Ag T 4 . Both samples are characterized by high silica content ( 92 % to 96 % ) and low sulphide sulphur content, typically less than 0 . 2 % S 2 - . Copper in the T 2 sample measured about 750 g/t but only about half of this was readily cyanide soluble . Diagnostic leach tests using samples of the two composites ground to 80 % passing 74 microns indicated that approximately 99 % of the gold in sample T 2 and 88 % in sample T 4 , is directly soluble . Mineralogical gold deportment studies showed that 99 % of the gold in sample T 2 was exposed and potentially cyanide soluble, while T 4 material showed that 81 % of the gold was free gold with hessite and telluride associations of 7 % and 10 % respectively . The gold grains identified in sample T 2 tended to be larger than those in T 4 . Comminution tests showed that both samples were relatively hard and abrasive . Bond ball mill work indices of 18 . 2 kWh/t and 19 . 0 kWh/t were calculated for T 2 and T 4 , respectively . Deleterious elements often encountered in gold mineral resources are present in low concentrations in both these samples . Mercury is < 3 ppm, selenium was analyzed at or below 5 ppm, and arsenic was 176 g/t on average for T 2 and 29 g/t for the T 4 sample . The T 2 high grade structure sample did show relatively higher concentrations of these deleterious elements than the T 4 material . The sulphide

Osisko Development Corp. sulphur content was relatively low for both samples and, therefore, it is unlikely that the mineralization will be acid generating . 3. Testwork Results Bottle roll cyanide leach tests gave results of up to 99 % Au and 88 % Ag extraction after 72 hours for sample T 2 . The corresponding best T 4 tests achieved 98 % Au and 84 % Ag extraction . Gravity separation tests using sample T 2 suggested that approximately about 40 % gold can be recovered by gravity separation . 4. Additional Testwork In addition to the metallurgical/mineralogical work outlined above, Osisko Development reports that testwork was completed by Patterson Cooke to determine the dewatering behaviour of leach tailings samples . This program of work included thickener settling rates, filtration rates, and Proctor compaction tests . Osisko Development also reported that testwork to support engineering of a cyanide destruction system was completed by Forte Dynamics . Osisko Development reports that around 70 to 75 % gold recovery was achieved by the pilot scale operation of the vat leach facility, using crushed mineralization . This reported recovery is allegedly supported by regular internal bottle roll test results, using crushed and ground vat feed samples over one year of test mining, which typically showed about 83 % gold extraction at a top size of 5 mm . Micon was not provided with test reports to verify this work . 8. T RIXIE M INERAL R ESOURCE E STIMATE 1. Introduction The 2024 Mineral Resource Estimate for the Trixie test mine (the “ 2024 MRE”), was conducted between February and March 2024 . This is an update to the Initial MRE dated January, 2023 . 2. Methodology The mineral resource area for the Trixie deposit covers a strike length of approximately 530 m down to a vertical depth of approximately 350 m below surface . The wireframe models for the Trixie deposit were prepared using LeapFrog GEO v . 2023 . 2 (LeapFrog) . Wireframe modelling and included the construction of six mineralized domains constrained to the extents of the regional - scale Tintic Quartzite lithologic unit and capped by shale belonging to the overlying lower member of the Ophir Formation . Geostatistical analyses were carried out using Datamine Snowden Supervisor v . 8 . 15 . 0 . 3 (“Supervisor”) . The estimation, block model and grade interpolation, were prepared using Datamine StudioTM RM v . 2 . 0 . 66 . 0 (Datamine) . Resource - level potentially mineable underground shapes were created using the Deswik CAD v . 2023 . 2 . 762 Shape Optimizer module (Deswik . SO v . 5 . 0 . 3792 ) . 15 Tintic Project April 25, 2024

Osisko Development Corp. 3. Resource Database The close - out date for the Trixie deposit 2024 MRE database is February 13 , 2024 . It consists of 161 validated diamond drill holes, totalling 9 , 305 . 51 m of assayed core and comprised of 8 , 373 sample intervals . The database also includes 22 validated RC drill holes, totalling 3 , 447 . 29 m of assayed RC drilling and comprising 2 , 430 sample intervals, and 1 , 387 underground chip sample strings comprised of 6 , 191 sample intervals assayed for gold and silver . The database includes validated location, survey and assay results . It also includes lithological descriptions taken from drill core logs . The database covers the strike length of each mineralized domain at variable drill hole and chip sample spacings, ranging between 1 . 5 and 50 m . In addition to the tables of raw data, each database includes several tables of calculated drill hole composites and wireframe solid intersections, which are required for the statistical evaluation and mineral resource block modelling . 4. Geological Model The geological model of the Trixie deposit was prepared in LeapFrog, using underground mapping, chip samples, RC drill holes, and validated diamond drill holes, all completed by February 13 , 2024 . A total of six mineralized domains, were modelled, with each domain restricted up dip by its contact with the lower shale member of the Ophir Formation, as this contact acts as an impermeable cap to mineralizing fluids . The domains modelled were the T 2 , T 3 , T 4 , Wild Cat, 40 Fault and the 75 - 85 . In addition, a north - south trending sub - vertically dipping fault structure has been mapped across multiple underground development headings near the 625 level and has been intercepted in multiple drill holes . Though the full extent of the structure is at present unknown, it is currently inferred to project through the entirety of the model . As underground mapping indicates a minor offset of the T 2 structure across this fault, it is used as a hard boundary for geological modelling and grade interpolation . The model is thus split into east and west fault blocks, with each mineralized domain subdivided into respective east and west subdomains . 5. Geostatistical Analysis 1. Compositing Most of the analytical samples were collected with lengths between 0 . 15 and 1 . 83 m . A modal composite length of approximately 1 . 22 m was applied to all domains, generating composites as close to 1 . 22 m as possible, while creating residual intervals with a minimum length of 0 . 06 m . Composite samples were derived from raw values within the modelled resource domains . 16 Tintic Project April 25, 2024

Osisko Development Corp. 2. High grade Capping Multiple capping (different capping at different ranges in each domain) was selected as the capping methodology for high grade outlier gold and silver assays at the Trixie deposit . The top capping thresholds were selected based on the probability plots and vary from 50 . 0 g/t to 1 , 600 . 0 g/t Au and 300 . 0 g/t to 2 , 300 . 0 g/t Ag . The maximum range for high - grade continuity was established using the indicator variograms, which suggest a loss of continuity after 3 . 0 m to 9 . 0 m, depending on the mineralized domain . A range of 7 . 6 m was selected and applied to all zones as a general average search range for the first pass grade top cut interpolation . Secondary capping thresholds were also selected based on the probability plots and these vary from 20 . 0 g/t to 250 . 0 g/t Au and 125 . 0 g/t to 1 , 300 . 0 g/t Ag . Secondary capping was applied to the composites when search ranges exceeded 7 . 6 m . Continuity of the secondary capping was confirmed using indicator variograms . 3. Density The density databases contain 512 measurements taken on samples across multiple geologic domains . Average bulk density values in the mineralized domains were assigned to the T4 (2.618 t/m 3 ), T2 (2.955 t/m 3 ), T3 (2.638 t/m 3 ), Wild Cat and 40 Fault (2.621 t/m 3 ), and 75 - 85 (2.617 t/m 3 ) domains. A density of 0.00 t/m 3 was assigned to the underground development from all past mining activities. Bulk densities were used to calculate tonnages from the volume estimates in the block model. 4. Variogram Analysis The spatial distribution of gold and silver was evaluated through variogram analysis and spherical variograms were modelled for each of the mineralized domains. All variogram analyses and modelling were performed in “Supervisor” . Primary directions and orientations of the variograms were observed in the data and visually in 3 D space . These orientations were then examined statistically within the software package to ensure that they represented the best possible fit of the geology and grade continuity . 5. Search Parameters For all domains, the 3 D directional - specific search ellipses were guided by the local orientation of the mineralized structures for an anisotropic search . The search radii were influenced and determined by both the grade and indicator variograms . The third direction of the search radii was primarily influenced by the average widths of mineralization observed in the underground mapping . Grade distributions and kriging neighbourhood analyses (KNA) were used to help guide the number of composites to use for the grade interpolations. 17 Tintic Project April 25, 2024

Osisko Development Corp. Search neighbourhoods used different capping levels, as determined through a threshold analysis . 6. Block Model and Grade Interpretation The criteria used in the selection of block size include drill hole spacing, composite length, the geometry of the modelled zone, and the anticipated mining methods . A block size of 1 . 22 x 2 . 44 x 2 . 44 m was used . Sub - cells were used, allowing a resolution of 0 . 30 m x 0 . 30 m x 0 . 30 m . Sub - celling of the parent block size was used to efficiently represent the volumes of the modelled mineralized domains . Sub - cells were assigned the same values as their parent cell . No rotation was applied to the block model . Three search passes were used for interpolating grades into the block model, applying the appropriate grade caps for each . A series of sensitivity runs were performed to examine the impact of various parameters on the estimation . Parameters were selected, and gold and silver were estimated using inverse distance squared (ID 2 ) . Each subsequent estimation pass used increasing search neighbourhood sizes, determined from grade and indicator variogram results . Samples from a minimum of two drill holes or chip strings were required to estimate all blocks . 7. Model Validation Mineralized domain models were validated using a variety of methods including visual inspection of the model grades, grade distributions compared to the informing raw samples, statistical comparisons of informing composites to the model for local and global bias, and reconciliation comparing the model to observed grades from underground development . All analyses indicate that the model follows the grade distribution of the informing composites and that the accuracy of the model has been demonstrated . The total global comparison for each search neighbourhood is within an 8 % tolerance for global bias and a local comparison is within 1 % for a three - month average reconciliation . The QP considers the model to be a reasonable representation of the Trixie mineralization, based on the current level of sampling . 8. Mineral Resource Classification Mineral Resource Classification was determined through geometric criteria deemed reasonable for the deposit . No material has been classified as measured for the 75 - 85 domain due to the lack of chip sample data that fully crosscuts or follows the mineralization . Blocks estimated within the mineralized domains not meeting the criteria to classify them as either measured, indicated or inferred were not classified and are not included in the mineral resource estimate . 9. Reasonable Prospects for Eventual Economic Extraction A reasonable economic cut - off grade for resource evaluation at the Trixie deposit was determined using the parameters presented in Table 1 . 1 . The QPs consider the selected cut - off grade of 4 . 32 g/t Au to be appropriate, based on the current knowledge of the Project . 18 Tintic Project April 25, 2024

Osisko Development Corp. Table 1.1 Resource Cut - Off Grade Parameters 19 Tintic Project April 25, 2024 Values (USD) Parameters $74.33 Mining Cost ($/ST) $52.71 G&A ($/ST) $41.00 Heap Leach Processing ($/ST) $2.65 Total Refining Cost /oz $1,750.00 Gold Price ($/oz) 4.50% Royalty (Combination) 80.0% Heap Leach Au Recovery 4.32 Cut - off Grade (COG) Table supplied by Osisko Development. *ST represents short ton. The Deswik Stope Optimizer (DSO) was used to demonstrate spatial continuity of the mineralized zones within “potentially mineable shapes” . The DSO parameters used a minimum mining shape of 6 . 1 m along the strike of the deposit, a height of 6 . 1 m and a minimum width of 1 . 5 m . The maximum shape measures 6 . 1 m x 6 . 1 m x 12 . 2 m in width . Only those blocks of the model constrained by the resulting conceptual mineable shapes are reported as resources . In the opinion of the QPs, the use of the conceptual mining shapes as constraints to report Mineral Resource Estimates demonstrate that the reported resources meet the criteria defined in the CIM Definition Standards ( 2014 ), and the MRMR Best Practice Guidelines ( 2019 ) for reasonable prospects of eventual economic extraction . Economics of the resources were based on the gold equivalent content based on gold and silver grades within the mineralized domains . The gold equivalence was calculated by incorporating the silver content based on a silver : gold ratio, calculated with the gold price and metallurgical recovery reported in Table 1 . 1 and a silver price of US $ 23 . 00 /oz and a silver metallurgical heap leach recovery of 45 % . 1.8.10 Mined Void Depletion All current underground development at the Trixie deposit has been conducted by TCM and the void solids for this development have been surveyed, modelled, and kept up to date by TCM . Using recent drill hole intercepts of historic voids, along with historic level plans, sections, and reports, an attempt was made through 2023 to re - model the 3 D historic mine workings . To reduce the risk of the uncertainty in void locations, it was determined to use buffers around the historical shapes to deplete the resource estimate . A 6 . 1 m buffer was developed around the main shaft and the vent raise, as these are critical pieces of infrastructure . A 3 . 0 m buffer was developed around most of the remaining re - modelled historic levels and stopes . However, a 1 . 5 m buffer was developed around the historic development in the areas in which a high percentage of recent drill holes intersected the voids . The historical buffers and the current development voids are used to deplete the final mineral resource of the Trixie deposit .

Osisko Development Corp. 11. Trixie Mineral Resource Estimate Statement The QPs have classified the 2024 MRE as Measured, Indicated, and Inferred Mineral Resources based on data density, search ellipse criteria, and interpolation parameters . The 2024 MRE is considered a reasonable representation of the mineral resources of the Trixie deposit, based on the current quality data and geological knowledge . The Mineral Resource Estimate follows the 2014 CIM Definition Standards on Mineral Resources and Reserves . Table 1 . 2 displays the results of the 2024 MRE at a 4 . 32 g/t Au cut - off grade for the Trixie deposit . 12. Mineral Resource Grade Sensitivity Analysis Table 1 . 3 shows the cut - off grade sensitivity analysis of gold and silver for the 2024 MRE . The reader should be cautioned that the figures provided in Table 1 . 3 should not be interpreted as a mineral resource statement . The reported quantities and grade estimates at different cut - off grades are presented for the sole purpose of demonstrating the sensitivity of the mineral resource model for gold to the selection of a reporting cut - off grade . Micon’s QP has reviewed the MRE cut - off grades used in the sensitivity analysis, and it is the opinion of the QP that they meet the test for reasonable prospects of eventual economic extraction at varying prices of gold . 20 Tintic Project April 25, 2024

Osisko Development Corp. Tintic Project 21 April 25, 2024 Table 1.2 Trixie Deposit Mineral Resource Estimate (MRE) Statement Contained Metal Grade Gold Equivalent Contained Metal Grade Silver Contained Metal Grade Gold Quantity Cut - off Grade Classification Gold Equivalent ('000 oz) (g/T) Silver ('000 oz) (g/T) Gold ('000 oz) (g/T) ('000 T) Gold (g/T) 107 27.82 238 61.73 105 27.36 120 4.32 Measured 47 11.62 240 59.89 45 11.17 125 4.32 Indicated 154 19.56 478 60.80 150 19.11 245 4.32 Total Measured + Indicated 53 8.16 315 48.55 51 7.80 202 4.32 Inferred Notes: 1. Effective date of the Mineral Resource Estimate (MRE) is 14 March 2024 . 2. Mr . William Lewis P . Geo . , of Micon International Limited and Alan J San Martin, AusIMM(CP), of Micon International Limited have reviewed and validated the MRE for Trixie and are independent “Qualified Persons” as defined in Canadian National Instrument 43 - 101 – Standards of Disclosure for Mineral Projects ("NI 43 - 101 ") and are responsible for the 2024 MRE . 3. The mineral resources disclosed in this presentation were estimated using the CIM standards on mineral resources and reserves definitions, and guidelines prepared by the CIM standing committee on reserve definitions and adopted by the CIM council . 4. Mineral Resources are reported when they are within potentially mineable shapes derived from a stope optimizer algorithm, assuming an underground longhole stoping mining method with stopes of 6 . 1 m x 6 . 1 m x minimum 1 . 5 m dimensions . 5. Mineral Resources are not mineral reserves and do not have demonstrated economic viability . 6. Geologic modelling was completed by Osisko Development modelling geologist Jody Laing, P.Geo., using Leapfrog Geo software. The MRE was completed by Osisko Development chief resource geologist, Daniel Downton, P.Geo. using Datamine Studio RM 2.0 software. William Lewis and Alan San Martin of Micon International Ltd. reviewed and validated the Mineral Resource Model. 7. The estimate is reported for an underground mining scenario. The cut - off grade of 4.32 g/t Au was calculated using a gold price of $US1,750/oz, a CAD:USD exchange rate of 1.3; total mining, processing and G&A costs of $US168.04/imperial ton, a refining cost of $US2.65/ounce, a combined royalty of 4.5% and an average metallurgical gold recovery of 80%. 8. The stope optimizer algorithm evaluated the resources based on a gold equivalent grade which incorporates the silver grade estimate and assumes a silver price of $US23/oz and metallurgical silver recovery of 45%. 9. Average bulk density values in the mineralized domains were assigned to the T2 (2.955 T/m 3 ), T3 (2.638 T/m 3 ), T4 (2.618 T/m 3 ), Wild Cat, and 40 Fault (2.621 T/m 3 ), and 75 - 85 (2.617 T/m 3 ) domains. 10. Inverse Distance Squared interpolation method was used with a parent block size of 1.2 m x 2.4 m x 2.4 m. 11. The Mineral Resource results are presented in - situ. Calculations used metric units (metres, tonnes, g/t). The number of tonnes is rounded to the nearest thousand. Any discrepancies in the totals are due to rounding effects. 12. Neither Osisko Development nor the Micon QPs are aware of any known environmental, permitting, legal, title - related, taxation, socio - political, marketing or other relevant issue that could materially affect the mineral resource estimate other than disclosed in the Technical Report.

Osisko Development Corp. Table 1.3 Gold Grade Sensitivity Analysis at Different Cut - Off Grades 22 Tintic Project April 25, 2024 ~ Au Price @ COG AuEq oz AuEq g/T AG oz AG g/T AU oz AU g/T COG Tonnes Classification 170,985 12.48 628,563 45.87 166,338 12.14 2.00 426,210 Measured + Indicated 168,810 13.34 610,382 48.24 164,297 12.98 2.25 393,582 166,715 14.16 590,666 50.18 162,348 13.79 2.50 366,130 164,787 14.88 572,631 51.71 160,553 14.50 2.75 344,413 162,831 15.62 555,740 53.31 158,722 15.23 3.00 324,251 161,276 16.33 541,350 54.83 157,273 15.93 3.25 307,112 ~$2,100 159,603 17.06 525,681 56.19 155,716 16.64 3.50 291,005 ~$2,000 157,708 17.90 510,470 57.94 153,934 17.47 3.75 274,040 ~$1,900 156,010 18.58 495,091 58.95 152,350 18.14 4.00 261,219 ~$1,800 154,159 19.37 480,968 60.43 150,604 18.92 4.25 247,549 153,782 19.56 478,078 60.80 150,248 19.11 4.32 244,590 ~$1,700 152,734 20.03 469,058 61.52 149,266 19.58 4.50 237,143 ~$1,600 151,156 20.75 457,428 62.80 147,774 20.29 4.75 226,567 ~$1,500 149,987 21.47 447,646 64.07 146,677 20.99 5.00 217,327 ~$1,450 148,801 22.22 436,296 65.16 145,575 21.74 5.25 208,263 ~$1,400 147,032 23.03 422,504 66.19 143,909 22.55 5.50 198,538 145,466 23.78 412,467 67.43 142,416 23.28 5.75 190,247 144,144 24.52 403,074 68.57 141,164 24.01 6.00 182,842 142,117 25.52 389,880 70.02 139,235 25.01 6.25 173,188 140,550 26.34 380,902 71.39 137,734 25.81 6.50 165,955 139,599 27.31 374,280 73.21 136,832 26.76 6.75 159,018 138,207 28.10 365,663 74.34 135,503 27.55 7.00 152,986 86,977 4.79 561,011 30.88 82,830 4.56 2.00 565,158 Inferred 82,529 5.12 525,360 32.61 78,645 4.88 2.25 501,077 77,645 5.51 485,528 34.46 74,056 5.26 2.50 438,189 73,042 5.90 451,119 36.46 69,707 5.63 2.75 384,864 69,162 6.27 423,112 38.38 66,034 5.99 3.00 342,880 65,928 6.60 399,562 39.98 62,974 6.30 3.25 310,856 ~$2,100 62,549 6.96 376,306 41.84 59,767 6.65 3.50 279,722 ~$2,000 58,868 7.39 352,865 44.28 56,260 7.06 3.75 247,838 ~$1,900 55,904 7.76 333,578 46.31 53,438 7.42 4.00 224,039 ~$1,800 53,379 8.10 318,207 48.26 51,026 7.74 4.25 205,085

Osisko Development Corp. ~ Au Price @ COG AuEq oz AuEq g/T AG oz AG g/T AU oz AU g/T COG Tonnes Classification 52,895 8.16 314,678 48.55 50,569 7.80 4.32 201,603 ~$1,700 51,262 8.39 304,803 49.90 49,009 8.02 4.50 190,002 ~$1,600 49,181 8.71 291,971 51.73 47,022 8.33 4.75 175,561 ~$1,500 47,381 8.99 279,718 53.08 45,313 8.60 5.00 163,894 ~$1,450 45,508 9.28 267,379 54.53 43,531 8.88 5.25 152,515 ~$1,400 43,625 9.57 254,818 55.92 41,742 9.16 5.50 141,728 42,000 9.84 244,126 57.21 40,196 9.42 5.75 132,718 40,255 10.14 233,028 58.70 38,532 9.71 6.00 123,472 38,480 10.46 219,939 59.80 36,854 10.02 6.25 114,401 36,815 10.79 206,087 60.43 35,291 10.35 6.50 106,080 35,310 11.11 194,185 61.10 33,874 10.66 6.75 98,845 33,747 11.44 182,579 61.91 32,397 10.99 7.00 91,725 23 Tintic Project April 25, 2024 Table supplied by Osisko Development . 9. C ONCLUSIONS With the acquisition of the Tintic Project in May, 2022 , Osisko Development has acquired the majority of the East Tintic Mining District in Utah . The East Tintic Mining District is part of the larger Tintic Mining District, where economic mineralization was first discovered in 1869 , and which, by 1899 , had become one of the richest mining districts in the United States . Active mining in the district continued through the 20 th and beginning of the 21 st century . The exploration, compilation and development work on the Trixie deposit conducted by Osisko Development since the initial MRE dated January, 2023 , has resulted in a better understanding of the geology and mineralization . Based upon the work, Osisko Development has been able to provide an update to the mineral resource estimate for the Trixie deposit, with additional high priority target areas along strike to the north and at depth below historical areas at 756 and Survey Vein . Micon QPs have reviewed and validated the programs conducted by Osisko Development which are the basis for the 2024 mineral resource estimate, as well as validating the mineral resource itself . It is Micon’s QPs opinion that the exploration programs, which are the basis of the mineral resource estimate, and the mineral resource estimate itself have both been conducted according to industry best practices as outlined by the CIM . Therefore, Micon’s QPs believe that the mineral resource estimate can be used as the basis for further exploration and development work to expand the mineral resources and undertake further mining and economic studies on the Tintic Project . 1. Risks and Opportunities All mineral resource projects have a degree of uncertainty or risk associated with them which can be due to several factors which can be technical, environmental, permitting, legal, title, taxation, socio -

Osisko Development Corp. economic, marketing, political, and others . All mineral resource projects also present their own opportunities . Table 1 . 4 outlines some of the Trixie project risks, their potential impact and possible ways of mitigation . Table 1 . 4 also outlines some of the Trixie projects opportunities and potential benefits . Table 1.4 Risks and Opportunities at the Trixie Project 24 Tintic Project April 25, 2024 Possible Risk Mitigation Description and Potential Impact Risk Develop grade control procedures that will allow the collection and analysis of extra grade control samples prior to mining an area. Poor grade forecasting and reconciliation. Local grade continuity It is recommended to develop a procedure of collecting density measurements spatially throughout the deposit at regular intervals and implement their use in future mineralization models. Misrepresentation of the in - situ tonnes, which also affects the in - situ metal content estimate. Local density variability Continue infill drilling to upgrade mineral inventory to Measured and Indicated Category. If geologic interpretation and assumptions (geometry and continuity) used are inaccurate, then there is a potential lack of gold grade or continuity. Geologic Interpretation. Conduct drilling and underground surveys to validate void locations and document intersected workings and refine void management plan. If technical knowledge of the historic mine infrastructure is incomplete, then this deficiency could lead to local inaccuracies of the mineral resources and potential safety exposures Void Locations. Conduct additional metallurgical tests. Recovery might be lower than what is currently being assumed. Metallurgical recoveries are based on limited testwork. Refine recruitment and retention planning and/or make use of consultants. Technical work quality will be impacted and/or delayed. Difficulty in attracting experienced professionals. Incorporate more comprehensive geotechnical data from drilling. Conduct additional geotechnical assessment and analysis. Mining methods and dimensions selected might be different than what is currently being assumed. Conceptual mine plans and stoping layouts are based on limited geotechnical testwork. Potential Benefit Explanation Opportunities Adding resources increases the economic value of the mining project. Potential to identify additional prospects and resources. Surface and underground exploration drilling. Lower capital and operating costs. Additional metallurgical testwork can be performed to determine if recovery can be improved through ore sorting, flotation or cyanidation. Potential improvement in metallurgical recoveries. Improved mining productivity and lower costs. Geotechnical analysis may determine mining methods and dimensions can be improved. Potential improvement in mining assumptions.

Osisko Development Corp. 10. E XPLORATION B UDGET AND F URTHER R ECOMMENDATIONS 11. E XPLORATION B UDGET AND O THER E XPENDITURES The budgets presented in Table 1 . 5 and Table 1 . 6 summarize the estimated costs for completing the recommended drilling and exploration program described below . The budget is a cost estimate and guideline to complete the work . The budget is divided into a two - phase approach, with the second phase contingent on the successful completion of the first . It is the opinion of the Micon QPs that all of the recommended work is warranted and that only the amount of exploration drilling on new targets needs to be finalized . Micon and its QPs appreciate that the nature of the programs and expenditures may change as the further studies are undertaken, and that the final expenditures and results may not be the same as originally proposed . The underground development for exploration is contingent upon successful drilling results from surface and existing access underground . The Micon QPs are of the opinion that Osisko Development’s recommended work program and proposed expenditures are appropriate and well thought out . The Micon QPs believe that the proposed budget reasonably reflects the type and amount of the activities required to advance the Trixie deposit . Table 1.5 Tintic Project, Recommended Budget for Further Work, Phase 1 (USD) 25 Tintic Project April 25, 2024 Total (USD) Quantity Cost/ft (approx.) All included Type of Activity $4,500,000 15,000 ft $300/ft Trixie exploration drilling (756, T2 North, 75 - 85/Survey) $900,000 2,400 ft $375/ft Trixie exploration development $680,000 1,700 $400/ft Trixie porphyry exploration drilling $10,000,000 40,000 ft. $250/ft Regional drilling (Eureka Standard, North Lily, Big Hill) $2,400,000 40,000 $60/sample Assays $1,500,000 Surface geochemical surveys, surface and underground sampling and mapping, GIS compilation $1,000,000 Operational and environmental permits and licenses $1,500,000 Test Stoping $200,000 Concept mine engineering and geotechnical update $250,000 Metallurgical test work $22,680,000 Property wide activities, subtotal $2,268,000 Contingency (~10%) $25,948,000 Total Phase 1 Table provided by Osisko Development.

Osisko Development Corp. Table 1.6 Tintic Project, Recommended Budget for Further Work Phase, 2 (USD) 26 Tintic Project April 25, 2024 Total (USD) Quantity Cost/ft (approx.) All included Type of Activity $5,200,000 20,000 ft. $260/ft. Additional infill and exploration drilling on existing resource $5,200,000 20,000 ft. $260/ft Additional regional drilling on CRD targets $200,000 Updated MRE $1,000,000 Completion of an internal scoping study for engineering $18,750,000 7,500 ft $2,500/ft Underground development for exploration $30,350,000 Subtotal Phase 2 $3,035,000 Contingency (~10%) $33,385,000 Total Phase 2 $59,333,000 Total Phase 1 and 2 Table provided by Osisko Development . 1.12 F URTHER R ECOMMENDATIONS Based on the results of the MRE reported herein Micon’s QPs recommend further exploration and development of Trixie deposit . It is recommended that Osisko Development continues with underground exploration drilling at Trixie in the areas north of T 2 and T 4 at the 625 Level, down dip of 756 , and down plunge of 75 - 85 to the presumed location of the Survey Vein and Sioux Ajax Fault . In addition to exploration at Trixie, it is recommended that Osisko Development continue its exploration program on the other mineral targets on the Tintic Property, with continued surface mapping and sampling, data compilation and surface drilling of regional high sulphidation, CRD and porphyry targets . In summary, the following work program is recommended . 1. Exploration Work : a) Conduct an additional approximately 4 , 500 m ( 15 , 000 ft . ) of underground diamond drilling for exploration and delineation at Trixie, with focus on 756 , South Survey, T 2 North and infill drilling . b) Conduct additional exploration drilling for a copper - gold - moly porphyry at depth below Trixie . c) Commence surface drilling of regional targets to potentially add further mineral resources in secondary deposits . Focus on Eureka Standard and North Lily, and porphyry targets around the Big Hill area . Each target should have a phase 1 of 10 , 000 m of surface drilling to adequately test the mineral potential . d) Continue generative work within the greater Tintic Project, including geophysical interpretation, historic data compilation, and geologic modelling of CRD targets at Tintic Standard and Burgin .

Osisko Development Corp. 2. Metallurgical Testwork: a) Leaching tests to optimize conditions in terms of precious metal recovery, capital costs and operating costs. b) Comparative testwork and techno - economic study to compare heap, VAT and agitation leaching technologies. c) Geochemical characterization testwork on representative feed and residue samples. d) Appropriate additional comminution testing, depending on the most likely process flowsheet. e) Characterization and leaching behaviour testwork on sample of 75 - 85 material to de - risk processing variability of this structure. f) Variability testwork. 3. Internal Scoping Study : a) Complete independent metallurgical testwork at the Trixie test mine . Conduct variability testwork and separate recoverability testwork for each zone . If the zones exhibit notable or significant differences in recoveries, incorporate those into an updated resource model . b) Complete further geotechnical work . c) Identify further permitting considerations and potential environmental studies for the Project . d) Continue with further community engagement and social license management . e) Undertake further detailed economic analysis, based upon engineering and metallurgical trade - off studies . 27 Tintic Project April 25, 2024

Osisko Development Corp. 1. INTRODUCTION 2. T ERMS OF R EFERENCE Osisko Development Corp . (Osisko Development) has retained Micon International Limited (Micon) to independently review and verify its mineral resource estimate (MRE) for the Trixie deposit located within the boundaries of its Tintic Project (the Project) in the State of Utah, USA . , and to compile a Canadian National Instrument (NI) 43 - 101 Technical Report disclosing the results of the MRE . The MRE was completed by Osisko Development’s chief resource geologist, Daniel Downton, P . Geo . , using Datamine Studio RM Pro 1 . 12 software . The MRE was then reviewed and validated by William Lewis, P . Geo . and Ing . Alan San Martin, AusIMM(CP), of Micon . William Lewis, P . Geo . , who is independent of Osisko Development and is a Qualified Person (QP) within the meaning of NI 43 - 101 , is responsible for the mineral resource estimate disclosed in this report, by virtue of his independent review and validation of the work conducted by Osisko Development . When conducting, reviewing and validating the mineral resource estimate, Osisko Development and Micon’s QPs used the following guidelines, as issued by the Canadian Institute of Mining, Metallurgy and Peroleum (CIM) : 1. The CIM Definitions and Standards for Mineral Resources and Reserves, adopted by the CIM council on May 10 , 2014 . 2. The CIM Estimation of Mineral Resources and Mineral Reserves Best Practice Guidelines, adopted by the CIM Council on November 29 , 2019 . This report discloses technical information, the presentation of which requires the QPs to derive sub - totals, totals and weighted averages that inherently involve a degree of rounding and, consequently, introduce a margin of error . Where these occur, the QPs do not consider them to be material . The conclusions and recommendations of this report reflect the QPs best independent judgment in light of the information available to them at the time of writing . Micon and the QPs reserve the right, but will not be obliged, to revise this report and conclusions if additional information becomes known to them subsequent to the date of this report . Use of this report acknowledges acceptance of the foregoing conditions . This report is intended to be used by Osisko Development subject to the terms and conditions of its agreement with Micon . That agreement permits Osisko Development to file this report as a Technical Report on SEDAR ( www . sedar . com ) pursuant to provincial securities legislation, or with the Securities Exchange Commission (SEC) in the United States . Neither Micon nor the individual QPs have, nor have they previously had, any material interest in Osisko Development or related entities . The relationship with Osisko Development is solely a professional association between the client and the independent consultants . This report is prepared in return for fees based upon agreed commercial rates and the payment of these fees is in no way contingent on the results of this report . 28 Tintic Project April 25, 2024

Osisko Development Corp. Micon and the QPs are pleased to acknowledge the helpful cooperation of Osisko Development management, personnel and consulting field staff, all of whom made any and all data requested available and responded openly and helpfully to all questions, queries and requests for material . This report supersedes and replaces all prior Technical Reports written for the Trixie deposit and the Tintic Project . 2.2 D ISCUSSIONS , M EETINGS , S ITE V ISITS AND Q UALIFIED P ERSONS In order to undertake the review and validation of the mineral resource estimate for the Trixie deposit, the QPs of this Technical Report held a number of discussions and meetings with Osisko Development’s personnel and contractors, to discuss details relevant to the exploration programs, Quality Assurance/Quality Control (QA/QC) programs, parameters used for the mineral resource estimate and the mineral resource estimate itself . The discussions were held via email chains and phone calls, as well as Microsoft Teams meetings . The discussions were open, frank and at no time was information withheld or not available to the QPs . A site visit was conducted from February 5 to February 8 , 2024 . The site visit was undertaken by Mr . Lewis to independently verify the updated geological interpretation, mineralogy, drilling programs and the QA/QC programs completed since the previous site visit in September, 2022 . A number of verification samples were collected during the 2022 site visit by Mr . Lewis and the results of the samples are discussed in Section 12 of this report . The 2022 verification program demonstrated the nature of the mineralization at the Trixie deposit and no further verification sampling was conducted during the February, 2024 site visit . Prior to the 2024 site visit, the objectives of that visit were discussed between Osisko Development’s Vice President of Exploration, Maggie Layman, P . Geo . and William Lewis . Mr . Lewis visited the different areas of the property, with an emphasis on verifying the exploration/evaluation works completed to date, as well as obtaining a general overview of the current work at the Trixie test mine . An inspection was made of the underground drilling platform, as well as mine and exploration workings at the Trixie deposit, along with a visit to the surface coreshack . During the visit, Mr . Lewis was accompanied by Ms . Layman and had the opportunity to meet the personnel responsible for the various areas of technical services (mining, metallurgy and process), exploration and underground geology . A number of open and frank discussions were held regarding the exploration programs, sampling QA/QC procedures, mineral resource modelling and the parameters and procedures used for the mineral resource estimate . Open and frank discussions continued throughout the mineral resource process on all aspects of the process, culminating in completion of the validation of the mineral resource estimate in March, 2024 . The QPs responsible for the preparation of this report and their areas of responsibility and site visits are summarized in Table 2 . 1 . 29 Tintic Project April 25, 2024

Osisko Development Corp. Table 2.1 Qualified Persons, Areas of Responsibility and Site Visits 30 Tintic Project April 25, 2024 Site Visit Area of Responsibility Title and Company Qualified Person September 12 to September 16, 2022 February 5 to February 8, 2024 Sections 1 (except 1.7), 2 to 12, 14.1 to14.4, 14.10 to 14.16 (except 14.12 and 14.14) and 23 to 28 Principal Geologist, Micon William J. Lewis, P.Geo. None Sections 14.5 to 14.9, 14.12 and 14.14 Mineral Resource Specialist, Micon Ing. Alan San Martin, MAusIMM(CP) None Sections 1.7 and 13 Principal Metallurgist Richard Gowans, P.Eng. 15,16,17,18,19,20,21 and 22 NI 43 - 101 Sections not applicable to this report 3. S OURCES OF I NFORMATION Micon’s review of the Tintic Project, and the Trixie deposit in particular, was based on published material researched by the QPs, as well as data, professional opinions and unpublished material submitted by the professional staff of Osisko Development or its consultants . Much of these data came from reports prepared and provided by Osisko Development . The information and reference sources for this report are identified in Section 28 . 0 . The descriptions of geology, mineralization and exploration used in this report are taken from reports prepared by various organizations and companies or their contracted consultants, as well as from various government and academic publications . The conclusions of this report use, in part, data available in published and unpublished reports supplied by the companies which have conducted exploration on the property, and information supplied by Osisko Development . The information provided to Osisko Development was supplied by reputable companies and the QPs have no reason to doubt its validity . Micon has used the information where it has been verified through its own review and discussions . Some of the figures and tables for this report were reproduced or derived from reports on the property written by various individuals and/or supplied to the QPs by Osisko Development . A number of the photographs were taken by Mr . Lewis during his September, 2022 site visit . In cases where photographs, figures or tables were supplied by other individuals or Osisko Development, the source is referenced below that item . Figures or tables generated by Micon are unreferenced . 4. U NITS OF M EASUREMENT AND A BBREVIATIONS All currency amounts are stated in United States of America dollars (USD), unless otherwise stated . Quantities are generally stated in metric units, the standard Canadian and international practice, including metric tonnes (t) and kilograms (kg) for mass, kilometres (km) or metres (m) for distance, hectares (ha) for area, grams (g) and grams per metric tonne (g/t) for gold and silver grades (g/t Au, g/t Ag) . Wherever applicable, US units of measure have been converted to Système International d’Unités (SI) units for reporting consistency, but the US units may be stated in brackets after the metric units . Precious and base metal grades may be expressed in parts per million (ppm) or parts per billion (ppb)

Osisko Development Corp. and their quantities may also be reported in troy ounces (ounces, oz) for precious metals and in pounds (lbs) for base metals, a common practice in the mining industry . The original work on the resource estimate for the Trixie deposit was performed by Osisko Development personnel in the United States and used US units of measurement . For reporting in a Technical Report under Canadian NI 43 - 101 requirements, the US units have been converted to metric units . Table 2 . 2 summarizes the conversion factors from US measurement units to international metric units . Table 2 . 3 provides a list of abbreviations that are used in this report . Appendix 1 contains a glossary of mining and other related terms that are used in this report . Table 2.2 Conversion Factors for this Report 31 Tintic Project April 25, 2024 Metric Measurement US Measurements 0.404686 hectare 1 acre 0.3048 metre 1 foot 0.90718 tonnes 1 ton 31.1035 grams 1 troy ounce 0 degrees Celsius 32 degrees Fahrenheit* *Formula to Convert Fahrenheit to Celsius is ( Σ F − 32) п 5/9 = Σ C Table 2.3 List of Abbreviations Abbreviation Name AAS Atomic Absorption Spectrometry ADR Adsorption/desorption/reactivation ALS ALS Minerals or ALS Geochemistry AALA American Association of Laboratory Accreditation American Drilling American Drilling Corp, LLC. ASTM American Society of Testing Material AusIMM Australasian Institute of Mining and Metallurgy Australian Geostats Australian Geostats Pty Ltd OREAS Australian Ore Research & Exploration P/L Brunton® compass Brunton® Standard Transit compass CANMET Canadian Centre for Mineral and Energy Technology CIM Canadian Institute of Mining, Metallurgy and Petroleum NI 43 - 101 Canadian National Instrument 43 - 101 CSA Canadian Securities Administrators CRD Carbonate replacement deposit CDN Resource CDN Resource Laboratories Ltd. cm Centimetre(s) CP(s) Chartered Professional(s) CCMC Chief Consolidated Mining Co. CRIRSCO Committee for Mineral Reserve International Reporting Standards cfs Cubic feet per second o , o C, o F Degree(s), Degrees Celsius, Degrees Fahrenheit

Osisko Development Corp. Abbreviation Name DSO Deswik Stope Optimizer DEM Digital elevation model DO Dissolved oxygen EDGAR Electronic Data Gathering, Analysis and Retrieval Emerald Hollow Emerald Hollow LLC Florin or FAS Florin Analytical Services LLC Freeport McMoRan Freeport McMoRan Inc. FMMP Freeport - McMoran Mineral Properties Inc. g/t Grams per metric tonne ha Hectare(s) h Hour ID(s) Identification(s) IG Tintic IG Tintic LLC in Inch(es) ICP - ES Inductively Coupled Plasma – Emission Spectrometry IRR Internal rate of return IEC International Electrotechnical Commission ISO International Organization for Standardization Ivanhoe Electric or IVNE Ivanhoe Electric Inc. ID 2 Inverse Distance Squared JORC Joint Ore Reserve Committee KCA Kappes, Cassiday & Associates Kennecott Kennecott Copper Corp. kg Kilogram(s) km Kilometre(s) KNA Kriging neighbourhood analyses Layne Layne Christensen Company LMO Large Mine Operations L Litre(s) LME London Metal Exchange) MMS Matrix matched standard m Metre(s) Micon Micon International Limited M (Mt, Moz, Ma) Million (eg million tonnes, million ounces, million years) mg Milligram(s) mm Millimetre(s) MRE Mineral resource estimate Mountain States Mountain States R & D International NISS Nasco Industrial Services and Supply LLC. NIST National Institute of Standards and Technology NN Nearest Neighbour NPV, NPV8 Net present value, at discount rate of 8%/y NSR Net smelter return NAD North American Datum n.a. Not available/applicable NOI Notice of Intent 32 Tintic Project April 25, 2024

Osisko Development Corp. Abbreviation Name OK Ordinary kriging OREAS Ore Research and Exploration Pty Ltd. Osisko Bermuda Osisko Bermuda Ltd. Osisko Development or ODV Osisko Development Corp. Osisko Gold Royalties Osisko Gold Royalties Ltd. oz, oz/y Ounces (troy)/ounces per year ppb, ppm Parts per billion, part per million % Percent(age) QP Qualified Person QA/QC Quality Assurance/Quality Control Qualitica Consulting Qualitica Consulting Inc. RC Reverse Circulation ST Short tons (US) SG Specific gravity km 2 Square kilometre(s) SRM(s) Standard Reference Material(s) Sunshine Mining Sunshine Mining Corporation SEDAR System for Electronic Document Analysis and Retrieval Talisker Talisker Exploration Services Inc. 3D Three - dimensional TCM Tintic Consolidated Metals LLC. Tintic Utah Metals or TUM Tintic Utah Metals LLC. t, t/d, t/h Tonne (metric), tonnes per day, tonnes per hour t - km Tonne - kilometre 2D Two - dimensional USD United States Dollar(s) EPA US Environmental Protection Agency USGS US Geological Survey SEC US Securities and Exchange Commission UTM Universal Transverse Mercator UT Utah DWQ Utah Department of Water Quality DOGM Utah Division of Oil, Gas and Mining y Year 33 Tintic Project April 25, 2024 5. P REVIOUS T ECHNICAL R EPORTS Osisko Development has published two previous Technical Reports on the Tintic Project :  NI 43 - 101 Technical Report, Initial Mineral Resource Estimate for the Trixie Deposit, Tintic Project, Utah, United States of America, for Osisko Development Corp . by William J . Lewis P . Geo . , Ing . Alan J . San Martin, MAusIMM(CP), Richard Gowans, P . Eng . , with a report date of January 27 , 2023 and an effective date of January 10 , 2023 . The report was filed on SEDAR .  Technical Report on the Tintic Project, East Tintic Mining District, Utah County, Utah, USA, for Osisko Development Corp . by Dr . Thomas A . Henricksen, dated June 7 , 2022 , and filed on SEDAR June 10 , 2022 .

Osisko Development Corp. 3.0 RELIANCE ON OTHER EXPERTS In this Technical Report, discussions in Sections 1 . 0 and 4 . 0 regarding royalties, permitting, taxation and environmental matters are based on material provided by Osisko Development . The QPs and Micon are not qualified to comment on such matters and have relied on the representations and documentation provided by Osisko Development for such discussions . All data used in this report were originally provided by Osisko Development . The QPs have reviewed and analyzed these data and have drawn their own conclusions therefrom . The QPs and Micon offer no legal opinion as to the validity of the title to the mineral concessions claimed by Osisko Development and have relied on information provided by Osisko Development . Osisko Development has confirmed to Micon that it verified the status of the mineral title to certain patented mining claims by engaging Utah legal counsel, Holland and Hart LLP, to conduct a review of Osisko Development’s chain of title for the select patented mining claims within the land package covering approximately 243 ha ( 600 acres) surrounding the Trixie and Burgin mines . Holland and Hart LLP conducted its title review by examining the United States Bureau of Land Management records, including the patents issued by the United States, mineral survey and master title plans, and the official records of the Utah County Recorder’s Office, including the abstract (tract), mining claims, and grantor/grantee indices, among miscellaneous other records . This consolidated land position has been acquired over a hundred years of prior consolidation in the district . Osisko Development also engaged with Wolcott LLC, an independent consultant, to conduct field checks and generate a geospatial database for the mineral claims . Information related to royalties, permitting, taxation and environmental matters has been updated by Osisko Development through personal communication with the QPs . Previous NI 43 - 101 Technical Reports, as well as other references, which were used in the compilation of this report are listed in Section 28 . 0 . 34 Tintic Project April 25, 2024

Osisko Development Corp. 1. PROPERTY DESCRIPTION AND LOCATION 2. G ENERAL D ESCRIPTION AND L OCATION The Tintic Project is located predominantly in western Utah County with a small portion of the property located in eastern Juab County in an area historically known as the East Tintic District . The property is located immediately east of the incorporated town of Eureka, approximately 64 kilometres (km) south of Provo, Utah and 95 km south of Salt Lake City . Figure 4 . 1 shows the Project location within the state of Utah . The coordinates of the centre of the Project are 407 , 700 mE and 4 , 423 , 400 mN, referenced in NAD 83 , Northern UTM Zone 12 . The Project area is located on Eureka Quadrangle, US Topographic Map 1 : 24 , 000 scale, 7 . 5 Minute Series . The nearest rail siding, in use, is located at Tintic Junction, approximately 10 km west of the Project . Figure 4.1 Location Map for the Tintic Project Figure provided by Osisko Development. 35 Tintic Project April 25, 2024

Osisko Development Corp. 2. L AND T ENURE , A GREEMENTS , M INERAL R IGHTS AND O WNERSHIP 1. Property Area The area of the Tintic Project owned or controlled by Osisko Development comprises 1 , 370 claims totalling 7 , 601 . 32 ha ( 18 , 783 . 246 acres) of patented mining claims (Figure 4 . 2 ), and a further 110 unpatented mining claims of approximately 731 . 41 ha ( 1 , 807 . 346 acres) (Figure 4 . 3 ) . Figure 4 . 2 displays the Tintic property outline within the East Tintic District . Osisko Development leases or owns a small and varying percentage interest or royalty in several other claims outside the main claim package and these are shown as leased on the map in Figure 4 . 3 . Figure 4 . 4 displays the individual patented claims over which Osisko Development owns a 100 % interest in both the surface and mineral rights . Figure 4 . 5 displays the individual patented claims for which Osisko Development has purchased the net smelter and milling royalties . 2. Acquisition of the Tintic Project On May 30 , 2022 , Osisko Development announced the acquisition of 100 % of Tintic Consolidated Metals LLC (TCM) (the “ Acquisition ”) from IG Tintic LLC (IG Tintic) and Chief Consolidated Mining Co . (CCMC) (the “ Vendors ”), for total consideration at closing of approximately USD 177 million in cash and shares of Osisko and : 36 Tintic Project April 25, 2024 iii. i. USD 12.5 million in deferred payments ii. Two 1% NSR royalties, each with a 50% buyback right in favour of Osisko Development exercisable within 5 years; and other contingent payments, rights and obligations. Osisko Development entered a metals purchase and sale agreement (“ Stream ”) with Osisko Bermuda Limited . (“ Osisko Bermuda ”) for total cash consideration of USD 20 million . Under the Stream, Osisko Development will deliver to Osisko Bermuda Ltd . , a wholly owned subsidiary of Osisko Gold Royalties, 2 . 5 % of all metals produced from Tintic at a purchase price of 25 % of the relevant spot metal price . Once 27 , 150 ounces of refined gold have been delivered, the Stream rate will decrease to 2 . 0 % of all metals produced . The proceeds from the Stream are to be used to advance the development of the Tintic Project .

Osisko Development Corp. Figure 4.2 TCM Property Outline within the East Tintic District Figure provided by Osisko Development. 37 Tintic Project April 25, 2024

Osisko Development Corp. Figure 4.3 Tintic Project Individual Claims Map Figure provided by Osisko Development. 38 Tintic Project April 25, 2024

Osisko Development Corp. Figure 4.4 Tintic Project Surface Ownership Figure provided by Osisko Development. 39 Tintic Project April 25, 2024

Osisko Development Corp. Figure 4.5 Tintic Project Net Smelter and Milling Royalty Purchase Figure provided by Osisko Development. 40 Tintic Project April 25, 2024

Osisko Development Corp. 4.2.3 Title, Mineral and Surface Rights Summary and Royalties As displayed in Figure 4 . 4 , Osisko Development acquired surface rights over approximately 243 ha ( 600 acres) surrounding the historical Trixie and Burgin historical mines . The patented claims over which these surface rights were acquired are listed in Table 4 . 1 and Table 4 . 2 . Osisko Development has also entered into an agreement with the owner of the surface rights over the remaining patented claims within the Tintic Project pursuant to which it has an option to acquire further surface rights at prevailing market rates, to construct mining infrastructure as needed . Osisko Development has agreed all necessary easements with the surface rights owner for water, transportation and infrastructure access to the mine site . As part of the Acquisition, two 1 % net smelter return royalties (NSRs) were granted, each with a 50 % buyback right in favour of Osisko Development, each for USD 7 . 5 million within 5 years . The NSRs were granted to IG Tintic and Emerald Hollow LLC (Emerald Hollow) . The state of Utah is entitled to a 0 . 78 % mining severance tax . There are no further underlying royalty or other property payments owed to any third party on the TCM property, other than those described above . Table 4.1 Trixie Mineral Claims 41 Tintic Project April 25, 2024 A Portion of Sections Range Township Patent No. Survey No. Name* 28: NE¼ R2W T10S 1006490 6766 Cameo #27 28: NE¼ R2W T10S 959091 6574 Cedar 28: NE¼ R2W T10S 959091 6574 Cedar No. 1 27: NW¼ 28: NE¼ R2W T10S 993922 6737 Cedar No. 4 21: SE¼ 28: NE¼ R2W T10S 397059 6091 East Point #5 21: SE¼ 28: NE¼ R2W T10S 1108693 7138 Rose 27: NW¼ 28: NE¼ R2W T10S 214588 6073 Trixy 28: NW¼ R2W T10S 214588 6073 TRUMP 21: SE¼ 28: NE¼ R2W T10S 925953 6456 Vern No. 2 27: NW¼ 28: NE¼ R2W T10S 1006490 6766 White Rose No. Four 21: SE¼ R2W T10S 1006490 6766 White Rose No. 5 Amended 21: SE¼ 28: NE¼ R2W T10S 1006490 6766 White Rose No. Six 21: SE¼ R2W T10S 1006490 6766 White Rose No. Seven *Owns all right, title, and interest (100%) interest in the surface and mineral estates.

Osisko Development Corp. Table provided by Osisko Development. Table 4.2 Burgin Mineral Claims 42 Tintic Project April 25, 2024 A Portion of Sections Range Township Patent No. Survey No. Name 15: SE¼ 22: NE¼ R2W T10S 915159 6560 Christmas 15: SE¼ 22: NE¼ R2W T10S 915159 6560 Christmas No. 1 15: SE¼ R2W T10S 915159 6560 Detective No. 5 15: SE¼ R2W T10S 915159 6560 Detective No. 7 15: SE¼ 22: NE¼ R2W T10S 915159 6560 Sunny Side No. 1 15: SE¼ 22: NE¼ R2W T10S 1038307 6784 Climax #1 15: SE¼ R2W T10S 1038307 6784 Climax #2 11: SW¼ 14: NW¼ 15: SE¼ R2W T10S 1038307 6784 Eastern No. 2 14: NW¼, SW¼ 22: NE¼ R2W T10S 945099 6752 Zenith No. 1 14: NW¼ 22: NE¼ R2W T10S 945099 6752 Zenith No. 19 14: NW¼ R2W T10S 1038307 6784 Eastern No. 10 11: SW¼ 14: NW¼ R2W T10S 1038307 6784 Eastern No. 11 14: NW¼ 15: SE¼ 22: NE¼ R2W T10S 1038307 6784 Eastern No. 3 14: NW¼ SW¼ R2W T10S 1038307 6784 Eastern No. 4 14: NW¼, SW¼ R2W T10S 1038307 6784 Eastern No. 7 14: NW¼ R2W T10S 1038307 6784 Eastern No. 8 11: SW¼ 14: NW¼ R2W T10S 1038307 6784 Eastern No. 9 14: NW¼ R2W T10S 1039439 6785 Eastern No. 12 11: SW¼ 14: NW¼ R2W T10S 1039439 6785 Eastern No. 13 11: SW¼ 14: NW¼ R2W T10S 1039439 6785 Eastern No. 14 14: NW¼ R2W T10S 1039439 6785 Eastern No. 15 14: NW¼ R2W T10S 1039439 6785 Eastern No. 17 14: NW¼, SW¼ R2W T10S 1042410 6801 Inez No. 3 15: SE¼ R2W T10S 971242 6466 Wonderer No. X6 15: SE¼ R2W T10S 971242 6466 Wonderer No. X5 11: SW¼ 15: SE¼ R2W T10S 971242 6466 Wonderer AMND *Owns all right, title, and interest (100%) interest in the surface and mineral estates. Table provided by Osisko Development.

Osisko Development Corp. 3. E NCUMBRANCES AND O THER S IGNIFICANT F ACTORS OR R ISKS 1. Encumbrances Pursuant to the Stream Agreement, Osisko Bermuda has a first ranking security interest over all of the present and future assets of TCM . Permitting of the Trixie test mine is well advanced, with many project components already permitted and bonded by the Utah Division of Oil, Gas and Mining (DOGM) . These include the Trixie shaft and surface facilities . Full development of the Trixie test mine will require a number of additional Agency approvals, none of which is anticipated to be problematic to obtain . 2. Other Significant Factors and Risks On closing of the Acquisition, Osisko Development entered into a Framework Agreement with Emerald Hollow, the entity which retained ownership of the water rights and the majority of the surface rights over the Tintic Project, executed at closing and dated effective May 27 , 2022 (the “Framework Agreement”) . Under the Framework Agreement, Osisko Development has the right to conduct exploration activities and has agreed easements to use the surface rights owned by Emerald Hollow . Osisko Development also has the right to purchase surface rights from Emerald Hollow at market rates if it has reasonably determined that actual use and occupation of such lands for facilities for more than eighteen ( 18 ) months are necessary for economic exploitation of proven or probable reserves or measured, indicated, or inferred resources . Osisko Development has also retained a right of first offer in the event that Emerald Hollow desires to sell, assign, or otherwise transfer to a third party all or a portion of its interest in the surface rights it owns, as well as a first priority right to purchase from Emerald Hollow, at a price based on prevailing market rates, a maximum annual water flow rate of 2 . 45 cubic feet per second (cfs) and a maximum annual volume of 1 , 776 . 64 acre - feet of water from Emerald Hollow for its mining activities . There are no other known significant factors and risks that may affect access, title, or the right or ability to perform work on the property . 4. P ERMITTING AND E NVIRONMENTAL L IABILITIES 1. Environment TCM maintains adequate financial surety of USD 1 , 473 , 167 with the Utah DOGM . This financial surety was last updated in August, 2021 with the addition of a pilot process operation . TCM is currently in the process of updating its large mine permit with Utah DOGM and expects the surety to be updated as part of this process . TCM maintains all necessary environmental permits to operate within the Tintic operations area, including the current large mine permit update . As part of this update, environmental resources within the Tintic Project were reviewed . As of the date of this report, all water rights and other water sources 43 Tintic Project April 25, 2024

Osisko Development Corp. have been secured and agreed upon . Furthermore, the US Fish and Wildlife Service has deemed that this area does not contain areas of critical wildlife concern . There are no other known significant factors and risks that may affect access, title, or the right or ability to perform work on the property . 4.4.2 Permits and Environmental Liabilities TCM is working under the Notice of Intent (NOI) to Commence Large Mine Operations (LMO) plan permit MO 490062 , originally approved by Utah DOGM in in 2017 , with an update submitted in October, 2023 and tentatively approved on November 10 , 2023 . The Utah DOGM has indicated it will issue final approval of the revised NOI upon fulfillment of certain changes to the submitted plans and bond calculations, which TCM is currently addressing . TCM has exploration permits in place (i . e . , surety bonding) to support surface diamond drilling and the excavation of the decline at the Trixie test mine . Once approved, the exploration for the decline will fall within the updated LMO permit . Under agreement with the Utah DOGM and the Permit by Rule (PBR) was issued by the Utah Department of Water Quality (DWQ) on July 28 , 2021 (DWQ - 2021 - 013316 ), and TCM was originally permitted to operate a pilot - scale processing facility and a tails holding pad . On December 12 , 2023 , the DWQ issued Ground Water Discharge and Construction Permit (Permit No . UGW 490011 ), which permits conversion of the pilot - scale facilities into an expanded, full - scale operation, including a Heap Leach Facility and associated Solution Collection Pond, with a leak collection and removal system . TCM does not discharge any water or effluents from current operations and does not anticipate discharging from expanded operations . Groundwater at the site is more than 1 , 000 feet below surface, and there are no perennial water bodies (seeps, springs, ponds, etc . ) within a one - mile radius . 4.5 QP C OMMENTS Micon and the QPs are not aware of any significant factors or risks, other than those discussed in this Technical Report, that may affect access, title, or the right or ability to perform work on the property by Osisko Development . It is Micon’s and the QPs’ understanding that further permitting and environmental studies will be required, if further exploration, test mining and economic studies demonstrate that the mineralization is sufficient to host a mining operation . The area of the Tintic Project is large enough to be able to locate and accommodate the infrastructure necessary to host any future mining operations, if Osisko Development advances the Trixie test mine towards a production decision . 44 Tintic Project April 25, 2024

Osisko Development Corp. 1. ACCESSIBILITY, CLIMATE, LOCAL RESOURCES, INFRASTRUCTURE AND PHYSIOGRAPHY 2. A CCESSIBILITY The closest major airport to the Tintic Project is in Salt Lake City, Utah, located to the north - northwest of the city of Provo, via Interstate 15 . Access to the Tintic Project from Provo, is via Interstate 15 , a distance of 36 km south to exit 248 to US 6 , then west on US 6 for 27 km to Silver Pass Road, and then south 3 . 2 km to the Burgin administration office site . The Trixie test mine is located 2 . 6 km southwest of the Burgin office on the paved Silver Pass Access Road ( Figure 5 . 1 ) . Provo is the fourth largest city in Utah, and other smaller towns, including Payson, Santaquin and Eureka are also adjacent to the Project . Figure 5.1 Overview of the Trixie Test Mine looking towards the Northeast Figure provided by Osisko Development. 5.2 I NFRASTRUCTURE AND L OCAL R ESOURCES The towns of Goshen, Santaquin, Payson and Provo are the main sources for supplies and services . Tintic Project personnel and contractors also live in these areas . The Project has sufficient power and water to support a mining operation . The nearest perennial surface water body is Utah Lake, which is located approximately 14 km northeast of the Project area . Three small perennial springs discharge from perched ground water in the upper portion of the volcanic cap rocks at an elevation of 1 , 950 m, on the western slope of the upper Silver Spring Pass Canyon drainage . Perennial flow is limited to short reaches below these springs . The company anticipates that 45 Tintic Project April 25, 2024

Osisko Development Corp. additional water will be available for the Project from various surface and underground water sources, pursuant to written agreements with the owners of water rights in the vicinity . A 46 kVA high tension power line owned by Rocky Mountain Power crosses the property near the Burgin administrative complex . The installation of new transformers and electrical infrastructure to service both the Trixie test mine and the Burgin administrative complex was completed by TCM in December, 2021 , with peak load usage up to 4 . 5 MW . Estimated peak load power requirement for Trixie is 3 MW . 3. T OPOGRAPHY , P HYSIOGRAPHY , V EGETATION AND C LIMATE Topographic relief in the East Tintic District ranges from 1 , 494 m in the Goshen Valley east of the District to 1 , 996 m at nearby Mineral Hill . The elevation at Trixie is 1 , 852 m . The Tintic Mountains host the scanty vegetation typical of an arid region . Different species of cactus, forbs and shrubs grow on exposed rocky points . The more common trees of the higher slopes are pinyon pine, juniper and mountain mahogany . At lower elevations, maple thickets occur in the dry ravines, especially on the eastern slopes, while aspens are found in sheltered spots, more commonly those of northern exposure . In the valleys, sagebrush, rabbitbrush, Brigham’s tea and cheat grass constitute almost the entire vegetation . Range improvement projects in the area have had some effect on improving grazing . The climate of the East Tintic District is semi - arid . The U . S . Climate data website ( https : //www . usclimatedata . com/climate/elberta/utah/united - states/usut 0068 ) noted that the mean monthly low temperatures at the nearby town of Elberta range from - 10 degrees ( Σ ) Celsius (C) or 15 Σ Fahrenheit (F) in January to 15 Σ C ( 58 Σ F) in July . The mean monthly high temperatures range from 2 Σ C ( 37 Σ F) in January to 33 Σ C ( 93 Σ F) in July . The Project has year - round access and operating season . 4. S ITE F ACILITIES The Project’s main office, laboratory, workshops and onsite processing facilities are located at the Burgin site, immediately off Highway 6 and northeast of the Trixie test mine ( Figure 5 . 2 ) . The Burgin mine is a past - producing underground operation containing lead - zinc - silver ores that was last mined by Kennecott in 1976 . All references to Burgin in this report are with respect to the main office and surface facilities located at this site, and not to the Trixie test mine or deposit, unless otherwise specified . The development of an underground ramp commenced in July, 2022 and was completed to the 625 level at Trixie during Q 3 2023 , with the breakthrough occurring at the end of September . The company anticipates that the decline ramp will improve underground access for exploration and may potentially support an increase in productivity and mining rates in the future . A mill facility previously operational in 2002 is located at the Burgin site . In October, 2021 , a pilot vat leaching circuit was established within the old Burgin mill facility for cyanide vat leaching of the mineralized material from the Trixie test mine . Osisko Development’s recent operations also included trucking mineralized material to an offsite facility for vat and heap leaching from late 2020 to May, 2022 . 46 Tintic Project April 25, 2024

Osisko Development Corp. Figure 5.2 Burgin Site Infrastructure Figure provided by Osisko Development. In 2022 , a pilot dry stack tailings facility was constructed on site adjacent to the mill facility . This facility was designed and installed with a double liner for future re - permitting and operation as a heap leach facility . The groundwater discharge permit for this facility to function as a heap leach was issued in December 2023 , one additional required permit is in review . Test milling designs in the Burgin mill building have been considered through 2023 , to further demonstrate the leach recovery results from the pilot vat leach facility in operation through late 2022 . There is a tailings facility north of the processing facilities which is intended to support tailings storage for a potential future Burgin Test Mill . Both pilot milling facilities and pilot heap leach facilities have been considered to further demonstrate the leach recovery results observed in the pilot vat leach facility in operation through late 2023 . There is a separate dry stack facility designed and in permit review to the north of the processing facilities which is intended to handle finely comminuted tailings such as those from a milling process . Current efforts are primarily focused on developing the heap leach plan, including the above - mentioned re - permitting, and engineering of peripheral components of the heap leach facility . The onsite laboratory at the Burgin site provides fire assay analysis for gold and silver for all underground grade control sampling from the Trixie test mine . Atomic Absorption Spectrometry (AAS) and bottle roll analysis to complement onsite VAT leaching and processing have also been established . Using an onsite laboratory to assay samples generated on site is common practice in the mining industry . Onsite laboratories usually participate in round robin exercises with government or independent laboratories as part of their QA/QC programs . In addition, onsite laboratories, such as the Burgin site, usually send out check samples and engage laboratory auditing consultants to independently review their procedures . The mineral property is sufficiently large that construction of further infrastructure at the Project will not be hindered by lack of space . 47 Tintic Project April 25, 2024

Osisko Development Corp. 1. HISTORY 2. I NTRODUCTION Much of the material in this section is taken from the Chief Consolidated Mining Retrospect and Prospect 2005 Report . The mines, resources and reserves quoted in this section are historical in nature and should not be relied upon . It is unlikely that any of the resources or reserve estimates would comply with current NI 43 - 101 criteria or CIM Standards and Definitions . Historical resource and reserve estimates included in this section are for illustrative purposes only and should not be disclosed out of context . The QP did not review the database, key assumptions, parameters, or methods used for the historic mining on the East Tintic District, as they are no longer available or were never recorded . 2. T INTIC D ISTRICT – E ARLY M INING H ISTORY (1869 TO 2002) Economic mineralization in the Tintic District was first discovered in 1869 and, within a few years, most of the major outcropping ore bodies were being mined and many of the historic mining towns, including Diamond, Silver City, Mammoth, Eureka, Dividend and Knightsville had been established (Krahulec and Briggs, 2006 ) . By 1899 , the Tintic District had become one of the richest mining districts in the USA . Active mining in the district continued through the 20 th and beginning of the 21 st century . Major replacement type ore bodies were discovered along three main structures known as the Gemini, Mammoth - Chief and Godiva ore runs . In 1905 , a fourth ore run which was not outcropping, the Iron Blossom, was discovered by Jesse Knight . This “blind” discovery by Knight, some distance east of the outcropping ore runs, opened the possibility of further deposits to the east ( Figure 6 . 1 ) . 1. East Tintic District Even though many of the claims in what is now identified as the East Tintic District had been staked before the turn of the 20 th century, the only known occurrence of surface mineralization was in a small outcrop near where the Eureka Lilly shaft was eventually sunk . All future discoveries of the blind ore bodies in the East Tintic District would be based on surface alteration and underground geological interpretation . The following is a brief summary of the discovery and development of several of the important mines within the East Tintic District . 1. Tintic Standard Mine E . J . Raddatz became interested in the East Tintic District around 1906 and acquired a major holding in what is now the Tintic Standard area . Raddatz reasoned that, even though the surface rocks were inhospitable, there was a chance of discovery in the Ophir limestone at depth . It took two shafts and thousands of feet of drift and winze workings but, in 1916 the Tintic Standard deposit was discovered and during its production years, between 1918 and 1949 , it attained worldwide prominence . The deposit is characterized by large volumes of carbonate replacement lead - silver ore emplaced along the faulted contact between the underlying Tintic Quartzite and the overlying Ophir formation . Starting in 1940 and through World War II, some mining was focused on the copper - gold ore present within breccias and veins hosted in the underlying Tintic Quartzite in the lower levels of the mine . However, 48 Tintic Project April 25, 2024

Osisko Development Corp. these structures were never explored beneath the water table and, in 1949, the mine was closed, having reached the limits of its economic production. Figure 6.1 Overview of the Major Historic Mineral Deposits of the Tintic District Figure provided by Osisko Development. 49 Tintic Project April 25, 2024

Osisko Development Corp. 2. Eureka Lilly Mine Sinking of the Eureka Lilly shaft began in 1906 after ore was discovered nearby at Lilley of the West mine . During the first decade of the mine’s existence focus was directed on relatively small volume of lead - silver + - zinc carbonate replacement mineralization within a few hundred feet of surface . Exploration efforts from 1916 to 1921 were concentrated primarily and unsuccessfully on locating an extension of the Tintic Standard main orebody . The shaft was eventually deepened to 484 m ( 1 , 526 ft) and, from the late 1930 ’s to mine closure in 1949 , mining was focused on the copper and gold rich ore hosted in the breccias and veins along the South Fault and sub parallel structures . 3. North Lily Mine In 1927 Paul Billingsley, who theorized from careful observations of the altered volcanic rocks and structural studies of the dikes and fissures cutting them that an ore body like that at the Tintic Standard Mine existed at North Lily . Based on these ideas, a long, northwesterly drive on the 700 level of the Tintic Standard mine was commissioned . This exploration work intersected the mineral deposit that became the North Lily mine . The mine was primarily focused on the extraction of lead - silver replacement ore localized within the Ophir formation where it is in faulted contact with the underlying Tintic Quartzite . Lesser amounts of ore were extracted from several gold and copper rich breccias and veins which are hosted in the underlying Tintic Quartzite . Mining operations ceased in 1949 when economic conditions were no longer favourable . 4. Eureka Standard Mine The sinking of the Eureka Standard shaft was undertaken in 1923 after geologic studies indicated that a structural trough existed at depth, similar to what is seen at Tintic Standard . High - grade gold - silver ore was first intersected in 1928 on the 1100 ft level with the first shipment of ore averaging 0 . 77 oz/t Au and 10 . 58 oz/t Ag (Morris and Lovering, 1979 ) . Mining of the ore shoots was largely constrained by economic factors such that no significant mining was conducted above the 1000 ft level where the shoots diminished in size and grade (Morris and Lovering, 1979 ) . Mining was terminated at the lower levels of the mine due to inflows of water at and below the contemporary water table . Production from the mine peaked in 1934 and had ceased completely by 1940 . 5. Apex Standard Mine The workings of the Apex Standard mine were started in 1908 with the sinking of the number one shaft, which is thought to have been seeking the eastern extension of the Sioux - Ajax Fault (Morris and Lovering, 1979 ) . The number two shaft was sunk in 1923 and was eventually deepened to the 1100 ft level following the discovery and northeastward continuity of ore in the Eureka Standard mine . Exploration and mining were focused along the Eureka Standard Fault and the Middle Fault, both of which host mineralization, although at a lower average grade than the ore extracted from the nearby Eureka Standard mine . Mining operations ceased initially in 1936 but exploration work was briefly restarted in 1948 by Newmont before terminating in 1949 (Morris and Lovering, 1979 ) . 50 Tintic Project April 25, 2024

Osisko Development Corp. 6.2.1.6 Burgin Mine During World War II, the United States recognized that, in the event of a long war, new and domestic sources of raw material would be essential . As a result, the US Geological Survey undertook an exploration program seeking blind ore bodies in the East Tintic District . One of the blind targets identified by the USGS was the CCMC oxide area, a prominent outcrop of oxidized and pyritized volcanics which overlies the Burgin deposit . However, no major discovery was made from either the sinking of the 22 . 6 m ( 75 ft) deep CCMC shaft or the exploration drift from the Apex Standard mine . It was later surface drilling that made the discovery of the Burgin ore body . District production slowly increased through the discovery of new mines and peaked between 1921 and 1930 , when, according to data from the U . S . Bureau of Mines, production for that decade from the combination of the Main Tintic and East Tintic mining districts reached 4 , 250 , 000 tons . From that peak, production decreased to a low of 662 , 000 tons between 1961 and 1970 . Production from the Burgin mine led to a second peak of 1 , 200 , 000 tons between 1971 and 1976 . Total recovered metal from the greater Tintic District is summarized in Table 6 . 1 . 3. T RIXIE – E XPLORATION U NDERGROUND D EVELOPMENT AND M INING (1927 TO 1995) 1. Trixie Early Exploration (Pre - 1957) Following the discovery of the Tintic Standard deposit in 1917 , the North Lily deposit in 1927 and the Eureka Standard deposit in 1928 , interest was sparked over a poorly exposed structure overlying the current location of the Trixie test mine . Two shallow prospecting shafts known as the Trump shaft ( 94 ft or 28 . 5 m deep) and South Standard shaft ( 102 ft or 31 m deep) were sunk but due to their shallow depth, failed to intersect mineralization . Intense hydrothermal alteration of volcanic rocks exposed at surface at the Trixie site attracted the attention of the U . S . Bureau of Mines, which, in 1946 - 1947 , conducted gravimetric and spectrographic surveys, as well as geological studies of the Trixie area . Between 1954 and 1955 the USGS conducted geochemical sampling and geological mapping of the area immediately north of the current Trixie shaft location . This was followed up by the drilling of nine holes that confirmed the presence of the Trixie fault and the validity of the surface geochemical anomalies when low - grade lead - zinc ore was intersected in the Trixie fault zone . After the conclusion of the USGS research program in 1956 , Bear Creek Mining (an exploration subsidiary of Kennecott Copper Corp . (Kennecott)) completed eight additional core holes in the target area and several of these holes intersected strong lead - zinc replacement mineralization in the underlying limestone . Despite the apparent presence of ore - grade mineralization at depth, the disappointing core recoveries resulted in surface exploration work being terminated in 1957 . Subsequently, the decision was made to conduct future exploration from underground . 51 Tintic Project April 25, 2024

Table 6.1 Total Recovered Metal and Production Values from the Tintic District Zinc (Short Tons) Lead (Short Tons) Copper (Short Tons) Silver (Troy Ounces) Gold (Troy Ounces) Ore Treated (Short Tons) Sub - District 69,258 644,750 109,866 207,687,897 2,166,841 13,813,942 Main Tintic 1869 - 1993 178,545 507,981 17,759 75,871,239 658,224 5,982,827 East Tintic 1899 - 2002 115 4,160 585 1,440,370 12,025 122,000 SW Tintic 1869 - 1919 10,654 6,081 - 40,412 8 63,939 North Tintic 1902 - 1955 258,572 1,162,972 128,210 285,039,918 2,837,098 19,982,708 Total 1.29 % 5.82 % 0.64 % 14.26 oz/t 0.142 oz/t Average Grade $3,124 per Short Ton $1,870 per Short Ton $7,746 per Short Ton $20 per Ouncer $1,662 per Ounce Metal Prices as of October, 2022 $807,778,928 $2,174,757,640 $993,114,660 $5,558,278,401 $4,715,256,876 Production value at current price $14,249,186,505 Total Production Table from Krahulec and Briggs, 2006. Tintic Project 52 April 25, 2024

Osisko Development Corp. 6.3.2 Trixie - Shaft Sinking and Underground Development and Mining (1968 to 1992) The sinking of the Trixie shaft was initiated in 1968 and had reached the 750 ft level by 1969 . Although the initial target of exploration at the Trixie historic mine was lead - zinc replacement mineralization in the hanging wall of the Trixie Fault, a gold - bearing structure was encountered during shaft sinking at a depth of 584 ft . This northerly - trending and steeply west - dipping structural zone became the primary source of ore, which was concentrated along three gold - silver mineralized segments . From north to south these ore shoots were referred to as the 756 ore shoot, the 75 - 85 ore shoot, and the Survey zone . The original carbonate replacement deposit (CRD) that was discovered at the Trixie historic mine in 1969 is located on the north end of the deposit, within the downthrown carbonate sequence north of the Trixie fault . While limited in scale, the replacement mineralization consists of massive sulphide minerals and jasperoid that locally enclose irregular blocks of argillized shale and limestone between the 750 ft level and 900 ft level . Metal zonation within the deposit was documented at the time of mining, with the upper levels displaying higher grade zinc and gold values, which diminish down - plunge, while copper and silver values increase at depth and lead concentrations remain consistent throughout (Morris et al . , 1979 ) . The 756 ore shoot represents the most productive of the three historically mined ore zones . This ore shoot was developed up to nine feet in width and over 900 ft in strike length and was mined for over 1 , 000 vertical feet . The shoot plunges to the north towards the Trixie and Eureka Standard faults and was mined continuously from approximately 75 ft above the 625 level to below the deepest 1350 level development . Based on limited historic drilling, the 756 ore shoot continues for at least 300 ft below the 1350 level and remains open at depth . In 1976 , as mining and exploration continued within the 756 mineralized shoot, the 75 - 85 ore shoot was discovered approximately 1 , 600 ft ( 488 m) south of the Trixie shaft . The 75 - 85 ore shoot was mined from approximately 50 ft ( 15 m) above the 625 level down to the 1200 level . In early 1980 , Bear Creek Mining discovered the Survey zone while exploring for the Sioux - Ajax fault by drifting south on the 1050 ft level of the Trixie historic mine . The Survey Vein segment was explored and extensively developed by Kennecott on the 750 , 900 , 1050 and 1200 levels during the pre - 1995 silica flux mining periods . The southern end of the Survey Vein is extended for a distance of 3 , 400 ft south of the main shaft, along the 1050 level and remains open to the south and at depth . In 1980 , Sunshine Mining Corporation (Sunshine Mining) leased the Burgin unit from CCMC and, by 1983 , had also begun work at Trixie, where it re - started mining operations and undertook additional underground development and diamond drilling . Much of the underground development and drilling from this time appears to have been focused on the 900 , 1050 , 1200 and 1350 levels . Perhaps the most notable exploration efforts at Trixie during this time were the southerly extensions of the 900 , 1050 and 1200 ft level drifts following the discovery of the Survey zone and the northeastward extension from the 1350 ft level to connect with the 1100 ft level of the Eureka Standard mine . This connection provided the underground access needed to evaluate the Eureka Standard fault along - strike and down - dip from the original Eureka Standard mine workings . Sunshine Mining operated the Trixie historic mine until terminating its lease with CCMC at the end of 1992 . Tintic Project 53 April 25, 2024

Osisko Development Corp. 6.3.3 Trixie Mine, Diluted Grade Production Between 1969 and 1995 , the historic Trixie mine was operated as a source of silica flux ore for direct shipment to Kennecott’s Bingham Canyon smelter . Payments were received for gold, silver and variably for copper . Production from 1969 through to 1992 totaled 808 , 240 tons, containing 159 , 289 oz of gold and 4 . 75 million oz of silver . Ore mined during this period was heavily diluted (as much as 3 : 1 ) with footwall and hanging wall Tintic Quartzite . Open stope mining methods and poor ground control practices appeared to be only partially responsible for the dilution of ore . Production of 100 tons per day was required from the historic Trixie mine to provide a precious metal - rich silica flux ore to Kennecott’s Bingham Canyon smelter . Since the Tintic Quartzite was as good a source of silica flux as the mineralized quartz veins themselves, dilution of the Trixie ore with Tintic Quartzite was a deliberate practice to obtain the daily tonnage requirements . A diluted mining grade of 0 . 15 to 0 . 3 oz/t Au during this time was an optimal grade to obtain the required tonnage for the Bingham Canyon smelter, covering the cost of extraction and shipping of the silica flux . As a result of a settlement of litigation between the then - operator Sunshine Mining and CCMC, underground mining at the Trixie operation ceased in 1992 . CCMC mined and shipped some low - grade surface stockpile material for smelter flux between 1993 and 1995 , but with changes to Kennecott’s smelting process in 1995 , its Garfield smelter no longer required Trixie flux ore . There were other western smelters with requirements for high - silica metals - bearing flux, but the costs of transportation to these smelters, coupled with low ore prices reduced the overall profit potential of mining the Trixie and other known silica - hosted precious metal deposits in the East Tintic District . 6.4 T RIXIE E XPLORATION AND P RODUCTION (2000 TO 2002) Between 2000 and 2002 , CCMC (through its affiliate Tintic Utah Metals LLC (Tintic Utah Metals)) undertook an aggressive surface and underground drilling program at Trixie, resulting in the discovery of a small - tonnage gold - silver resource associated with the earlier mined 75 - 85 mineralized zone . In the case of the gold - silver resource, a new level (the 625 ft level) was developed within the mine in 2001 , and approximately 11 , 120 tons of gold - silver ore, averaging 0 . 66 oz/t Au, were produced before mining was suspended due to the decrease in the price of gold below $ 300 /oz and CCMC’s financial and reported management problems . Table 6 . 2 summarizes the production from the Trixie mine from before 1883 to 2002 . Tintic Project 54 April 25, 2024

Osisko Development Corp. Tintic Project 55 April 25, 2024 Table 6.2 Trixie Mine Historic Production Summary Silver Total (Troy Ounces) Gold Total (Troy Ounces) Average Silver Grade (Oz/ST*) Average Gold Grade (Oz/ST*) Short Tons Sold Operating Company Year 3,533,950 102,713 6.95 0.2 508,482 Bear Creek Mining Co. Pre 1983 8,333 516 4.8 0.3 1,736 Sunshine Mining Co. 1983 68,382 1,710 6 0.15 11,397 Sunshine Mining Co. 1984 89,128 6,487 3.49 0.25 25,538 Sunshine Mining Co. 1985 - - - - 0 Sunshine Mining Co. 1986 11,852 627 4.69 0.25 2,527 Sunshine Mining Co. 1987 160,086 6,716 7.08 0.3 22,611 Sunshine Mining Co. 1988 230,429 9,070 7.13 0.32 28,343 Sunshine Mining Co. 1989 207,706 8,159 6.68 0.27 31,115 Sunshine Mining Co. 1990 201,418 7,486 4.96 0.18 40,608 Sunshine Mining Co. 1991 167,531 6,488 3.35 0.13 50,002 Sunshine Mining Co. 1992 49,342 1,944 0.66 0.026 74,761 South Standard Mining Co. 1993 - 1995 - - - - 0 Chief Consolidated Mining 1995 - 2001 26,577 7,373 2.39 0.663 11,120 Chief Consolidated Mining 2002 4,754,734 159,289 5.85 0.196 808,240 Total Table supplied by Osisko Development but originally prepared by Tom Gast for CCMC, October 2010. *ST = US Short Tons

Osisko Development Corp. 5. T RIXIE , E XPLORATION AND P RODUCTION (2019 TO 2021) 1. TCM – Trixie, Modern Target Generation (2019 to 2020) TCM acquired the historic Trixie mine at the beginning of 2019 , and initially focused its assessment on the base - metal resource opportunity at the Burgin mine . However, high - grade gold opportunities that had potential for near - term production and revenue from the Trixie mine quickly became the focus of the company . A preliminary economic report dated 2010 indicated the presence of known and documented resource opportunities at the Trixie mine, though these required in - depth evaluation and additional work to quantify . Since most of the historic mining was focused on the steep west - dipping structural corridor with very little development or exploration into either the footwall or hanging wall, there was high potential to define additional mineralized structures in close proximity to the existing underground infrastructure . The historic Trixie mine together with the entire East Tintic property had been in a state of care and maintenance followed by near abandonment, since 2014 , and this resulted in wide - spread vandalism and damage to the property and physical assets . This included destruction of the primary hoist, hoist foundation and building at Trixie that was used to operate the conveyance and provide access to the underground development . In August, 2019 , TCM made the decision to commence rehabilitation of the historic mine and shaft), with the intention of beginning underground drilling and exploration of documented targets on the historic 625 ft and 750 ft development levels . Figure 6.2 Trixie Headframe Micon 2022 site visit photograph. 56 Tintic Project April 25, 2024

Osisko Development Corp. By December, 2019 , TCM had compiled the historic Trixie datasets into a new 3 D model of the deposit and identified a significant new target in the immediate footwall to the 610 stope . This new target, initially termed the North Survey Vein, was developed from reconsidering assays within historic surface RC holes which could not have originated from any of the historically mined areas ( Figure 6 . 3 ) . Further investigation of this target lead to the discovery of the T 2 and T 4 structures . Figure 6.3 Cross - Section, Looking North, of the Surface RC Hole Intersections that Led to Discovery of the T2 Structure Figure provided by Osisko Development. The broad zones of mineralization encountered in the 2000 - 2001 surface RC drilling were originally interpreted to be caused by the smearing of mineralization within the holes, given that the known mineralized structures were typically no more than six to eight feet in width . However, exploration work by TCM in 2021 demonstrated that, locally, mineralization up to 60 ft in width is associated with stockwork veining in the footwall of the 75 - 85 structure which would come to be known as the “T 4 ” zone . 6.5.2 TCM T2 Discovery (2020 to 2021) Between February and June, 2020 , refurbishment of the 625 level was completed by TCM with new services installed to commence underground diamond drilling . A total of five diamond drill holes were completed between June and August, 2020 , all collared from the only suitable drilling position, just north of the ventilation shaft . 57 Tintic Project April 25, 2024

Osisko Development Corp. Despite extremely difficult drilling conditions, visible mineralization within the footwall of the 610 stope was confirmed in three of the five holes . With the visual confirmation of the mineralization and structure a decision was made by TCM management to commence development of an exploration drift eastward towards the target zone . This exploration drift would open - up the target structure for sampling and visual examination, as well as opening up more favourable positions from which to drill on the east side of the 610 stope . The decision to develop into the target zone by TCM management proved extremely fortuitous . Only 13 m ( 44 ft) east of the historic 625 ft level development, TCM drifted directly into the T 2 structure . The first three grab samples taken returned 1 , 234 g/t Au ( 36 oz/t Au), 1 , 947 g/t Au ( 56 . 8 oz/t Au) and 5 , 417 g/t Au ( 158 oz/t Au) . Figure 6 . 4 shows one of the earliest underground mining faces on the T 2 structure, with composite chip sampling across the face returning 2 . 4 m of 3 , 497 g/t Au and 6 , 583 g/t Ag ( 8 ft of 102 . 0 oz/t Au and 192 oz/t Ag) . Figure 6.4 An Early Mining Face on the T2 Structure Looking North Figure provided by Osisko Development . Abundant visible gold associated with the striking green colour of the mineralized zone aided the visual identification and mining of the T 2 structure . Initial mining continued north and south on - strike of the steeply east - dipping structure to determine potential strike lengths of the mineralized zone . At the same time the original 609 exploration cross - cut was extended further eastward to test ground immediately east of the T 2 structure for further mineralization . Together with additional diamond drilling and exploration cross - cuts, a zone containing several mineralized structures and local stockwork veining up to 25 metres ( 80 ft) in width was identified, referred to as the T 4 zone of mineralization . 58 Tintic Project April 25, 2024

Osisko Development Corp. Figure 6 . 5 displays an overview of the historic mine development and new mining completed by TCM between 2020 - 2021 , with the T 2 and T 4 development located only 13 m ( 44 ft) east of the historic mine infrastructure on the 625 level . Figure 6.5 Overview Map of the Southern End of 625 ft Level Figure provided by Osisko Development. 6.5.3 TCM Underground Development and Mineral Processing (2020 to 2021) In November, 2020 the first shipment of mineralized material was made to an offsite processing facility and the first gold was poured by TCM . Continual underground development and drilling through 2021 helped define T 2 mineralization over a 400 ft strike length and led to the recognition of the scale of the T 4 stockwork mineralization . Design work for a surface portal and internal decline ramp to access the Trixie underground development was commenced shortly thereafter . A geological model for T 2 - T 4 mineralization identified the potential significance of the overlying Ophir Shale, as a cap above the Tintic Quartzite host rock, in influencing the T 2 - T 4 mineralized zone . In the fall of 2021 , the Burgin Processing Facility was equipped with an onsite vat leaching process . On May 30 , 2022 , Osisko Development announced the completion of its acquisition of TCM . 59 Tintic Project April 25, 2024

Osisko Development Corp. 1. GEOLOGICAL SETTING AND MINERALIZATION 2. G EOLOGICAL S ETTING The Tintic Project is located within the historic Tintic mining district, a cluster of base and precious metal deposits covering more than 200 square kilometres ( 80 square miles) within the East Tintic Mountains of north - central Utah ( Figure 7 . 1 ) . The district is centred approximately 90 km ( 56 miles) south - southwest of Salt Lake City and 65 km ( 40 miles) south of the Bingham Canyon porphyry Cu - Au - Mo deposit . The East Tintic Mountains occupy a position within the Late Cretaceous Sevier fold and thrust belt (e . g . , Allmendinger & Jordan, 1982 ; Yonkee & Weil, 2015 ) approximately 30 km ( 20 miles) from the eastern limit of the Basin and Range extensional province, as defined by the surface expression of the Wasatch fault . District mineralization is associated with a post - Sevier compression and pre - Basin and Range extension period of magmatism, spanning ca . 27 - 35 Ma (latest Eocene to Oligocene) (e . g . , Moore et al . , 2007 ) . Commonly divided into Main, East, North and Southwest subdistricts, the greater Tintic is collectively the second largest metal producing district in Utah state, with Bingham first and Park City a close third (Krahulec and Briggs, 2006 ) . The core Tintic Project area covers more than 90 % of known deposits within the East Tintic subdistrict . Additional coverage extends north, west and south into the North, Main, and Southwest districts, respectively . 2. D ISTRICT G EOLOGY The geology of the Tintic district can be summarized as the record of four major phases of geologic evolution . These are 1 ) development of a Palaeozoic platformal sequence atop previously deformed Precambrian basement, 2 ) folding, faulting, and uplift accommodating east - west shortening during the Late Cretaceous Sevier Orogeny, 3 ) latest Eocene to Oligocene calc - alkaline magmatism associated with district mineralization, and 4 ) Miocene to recent Basin and Range extension . Precambrian basement in the Tintic district consists of phyllitic shales and coarse - grained quartzite of the Big Cottonwood Formation, exposed on the western limits of the East Tintic mountains but encountered only as xenoliths within the Eureka quadrangle at the district core . Deposited unconformably above the Big Cottonwood Formation, the Palaeozoic platformal sequence consists of a 701 to 975 m ( 2 , 300 to 3 , 000 ft) basal quartzite (the Lower Cambrian Tintic Quartzite) that grades through a relatively thin sequence of calcareous shales and lesser limestone facies (the Middle Cambrian Ophir Formation) into an extensive carbonate sequence that spans into the Late Mississippian . Total stratigraphic thickness of the Palaeozoic sequence exceeds 2 , 743 m ( 9 , 000 ft) (e . g . , Morris, 1964 : Geology of the Eureka Quadrangle ; Morris, 1964 : Geology of the Tintic Junction Quadrangle ; Morris et al . , 1979 ) ( Figure 7 . 2 ) . 60 Tintic Project April 25, 2024

Osisko Development Corp. Figure 7.1 Map of the Tintic District Displaying Mineral Occurrences and Regional Tectonic Framework Figure provided by Osisko Development. 61 Tintic Project April 25, 2024

Osisko Development Corp. Figure 7.2 Palaeozoic Stratigraphy of the Tintic District Figure provided by Osisko Development. Accommodation of east - west shortening during the Late Cretaceous Sevier Orogeny resulted in the development of the district scale Tintic syncline – East Tintic anticline fold pair, and several associated district - scale, generally west - vergent thrusts (Morris, 1964 : Geology of the Eureka Quadrangle ; Morris 62 Tintic Project April 25, 2024

Osisko Development Corp. et al . , 1979 ) . The geometry of the sub - horizontal roughly north - south trending fold pair is responsible for the general basement architecture of the Tintic district, wherein the youngest (Mississippian) rocks of the Palaeozoic sequence are preserved along the trough of the Tintic syncline in the Main district and the Tintic Quartzite is present at its highest structural levels along the crest of the East Tintic anticline in the East district ( Figure 7 . 3 ) . Steeply dipping structures developed in relation to the Sevier orogeny include a system of predominantly northeast trending faults with strike - slip offset, and a system of variably oriented normal faults developed in accommodation of late to post - orogenic gravitational collapse . (e . g . , Morris, 1964 : Geology of the Eureka Quadrangle ; Morris et al . , 1979 ) . Extensive erosion following Sevier uplift resulted in the development of a rugged paleotopography prior to the onset of district magmatism ca . 35 Ma ( Figure 7 . 4 ) . The latest Eocene to Oligocene magmatic record consists of latite and quartz latite flows and tuffs up to 1 , 500 m ( 5 , 000 ft) thick, with cross - cutting to coeval porphyritic monzonitic to locally quartz monzonitic stocks, dikes and plugs (e . g . , Morris, 1964 : Geology of the Eureka Quadrangle ; Morris, 1964 : Geology of the Tintic Junction Quadrangle ; Morris et al . , 1979 ; Keith and Kim, 1990 ) ( Figure 7 . 4 ) . District mineralization is contemporaneous and associated with magmatism in the district (Laughlin et al . , 1969 ) . In the East Tintic district, known fissure - vein and replacement deposits are nearly exclusively buried beneath the irregular volcanic cover ( Figure 7 . 5 ) . While the basal (pre - mineral) volcanic cover hosts no significant mineralization, it is commonly characterized by significant hydrothermal alteration . Several sub - km - scale lithocaps characterized by zones of strong silica, white mica, kaolinite, alunite, jarosite, dickite, and local pyrophyllite point to potential porphyry targets at depth (Morris and Lovering, 1690 ; Rockwell et al . , 2004 ; Prince, 2024 ) . Narrower zones of alteration, characterized by varying amounts of kaolinite, dickite, sericite, illite and pyrite along predominantly N to NE - trending fissures with associated pebble dikes overlie some of the known historical deposits . These alteration zones were successfully used as exploration targets in the discovery of the North Lily and Eureka Standard deposits (Morris et al . , 1979 ) . The Palaeozoic sequence and its irregular volcanic cover are disrupted by Basin and Range extensional faulting . Miocene - age volcanics likely mark the onset of extension in the district ca . 16 - 18 Ma ( Figure 7 . 4 ) . While any pre - existing fault structures are likely primed for some degree of Basin and Range extensional reactivation, the most significant normal offsets occur along roughly north - south trending structures, e . g . , the district - scale Eureka Lilly fault . The variably north - south striking and west - dipping Eureka Lilly fault forms a major aquitard through the East Tintic district, dividing a fresh, cool - water - table in its hanging - wall to the west from a hot and saline water table in its footwall to the east . Post - lava offset on the Eureka Lilly fault is apparently variable along strike and may account for only one - half to a third of the total offset across the structure, believed to have initiated during Late Sevier orogeny (Morris et al . , 1979 ) . 63 Tintic Project April 25, 2024

Osisko Development Corp. Tintic Project 64 April 25, 2024 Figure 7.3 Partial N - Facing 7.5’ Eureka Quadrangle Section A - A’ Figure provided by Osisko Development but originally digitized from Morris (1964) Geology of the Eureka Quadrangle.

Osisko Development Corp. Figure 7.4 Oligocene Volcano - Magmatic Stratigraphy of the Tintic District with Select Reported Geochronologic Data Figure provided by Osisko Development. 65 Tintic Project April 25, 2024

Osisko Development Corp. Figure 7.5 Simplified USGS Geologic Map of the East Tintic District Figure provided by Osisko Development. 66 Tintic Project April 25, 2024

Osisko Development Corp. 3. D ISTRICT M INERALIZATION AND S TRUCTURE The four subdistricts of the Tintic are in part distinguishable in terms of their known mineral occurrences, hosted within the deformed Palaeozoic sequence and, to a more limited extent, Oligocene monzonitic intrusions . The Main district is the most historically productive subdistrict by far, with characteristic carbonate - hosted lead - zinc - silver replacement deposits that form elongate, predominantly north to northeast - trending, sub - horizontal, manto - like bodies rooted into subvertical chimneys rich in copper, gold, and silver (e . g . , Krahulec and Briggs, 2006 [after Morris, 1969 ]) (Figure 7 . 1 ) . Carbonate - replacement deposits with economic zinc ц lead ц silver are likewise present in the East district and the historically least - productive North district . The East district is unique in terms of the relative structural complexity of its deposits, and by the added presence of gold and silver - rich high - sulphidation fissure vein systems, typically hosted within the brittle and unreactive Tintic Quartzite, such as at Trixie . The Southwest district is characterised by a relative dominance of igneous rocks, containing fissure systems hosted within the Silver City stock and smaller associated monzonitic porphyry intrusions (e . g . , Krahulec and Briggs, 2006 ) . The Southwest district is also host to the Southwest Tintic porphyry copper system, viewed as subeconomic but with minor historical production from peripheral high - sulphidation, copper - silver - lead veins (Krahulec and Briggs, 2006 ) . In addition to an association with both the low - and high - angle faults developed regionally through the Late Cretaceous Sevier Orogeny, mineralization within the East Tintic is often linked with a more localized network of high - angle structures, apparently developed pre to syn - mineral in association with latest Eocene to Oligocene magmatism (e . g . , Morris et al . , 1979 ) . These structures formed conduits for the emplacement of pebble dikes, monzonitic intrusions, and their associated hydrothermal fluids . They range in orientation from north - south to more prevalent north - easterly trends and are particularly well - developed as faults and fissures within the brittle Tintic Quartzite . A little more than half of the historical production within the East Tintic district has been sourced from lead - zinc - silver replacement deposits generally formed at the intersection of westerly dipping shallow thrust faults and high - angle northeast - trending structures (Krahulec and Briggs, 2006 ) (e . g . Burgin, Tintic Standard, and North Lily deposits) . High - sulphidation gold – silver ц copper deposits hosted within fissure - vein systems in the Tintic Quartzite account for the remaining historic production and all mineralized zones currently under development within the East Tintic district (Krahulec and Briggs, 2006 ) . The orientation of mineralized structures varies locally, presumably depending on pre - mineral structural priming and syn - mineral stresses . The structural trend at the Trixie is north south while fissure - vein systems elsewhere in the district tend to occupy moderate to steeply dipping northeast - southwest oriented structures . 1. Geology, Structure and Mineralization at Trixie Mineralization at the Trixie test mine is structurally controlled within a north - south - trending fissure - vein and breccia system, developed within the brittle Tintic Quartzite . Gold and silver - rich mineralization within the Trixie vein system is best classified as high - to intermediate - sulphidation epithermal (see discussion in Section 8 ) . Current development and exploration at Trixie is focused within and in the footwall to the historically productive steep - to - the - west - dipping 75 - 85 structural corridor, primarily targeting the subvertical - to - the - east - dipping T 2 fissure vein and a network of smaller - scale likewise north - south - trending mineralized fissures in its hanging wall . 67 Tintic Project April 25, 2024

Osisko Development Corp. Sub - horizontal Palaeozoic strata exposed in underground workings at Trixie are believed to occupy a position within or proximal to the hinge zone of the East Tintic anticline (Morris et al . , 1979 ), the nature of which may exert primary influence on the geometry, frequency, and distribution of grade controlling structures within the Trixie vein system . The stratigraphic contact between the Tintic Quartzite and the overlying and less permeable lower shale member of the Ophir formation appears to have an influence on the localization and grade distribution of mineralization at Trixie . While controlling structures within the Trixie vein system do penetrate the younger overlying sequences, economic mineralization is typically restricted to the brittlely fractured Tintic Quartzite . The main shaft of the historic Trixie mine was collared at approximately 1 , 852 m ( 6 , 075 ft) elevation into an outcropping window of Middle Cambrian Teutonic Limestone . The shaft passes through the full thickness of the Ophir Formation to reach the Tintic Quartzite at a depth of approximately 125 m ( 410 ft) below surface . Current development stems off the historical 625 level of the mine with lesser development off the 750 level . Deeper historical workings include the 900 , 1050 , 1200 , and 1350 levels . The water table at Trixie currently sits below the lower limits of the Trixie main shaft, which extends another ~ 100 ft below the 1350 level, around 442 m below surface . The Late Eocene to Oligocene Packard Quartz Latite unconformably overlies the Palaeozoic sequence, highlighting a rugged palaeotopography and locally reaching thicknesses up to 380 m ( 1 , 250 ft) directly south of the ventilation shaft (Figure 7 . 6 ) . North of the Trixie main shaft, the Tintic Quartzite is down - dropped an estimated 198 m ( 650 ft) across the east - west - trending sub - vertically north - dipping Trixie fault zone (Morris et al . , 1979 ) . At the very northern limits of development, the sequence is again offset relative down to the north across the Eureka Standard fault zone, which appears to consist locally of at least two major east - northeast trending splays . Though not fully constrained, relative stratigraphic offset across the Eureka Standard fault zone is of similar or greater magnitude to that observed across the Trixie Fault zone . The Eureka Lilly fault zone at Trixie runs sub - parallel to the 75 - 85 structural corridor and likewise dips steeply to the west . The two structures apparently converge just beyond the southern limits of current exploration and development . The historically mined South Survey Vein, which defines the southern limits of Trixie historic development, appears to occupy a position within or directly adjacent to Eureka Lilly structural corridor . The historic 756 ore shoot at the north end of Trixie development displays a steep northerly plunge in the footwall to the Trixie fault zone . At the southern end of Trixie development, an apparent southerly plunge to higher grade ore shoots within the historically mined 75 - 85 zone is less well understood . It has been previously suggested that the geometry of these ore shoots could be related to a presumed south - dipping splay of the Sioux Ajax fault zone, a system with known structural control on mineralization within the Mammoth and Iron Blossom mines in the Main Tintic district to the west . However, strong evidence for the presence of this structure at the southern limits of current development and exploration has yet to present . It has been more recently postulated that the apparent southerly plunge of the historically mined 75 - 85 zone ore shots may instead be controlled by the intersection of the 75 - 85 structure and the Eureka Lilly fault zone . 68 Tintic Project April 25, 2024

Osisko Development Corp. Tintic Project 69 April 25, 2024 Figure 7.6 East - Facing Geological Long Section Displaying Underground Development at Trixie Figure provided by Osisko Development.

Osisko Development Corp. 8.0 DEPOSIT TYPES There are three interrelated deposit types of particular interest within the East Tintic district : 1. Carbonate Replacement Deposits (CRDs), with lead - zinc replacement of reactive carbonate sedimentary sequences, found at the historic Burgin, Tintic Standard and North Lily mines . 2. High - Sulphidation epithermal veins : gold and silver rich epithermal vein systems hosted primarily within the basal Tintic Quartzite host rock, found at the Trixie, Eureka Standard and the deeper levels of the historic North Lily mine . 3. Porphyry Copper - Gold : copper and gold rich mineralization hosted in porphyritic intrusive rocks . Although not yet identified in East Tintic, a porphyry centre is thought to be the hydrothermal source for both the deposit styles listed above . The distribution of both CRDs and high - sulphidation epithermal vein systems in the East Tintic district is strongly lithologically controlled, with known high - sulphidation epithermal veins restricted to the Tintic Quartzite, and CRD type base - metal deposits hosted in the overlying carbonate sequence . This is reflective in part of rheological control, as the brittle nature of the quartzite makes it more prone to the development of breccia hosted epithermal veins, and in part of geochemical control, due to the more reactive nature of the carbonates to acidic fluids . The same strongly acidic hydrothermal fluid sourced from a potential deep - seated porphyry centre may be responsible for both the precipitation of high - sulphidation mineral assemblages within the quartzite and, once buffered during interaction with overlying carbonate facies rocks, the precipitation of CRD deposits . A generalized model for each of the deposit types and their idealized location relative to depth of emplacement and stratigraphic control is presented in Figure 8 . 1 . Figure 8.1 Generalized Model of Deposit Styles in the East Tintic District Source: Modified from TCM 2021. 70 Tintic Project April 25, 2024

Osisko Development Corp. 8.1 C ARBONATE R EPLACEMENT D EPOSITS CRDs account for more than 90 percent of all ore produced in the East Tintic district (Morris & Lovering, 1979 ) . Silver rich lead - zinc CRDs of the historic Burgin, Tintic Standard and North Lily mines, are characterized by the replacement of limestone by massive sulphide adjacent to intersections between steeply dipping northeast - trending faults and shallow to moderately west or southwest dipping faults . The complex geometry of the more shallowly dipping fault zones demonstrates an imbricate nature, with repeated fault bound slivers of mineralized stratigraphy, as well as localized folding of thrust sheets forming pockets or “pot - hole” structures that provided favourable focal points for mineralization . The mineralogy of the replacement deposits typically consists of massive galena ц sphalerite, with lesser silver sulphides and sulphosalts ( Figure 8 . 2 ) . In general, there is a zonation observed within the replacement bodies, with a core which is richer in lead and silver and an increase in zinc and manganese toward the peripheries (Morris & Lovering 1979 ) . Steeply dipping northeast trending fissures transect the CRD deposits and localize silver and gold - silver rich mineralization along structurally controlled planes, such as the Silver Fissure at the historic Burgin mine . Figure 8.2 CRD - Style Base - Metal Mineralization, Massive Galena Typical of the Historic Burgin, Tintic Standard and North Lily Mines Figure provided by Osisko Development. 71 Tintic Project April 25, 2024

Osisko Development Corp. 8.2 H IGH S ULPHIDATION E PITHERMAL V EIN S YSTEMS High - sulphidation epithermal vein systems containing enargite - gold - silver ores ( Figure 8 . 3 ) are structurally controlled and limited in known occurrence to the basal Tintic Quartzite unit . The brittle and relatively geochemically inert nature of the Tintic Quartzite makes it particularly well - suited to focus ascending mineralizing fluids along permeable faults and breccia zones developed within the otherwise relatively impermeable rock . This allows for the deposition of precious metal - rich gold - silver mineralization, as seen at Trixie, the historic Eureka Standard mine, and in the deeper levels of the historic North Lily mine . Hydrothermal fluids in high - sulphidation epithermal systems tend to be strongly acidic, with elevated sulphur fugacity (John et al . , 2018 ) . The conditions of the hydrothermal fluids can be deduced from the stability of the assemblage of ore and gangue minerals that precipitate from them, as well as from fluid inclusions within individual minerals . The assemblage enargite ц pyrophyllite ц alunite, which is common in the known vein systems hosted in the Tintic Quartzite, is indicative of high - sulphidation conditions (John et al . , 2018 ) . Precipitation of minerals from a hydrothermal fluid may be related to changes in temperature, pressure, pH, sulphur fugacity, or a number of other controlling factors . Rapid releases in fluid pressure are of particular importance as they can trigger flash boiling, a process which simultaneously cools the fluid while partitioning volatile phases such as H 2 S and CO 2 into the exsolved vapour leading to changes in pH and sulphur fugacity, all of which can contribute to the formation of high concentrations of gold (Hedenquist, 1985 ) . Figure 8.3 Typical Sulphide Au - Ag - Rich Vein Mineralization found at Trixie and in the Historic Eureka Standard Mine, Hand Sample taken from the Eureka Standard Dump Pile Figure provided by Osisko Development. 72 Tintic Project April 25, 2024

Osisko Development Corp. Apparent controlling structures within the East Tintic high - sulphidation epithermal vein systems are typically narrow (approximately 0 . 1 - 3 m or approximately 0 . 3 - 10 ft wide) polymetallic quartz - barite fissure veins, such as are observed at the core of the gold and silver - rich telluride - bearing T 2 structure at Trixie . High - sulphidation epithermal mineralization also occurs within silica ledges and silica - sulphide - sulphosalt flooded breccia zones adjacent to primary controlling structures, such as in the T 4 breccia zone at the Trixie mine . High - sulphidation ores are oxidized above the water table, locally characterized by the in - situ replacement of copper bearing tellurides and sulphides by bright green and blue supergene copper tellurates and copper carbonates . Oxidation and leaching of sulphides above the water table have the added benefit of releasing any refractory gold that may have otherwise been bound in the crystal structure of the sulphides . The water table at Trixie is 425 m ( 1 , 394 ft) below surface, at an elevation of 1 , 425 m ( 4 , 765 ft) and is reported at a similar elevation in the other historic mines west of the Eureka Lilly fault (Morris and Lovering, 1979 ) . East of the Eureka Lilly fault the water table is hot and saline and is approximately 50 m lower in elevation than on the west side . 1. Mineralized Structures at Trixie Mineralization at Trixie is structurally controlled within a series of interrelated discrete networking and/or cross - cutting permeable and locally dilational faults (i . e . , “fissure veins”) and their associated damage zones . These include : 75 - 85 , T 2 , T 3 (a and b), 40 Fault, Wildcat, and several other unnamed discrete structures which define the broader T 4 Domain ( Figure 8 . 4 ) . Though controlling structures may penetrate younger stratigraphic horizons, mineralization is limited to the Tintic Quartzite, as overlying shales belonging to the lower member of the Ophir Formation formed an impermeable cap to mineralizing fluids . 1. 75 - 85 Structure The 75 - 85 structure consists of a discrete north - south striking moderate west - dipping polymetallic silica - sulphide cemented breccia zone . The structural zone connects to two historically developed tabular mineralized bodies, the 756 at the north end of Trixie development, and the 75 - 85 mineralized shoot to the south (Morris et al . , 1979 ) . Historically documented primary economic minerals include a wide range of silver, copper, lead and/or zinc bearing sulphides and sulphosalts (e . g . , argentite, proustite, polybasite, silver - bearing tennantite - tetrahedrite, enargite, chalcopyrite, bornite, galena, sphalerite and pyrite), as well as native gold (Morris et al . , 1979 ) . Gangue minerals are chiefly crystalline quartz and barite . Combined modern modelling and historic documentation define the structure along a strike length of approximately 700 m ( 2 , 300 ft) from its northern termination in a series of horsetail fractures about 30 m ( 100 ft) south of the Trixie fault (Morris et al . , 1979 ) to an unconstrained southerly termination at either the Eureka Lilly fault, or the postulated westerly projection of the Sioux Ajax fault (see Section 7 ) . Historic development on the 756 ore shoot extends approximately 23 m ( 75 ft) below the 1350 - foot development level (approximately 1 , 416 m ; 4 , 645 ft elevation) . The mineral potential for this zone remains open at depth . 73 Tintic Project April 25, 2024

Osisko Development Corp. Figure 8.4 North Facing Geological Cross - Section displaying Mineralized Domains and Controlling Structures at Trixie Figure provided by Osisko Development but modified from TCM June, 2022. 74 Tintic Project April 25, 2024

Osisko Development Corp. The most recent model iterations give an approximate average strike of 347 Σ ( 167 Σ ) and dip of 63 Σ to the west for the 75 - 85 structure . The 63 Σ average dip is slightly less than the historically documented average of 75 Σ , and ranges from approximately 65 Σ to as shallow as 45 Σ locally . The strike of the structure is historically documented to range locally from 005 Σ through 340 Σ (Morris et al . , 1979 ) . Similar deflections are recognized presently, the most dramatic of which being a counterclockwise deflection to a 330 Σ strike at the southern limits of the current model constraints . Current data suggest that the 75 - 85 structure truncates the T 2 and similar discrete structures of the T 4 zone . The Tintic Quartzite – Ophir Shale contact is down - dropped in the hanging wall of the 75 - 85 structure, with an apparent normal offset of approximately 15 m ( 45 - 50 ft) where best constrained . 2. T2 Structure The structurally controlled T 2 domain is a discrete subvertical to the east - dipping fissure vein and breccia zone generally characterized by polymetallic gold and silver - rich telluride - bearing mineralization with quartz - barite gangue . While some evidence for historical mining of the structure around the 675 - foot sublevel is indicated by the presence of minor stoping dating from the 1970 s, the continuity and full potential of the structure was not recognized until its ‘discovery’ by TCM in 2020 . 3. T3 Structures T 3 structures include two discrete fissure vein and breccia zones identified within the 75 - 85 hanging wall . The first documented (T 3 a) consists of an approximately 1 m ( 2 - 3 ft) - wide north - south striking and steep to the east - dipping fissure vein characterized by base and precious metal mineralization with quartz - barite gangue in breccia fill and lenses . As currently constrained, the structure is of limited measurable length along strike and down - dip, 165 m ( 550 ft) and 40 m ( 140 ft), respectively . A newly delineated strike parallel structure (T 3 b) with an opposing westward dip is of similar scale, style of mineralization, and constrained extents . Both T 3 a and b are open for potential along strike, their down - dip interaction is untested and unconstrained . 4. T4 Domain The T 4 domain is a broad zone extending east of the 75 - 85 structure into its footwall, enveloping T 2 and comprising a series of generally smaller - scale linking and cross - cutting T 2 - style discrete structures and their associated damage zone quartz - barite stockwork . The T 4 domain has been expanded to include the T 1 domain of the T 2 footwall, as the two domains are now understood to be indistinct from one another . A total of thirteen constrained discrete structures, including the Wildcat, are T 2 subparallel . They strike variably N - S with dips ranging from ~ 60 Σ to the east through vertical to ~ 80 Σ to the west . Constrained structures range from 0 . 1 to 0 . 8 m (< 0 . 5 to 2 . 5 ft) wide at their core and are continuous along strike lengths of 45 m ( 150 ft) or greater . Damage zone stockwork is often accompanied by tellurides and dark sulphosalt inclusions comprising less than 0 . 5 % of vein mass but typically related to elevated gold grades . Definable discrete structures are densely spaced, with an average separation of around 3 - 4 . 5 m ( 10 - 15 ft) where they have been tested with development and high density drilling surrounding T 2 . Mineralization within the broader T 4 domain is now understood to be controlled by these discrete structures, whether or not sufficient data exists for their individual constraint . 75 Tintic Project April 25, 2024

Osisko Development Corp. 8.2.1.5 40 Fault Structure The newly recognized 40 Fault is named as such because of its unique low - angle ( 40 Σ ) easterly dip . The 1 m - wide structure is traceable through several modern 625 sublevels and cross - cuts, consisting predominantly of re - brecciated gold and silver - bearing mineralized quartzite and quartz - barite vein gangue . Post mineral reactivation on the structure is observed to truncate and offset the mineralized discrete structures of T 4 , though the degree of offset is unconstrained . The nature of the interaction between the 40 Fault and 75 - 85 structure is likewise unconstrained . However, if the 40 Fault does cross - cut the well constrained 75 - 85 structure, any offset would be quite minimal, less than 1 . 5 m ( 5 ft) . 8.2.2 Trixie Gold - Tellurium Mineralization The gold and silver - rich T 2 and T 4 domain discrete structures at Trixie are constrained within the footwall of the historically mined west - dipping 75 - 85 structure . The T 2 structure consists of a 0 . 2 to 0 . 8 m (~ 0 . 5 to 2 . 5 ft) central fissure vein and fault core (Figure 8 . 5 ), the latter characterized by a visually striking green - blue mosaic framework breccia consisting of angular Tintic Quartzite clasts within a highly mineralized fracture fill cement matrix (Figure 8 . 6 ) . The breccia matrix and central vein consist of mosaic to drusy quartz intergrown with coarse - crystalline bladed barite, sulphosalts, native gold, and gold - silver bearing tellurides that have been variably oxidized to form copper - tellurates (Figure 8 . 7 ) . Gold values in the thousands of ppm within T 2 are associated with significant visible free gold and Ag ц Au - tellurides . Figure 8.5 Schematic Section of Mineralization and Alteration Associated with the T2 Structure Figure provided by Osisko Development. 76 Tintic Project April 25, 2024

Osisko Development Corp. Discrete structures within the T 4 domain are characteristically similar though average gold grades are significantly lower, with the highest reported values around 100 - 200 ppm Au . Preservation of open space along the core of the central fissure is frequently observed in all structures . All mineralization is capped by the contact with the lower shale member of the Ophir Formation, approximately 25 to 40 m ( 80 to 130 ft) above the 625 level of mining . The relatively impermeable shale is thought to play a critical role in confining the gold mineralization to structures within the Tintic Quartzite . The anomalous gold grades and exotic telluride and copper - tellurate mineralogy associated with the T 2 structure are markedly different to the historically mined polymetallic mineralization found in the 75 - 85 and associated structures . However, polymetallic mineralization within the T 2 structure is provided by the presence of spotty base - metal and sulphide - rich mineralization within historic drill hole intercepts both at depth and along strike to the north . Recent development at the Trixie 750 level has also revealed the T 2 to be locally sulphide - sulphosalt - rich and telluride - poor, containing massive intergrown pyrite, enargite, and tennantite - tetrahedrite . Figure 8.6 Left: Hand Sample from the T2 Structure; Right: Hand Sample from the T4 Stockwork Zone Figure provided by Osisko Development. 8.2.3 Trixie T2 Structure: A Genetic Model for Mineralization Each of the high - angle structures defined at Trixie are believed to have formed initially as part of a larger extensional fault system pre - dating mineralization . While localized polymetallic mineralization within the T 2 structure indicates a genetic linkage to the 75 - 85 mineralizing event, the 75 - 85 structure itself must have remained effectively sealed to the gold - telluride mineralization event effecting T 2 and like structures of the T 4 domain . T 2 characteristic mineralization, with its lack of sulphides, significant native free gold, electrum, and Au - Ag - tellurides, is consistent with rapid mineral precipitation from boiling . Flash boiling can cause the rapid deposition of free gold (Hedenquist and Henley, 1985 ) and is further evidenced by abundant gas - rich fluid inclusions found in thin sections from areas surrounding gold - bearing mineralization within T 2 (Figure 8 . 7 ) . It has been suggested that flash boiling was initiated by rapid depressurization through rock failure and brecciation at some point when hydrostatic fluid pressure exceeded confining lithostatic pressure in the system . However, some degree of brecciation was surely associated with the 77 Tintic Project April 25, 2024

Osisko Development Corp. pre - mineralization incipient development of T2, and a variety of other factors may have contributed to reaching boiling conditions. Figure 8.7 Thin Sections from the T2 Structure Figure provided by Osisko Development modified from APSAR 2020. Recent exploration has suggested that the contrasting sulphide - rich nature of the T 2 observed on the 750 ft level may represent a depth - dependent transition in mineralization style . The apparent zonation may be reflective of a lower elevation limit to boiling levels, or to rheologic control exhorted by shale dominant facies within the Tintic Quartzite sequence . It was previously postulated that the south - dipping Sioux Ajax fault zone, projected to intersect at the southern limits of modern Trixie development, provided deep - seated plumbing that facilitated upward migration of late stage overprinting Au - telluride hydrothermal fluids . Drill testing in this area in 2023 did not yield strong evidence for the presence of the Sioux Ajax fault in its modelled location and it is now understood that the T 2 structure at the southern end of modern development is in fact truncated at its highest structural levels by a counter - clockwise deflection in the cross - cutting 75 - 85 structure . The potential for T 2 gold and silver - rich telluride - bearing mineralization at high structural levels remains open along strike to the North . 78 Tintic Project April 25, 2024

Osisko Development Corp. 8.3 P ORPHYRY C OPPER - G OLD P OTENTIAL The Tintic district has long been recognized for its porphyry mineralization potential, located 65 km south of the Bingham Canyon mine and in a mineral district displaying many similar characteristics . The Bingham Canyon porphyry copper - gold - molybdenum deposit is associated with a halo of carbonate replacement zinc - lead - silver deposits, like those of the Tintic district . Known low - grade porphyries are located immediately to the south of TCM’s land holding at the Southwest Tintic Porphyry deposit and the Treasure Hill area . Several potential porphyry centres are interpreted beneath the East Tintic district itself, likely responsible for driving the hydrothermal fluid flows that are reflected in the carbonate replacement and high - sulphidation deposits throughout the district . As shown in Figure 8 . 8 , several alteration lithological caps have been identified on surface, indicative of the upward (or lateral) flow of hot acidic hydrothermal fluid from depth and these have been the focus of limited exploration drilling by Anglo American and Rio Tinto between 2008 and 2014 . Of particular interest is the area surrounding Big Hill, where a coincident gold and molybdenum in soil anomaly coincides with an area where B - type quartz veinlets have been mapped on surface . The potential for the discovery of a large copper porphyry centre or centres beneath the East Tintic district will depend on well designed greenfields exploration and drilling programs . 79 Tintic Project April 25, 2024

Osisko Development Corp. Figure 8.8 Mapped Lithological Caps Relative to Known Deposits Figure provided by Osisko Development modified from Morris, 1964. 80 Tintic Project April 25, 2024

Osisko Development Corp. 1. EXPLORATION 2. G ENERAL I NFORMATION Exploration work undertaken at the Tintic Project in 2022 and 2023 consisted of a coordinated underground mapping and sampling program at Trixie, a regional surface mapping and sampling campaign as well as compilation of historical data from several of the largest mining operations in the district . Underground at Trixie, post - advancement face, rib and back chip - sampling, and post - survey three - dimensional underground back and rib geologic mapping were conducted by the geological team . On surface, detailed geological and alteration mapping, structural measurements, and rock sampling were conducted by Osisko Development geologists while soil samples were collected by a team from Rangefront Mining Services (Rangefront Mining) . 2. U NDERGROUND E XPLORATION 1. Underground Mapping Geologists conduct underground mapping for all new development headings . Mapping consists of analog data collection on letter page size base maps prepared in the Maptek 3 D modelling program Vulcan . Once a newly developed area has been line - surveyed and updated in Vulcan, the geologist can begin map preparation . The geologist will load two survey files, one containing the rib outline, the other the back and sill lines . The rib survey is extruded outward by the average difference between the sill and back elevations to match the height of the heading . Following these steps, the geologist can generate base maps containing spatially accurate 2 D areas for the ribs, face, and back, which are then printed off at a 1 : 20 scale ( Figure 9 . 1 ) . Prior to data collection underground, the geologist will wash down the area to be mapped to obtain a clearer exposure of the geological units . Map data collected include lithology, structure, alteration and mineralization . Direct measurements of structures including bedding, fractures and veins, are collected using a Brunton® Standard Transit compass and directly plotted onto maps . Completed maps are transferred to mylar compilation level maps . When the levels are complete, they are scanned and saved onto the network . Geologists register the maps in the Maptek 3 D modelling program Vulcan and digitize the back mapping . Finally, the mapping data and structural data are used in conjunction with sample data to aid 3 D computer modelling . 2. Underground Chip Sampling Trixie underground chip samples are classified as one of three types : face, rib, or back . Face chip samples are collected along structure - parallel cuts at all development faces, following each round of advancement ( Figure 9 . 2 ) . Rib chip samples are collected parallel to development along headings designed to cross perpendicular to structures of interest, e . g . , exploration drifts . Back chip samples are collected to decrease data spacing in areas of overbreak or, in instances where face sampling was not completed prior to further advancement, they may run either perpendicular or parallel to development . Face chip widths are limited by the width of development, averaging approximately 1 . 75 m ( 5 . 75 ft) in 2022 . Rib chips, by nature of being parallel to development, are typically much longer, ranging from a 81 Tintic Project April 25, 2024

Osisko Development Corp. minimum of 1 . 2 m ( 4 ft) to greater than 24 m ( 80 ft) during 2022 . While face chips are the most commonly collected chip type, accounting for more than 75 % of individual chips reported herein, they account for only 51 % of the total length of development sampled in 2022 . Back chips account for less than 5 % of the total length of sampling in 2022 . Figure 9.1 Example of an Underground Map Sheet Figure provided by Osisko Development. 82 Tintic Project April 25, 2024

Osisko Development Corp. Figure 9.2 Schematic illustrating the Three Classifications of Chip Sample Sequences Underground at Trixie Figure provided by Osisko Development . 9.2.3 Chip Sample Collection Procedures Prior to chip sampling, a geologist will inspect the development face to be sampled and fill out a digital data form referred to as a face sheet ( Figure 9 . 3 ) . Basic data captured on each face sheet include a parent face identification (ID), indicating the development name, chip/site ID, the distance and bearing from the nearest survey point, the face azimuth and sampling width, the name of the sampling geologist and the date . Chip/site IDs are a five - digit number assigned in sequence, e . g . , 00738 and 01708 for the first and last chips reported herein . A prefix of CH is added in the database to distinguish from underground diamond and surface RC drill holes, e . g . , CH 01208 . Distance from the nearest surveyed reference point is measured to the face along either the left or right rib, depending on the survey point location . Face azimuth is calculated by adding 90 Σ to a bearing shot perpendicular to the face, using a Brunton® compass . All distance measurements are recorded in feet . While advancing along mineralized structures, each face chip consists ideally of a minimum of three samples to ensure separate coverage of the footwall, hanging wall and the target structure, i . e . , vein . The first sample in sequence will typically begin at the left - rib - face intersection and extend to the margin of the vein . The second sample will typically cover the full width of the vein, and the third sample will extend from the right vein margin to the right - rib - face intersection . The geologist may collect fewer than three samples if the overall width of the face or location of the vein within it does not allow for separate footwall, hanging wall, and vein samples greater than or equal to a minimum sampling width of 0 . 5 ft . For rib chips and any face chips that cut multiple veins or otherwise complex geology, the geologist will collect as many samples as are necessary for adequate representation and coverage from the minimum 0 . 5 to a maximum sample width of 5 ft . 83 Tintic Project April 25, 2024

Osisko Development Corp. Figure 9.3 Example of a Chip Sampling Sketch and Data Sheet, CH1317 Figure provided by Osisko Development . For every chip, a full colour schematic sketch is made at a 1 : 60 ( 1 in . = 5 ft . ) scale within a pre - labeled grid contained within the face sheet ; 3 x 3 in . for face sketches and 2 x 3 in . for back sketches . Sketches are carried across multiple face sheet forms for chip sample sequences longer than 15 ft . Typical quartzite host rock is sketched in yellow, shale in brown and veins in red . Zones of stockwork are denoted by a red X pattern and zones of brecciation by a triangle pattern . For all chips crossing veining, the sampling geologist will take a minimum of one direct vein measurement using the Brunton® compass, label the measurement at its point of collection on the sketch, and record its orientation in strike and dip ( 000 Σ / 00 Σ ), using the North American right - hand rule convention . Multiple structural measurements will be taken and recorded in instances of multiple veins and/or notable differences between hanging wall and footwall orientation . Samples are recorded and collected from left to right, with intervals indicated on the face sketch and the corresponding sample IDs recorded in a table at the bottom of the face sheet . Sample IDs are derived from the chip/site ID . A prefix of F, B, or R is assigned to distinguish face, back and rib chips, respectively . A two - digit numerical suffix counting in sequence from 01 , is then added to distinguish 84 Tintic Project April 25, 2024

Osisko Development Corp. individual chip samples within a sequence, e . g . , the resulting ID F 131701 indicates the first sample in sequence along face chip site 1317 . The sample table at the bottom of the face sheet includes additional observational fields to be filled out row - by - row for each individual sample, including width, lithology and lithologic unit (i . e . , USGS map unit code), as well as abundances of visible gold, identifiable tellurium - bearing minerals, tetrahedrite, barite, copper oxides, and sulphides . Individual samples are collected into 10 ” by 17 ” CGS protexo cloth bags labelled with the sample ID as recorded on the corresponding face sheet . Beginning with the leftmost sample 01 , each labelled bag is placed in a container and held at a height of approximately 1 . 5 m ( 5 ft) from the sill floor while material is chipped into it, moving across the face from left to right . At the end of one sample interval, the geologist will tie the bag, remove it from the container and continue with the next sample . Once all samples are collected, the geologist will mark the vein/sample margins on the face with spray paint and take a photograph ( Figure 9 . 4 ) . All samples are brought to the Burgin mine laboratory for assaying at the end of a shift . Back at the office, the geologist will hand - enter the day’s data into the Datamine software DH Logger, where the sample IDs can be connected with assay values once the assays certificates are complete . The geologist will then scan all face sheets for registration/georeferencing in Vulcan . Figure 9.4 Post - Sampling Face Photo of Site CH1317 Figure provided by Osisko Development. 85 Tintic Project April 25, 2024

Osisko Development Corp. 4. Chip Sample Location Procedures Chip sample sequences are effectively captured in the database as drill holes, moving “downhole” left to right, from a zero - depth collar referenced from the start of sampling back to the nearest surveyed reference point . As all face chips are collected horizontally, each is assigned dip of 0 , input with the calculated face azimuth representing trend into a single data row within the DH Logger downhole survey table . Rib chips may be assigned a positive or negative dip value to appropriately represent sampling along ramps and declines . Point survey updates are conducted by an in - house surveyor two to three times per week . Following an update, geologists will load the surveys in Vulcan and measure the recorded distance from the nearest surveyed reference point along the trend of the heading, to acquire XYZ collar coordinates for all recent chips . These coordinates are recorded on the chip’s face sheet and entered into DH Logger . Chips are loaded in Vulcan weekly to ensure that the strings are located properly . Face chips strings should run perpendicular to the development heading and be centred on the rib survey, to account for equal overbreak on either rib during advancement . Rib chips should parallel either the left or right rib survey, referenceable within the parent Face ID . 5. Trixie Underground 2022 - 2023 Chip Samples and Assays All samples were assayed for gold and silver at the on - site Tintic laboratory . Assays are presented herein within a series of maps and sections by development area (Figure 9 . 5 to Figure 9 . 9 ), and as composites with selected individual sample highlights within Table 9 . 1 , which uses metric lengths and grades . 86 Tintic Project April 25, 2024

Tintic Project 87 April 25, 2024 Figure 9.5 Trixie Long - Section Displaying New Development and Chip Sequence Sample Assay Map/Section Location Traces Figure provided by Osisko Development. Osisko Development Corp.

Osisko Development Corp. Figure 9.6 Trixie Chip Sequence Assay Map, 665 Sublevel (Eileen Drift) and Ramp Development Figure provided by Osisko Development. Tintic Project 88 April 25, 2024

Osisko Development Corp. Figure 9.7 Trixie Chip Sequence Assay Map, Sill 4 Development Cut Figure provided by Osisko Development. Tintic Project 89 April 25, 2024

Osisko Development Corp. Figure 9.8 Trixie Chip Sequence Assay Map, Sill 5 Development and Exploration Cuts Figure provided by Osisko Development. Tintic Project 90 April 25, 2024

Osisko Development Corp. Figure 9.9 Trixie Chip Sequence Assay Map, Raise 1 Pillar Cut 1 Figure provided by Osisko Development. Tintic Project 91 April 25, 2024

Osisko Development Corp. Table 9.1 Select 2022 and 2023 Trixie Underground Chip Sequence Sample Assay Composites Tintic Project 92 April 25, 2024 Development Area Ag (g/t) Au (g/t) Length (m) Depth to (m) Depth from (m) Site ID n1 Sill 2 Development 310.93 1089.83 1.46 1.46 0 CH00738 Sill 2 Development 746.22 2609.65 0.61 1.07 0.46 including CH00738 Sill 3 Development 377.87 208.2 2.74 2.74 0 CH00742 Sill 3 Development 1573.11 890.97 0.52 2.74 2.23 including CH00742 Sill 2 Development 179.6 475.69 0.7 1.16 0.46 including CH00744 Sill 2 Development 84.05 171.39 2.01 2.01 0 CH00744 Sill 2 Development 720.25 901.03 0.76 1.46 0.7 including CH00746 Sill 2 Development 294.87 352.56 2.01 2.01 0 CH00746 Sill 2 Development 737.97 1047.03 0.37 0.37 0 including CH00747 Sill 2 Development 1024.73 568.84 0.34 0.7 0.37 and CH00747 Sill 2 Development 97.67 35.14 0.3 1.01 0.7 and CH00747 Sill 2 Development 64.02 110.78 0.37 2.04 1.68 and CH00747 Sill 2 Development 333.35 309.48 2.04 2.04 0 CH00747 625 Level Sill 35.96 18.82 2.44 2.44 0 CH00781 625 Level Sill 269.39 147.65 0.3 1.22 0.91 including CH00781 Sill 3 Development 3596.74 1143.35 0.61 0.85 0.24 and CH00787 Sill 3 Development 1694.76 525.02 1.46 1.46 0 CH00787 Sill 3 Development 1102.3 288.38 0.24 0.24 0 including CH00787 Raise 4 Bench 799.42 634.42 0.61 1.83 1.22 including CH00792 Raise 4 Bench 555.85 593.69 0.61 2.44 1.83 and CH00792 Raise 4 Bench 101.06 151.73 0.61 3.66 3.05 and CH00792 Raise 4 Bench 22.49 120.84 0.61 4.27 3.66 and CH00792 Raise 4 Bench 378.23 798.05 0.61 4.88 4.27 and CH00792 Raise 4 Bench 262.91 306.97 4.88 4.88 0 CH00792 Raise 4 Exploration 353.74 224.19 0.61 3.05 2.44 including CH00832 Raise 4 Exploration 114.18 44.67 4.27 4.27 0 CH00832 Sill 4 Development 1011.18 535.28 0.18 0.18 0 including CH00878 Sill 4 Development 2471.51 567.26 0.3 0.49 0.18 and CH00878 Sill 4 Development 0.01 591.5 0.43 0.91 0.49 and CH00878 Sill 4 Development 771.44 432.04 1.22 1.22 0 CH00878 Sill 4 Development 62.7 90.81 0.61 0.61 0 including CH00889 Sill 4 Development 525.95 464.83 0.61 1.83 1.22 and CH00889 Sill 4 Development 702.4 327.84 0.61 2.44 1.83 and CH00889 Sill 4 Development 238.3 158.23 3.66 3.66 0 CH00889 Sill 4 Development 2454.88 3722.31 0.34 1.4 1.07 including CH00893 Sill 4 Development 540.37 694.5 1.95 1.95 0 CH00893 Sill 3 Development 4394.48 5390.78 0.7 1.01 0.3 including CH00896 Sill 3 Development 2269.69 2771.97 1.37 1.37 0 CH00896 Sill 3 Development 2047.51 1430.44 0.46 1.37 0.91 including CH00898 Sill 3 Development 171.13 101.17 0.3 1.68 1.37 and CH00898

Osisko Development Corp. Development Area Ag (g/t) Au (g/t) Length (m) Depth to (m) Depth from (m) Site ID n1 Sill 3 Development 589.75 410.31 1.68 1.68 0 CH00898 625 Level Sill 208.16 22.42 0.43 0.43 0 CH00900 Sill 3 Development 457.69 1749.76 0.3 0.91 0.61 and CH00910 Sill 3 Development 227.71 430.14 0.61 0.61 0 including CH00910 Sill 3 Development 153.12 211.86 0.61 1.52 0.91 and CH00910 Sill 3 Development 243.87 606.75 1.52 1.52 0 CH00910 Sill 3 Development 425.99 4150.15 0.3 0.61 0.3 including CH00911 Sill 3 Development 205.14 225.55 0.61 1.22 0.61 and CH00911 Sill 3 Development 214.18 1152.4 1.22 1.22 0 CH00911 Sill 3 Development 1153.72 14883.2 0.3 0.85 0.55 including CH00913 Sill 3 Development 215.12 2724.03 1.68 1.68 0 CH00913 Sill 3 Development 132.26 907.44 0.61 0.61 0 including CH00914 Sill 3 Development 81.52 846.79 0.3 0.91 0.61 and CH00914 Sill 3 Development 40.62 94.96 0.61 1.52 0.91 and CH00914 Sill 3 Development 85.46 570.32 1.52 1.52 0 CH00914 Sill 5 Development 171.48 404.02 1.01 1.01 0 CH00946 Sill 5 Development 773.47 2053.6 0.18 0.79 0.61 including CH00946 Sill 4 Development 479.47 1367.96 0.46 0.46 0 CH00966 Sill 4 Development 126.38 1523.54 1.22 1.22 0 CH00973 Sill 4 Development 233.04 262.1 0.3 0.3 0 including CH00973 Sill 4 Development 191.28 5753.47 0.3 0.61 0.3 and CH00973 Sill 4 Development 294.68 372.56 1.98 1.98 0 CH00974 Sill 4 Development 423.66 496.58 0.49 0.49 0 including CH00974 Sill 4 Development 475.98 624.26 0.79 1.28 0.49 and CH00974 Sill 4 Development 319.59 657.83 1.65 1.65 0 CH00975 Sill 4 Development 22.14 92.49 0.61 0.61 0 including CH00975 Sill 4 Development 1183.93 2389.35 0.43 1.04 0.61 and CH00975 Sill 4 Development 747.1 386.04 1.37 1.37 0 CH01006 Sill 4 Development 1665.65 848.82 0.61 1.37 0.76 including CH01006 665 Sublevel (Eileen) 1005.97 543.03 2.56 2.56 0 CH01007 665 Sublevel (Eileen) 2546.06 1381.6 1.01 2.56 1.55 including CH01007 665 Sublevel (Eileen) 141.38 367.54 3.54 3.54 0 CH01011 665 Sublevel (Eileen) 911.1 2352.18 0.55 2.32 1.77 including CH01011 665 Sublevel (Eileen) 1086.13 1277.05 0.24 1.16 0.91 including CH01060 665 Sublevel (Eileen) 122.94 143.28 2.19 2.19 0 CH01060 665 Sublevel (Eileen) 140.79 193.24 2.74 2.74 0 CH01066 665 Sublevel (Eileen) 389.75 1075.52 0.3 0.3 0 including CH01066 665 Sublevel (Eileen) 98.22 146.18 0.61 1.83 1.22 and CH01066 665 Sublevel (Eileen) 226.98 123.17 0.91 1.22 0.3 and CH01066 665 Sublevel (Eileen) 83.4 226 2.5 2.5 0 CH01069 665 Sublevel (Eileen) 323.83 903.57 0.61 1.98 1.37 including CH01069 665 Sublevel (Eileen) 17.9 221.27 2.1 2.1 0 CH01072 665 Sublevel (Eileen) 56.12 693.59 0.67 2.1 1.43 including CH01072 Tintic Project 93 April 25, 2024

Osisko Development Corp. Development Area Ag (g/t) Au (g/t) Length (m) Depth to (m) Depth from (m) Site ID n1 Raise 5 Exploration 106.92 20.87 11.98 11.98 0 CH01087 Raise 5 Exploration 436.58 164.62 0.61 4.88 4.27 including CH01087 Raise 5 Exploration 74.01 16.63 11.06 11.06 0 CH01088 Sill 5 Development 608.09 856.54 0.94 0.94 0 CH01102 Sill 5 Development 1559.99 2202.85 0.37 0.76 0.4 including CH01102 Sill 5 Development 42.51 683.53 1.04 1.04 0 CH01105 Sill 5 Development 102.4 1769.33 0.4 0.64 0.24 including CH01105 Sill 5 Development 315.99 2800.11 2.07 2.07 0 CH01110 Sill 5 Development 528.9 4757.42 1.22 1.22 0 including CH01110 Sill 5 Development 1224.91 1553.07 1.52 1.52 0 CH01114 Sill 5 Development 2263.41 2873.05 0.82 0.82 0 including CH01114 Sill 5 Development 226.01 229.62 1.34 1.34 0 CH01115 Sill 5 Development 686.29 712.31 0.43 0.82 0.4 including CH01115 Sill 5 Development 219.6 358.06 1.25 1.25 0 CH01116 Sill 5 Development 810.38 1324.67 0.34 0.34 0 including CH01116 Raise 6 Exploration 16.81 7.76 16.46 18.29 1.83 CH01138 Sill 5 Development 6698.97 5197.77 0.61 0.61 0 CH01163 665 Sublevel (Eileen) 30.04 145.85 2.29 2.29 0 CH01176 665 Sublevel (Eileen) 51.72 681.89 0.49 0.85 0.37 including CH01176 665 Sublevel (Eileen) 5.17 912.28 2.53 2.53 0 CH01180 665 Sublevel (Eileen) 0.01 4186.46 0.55 1.49 0.94 including CH01180 665 Sublevel (Eileen) 69.94 340.36 2.19 2.19 0 CH01187 665 Sublevel (Eileen) 209.81 1017.01 0.73 1.04 0.3 including CH01187 Sill 5 Exploration 155.96 226.53 1.83 1.83 0 CH01206 Sill 5 Exploration 0.01 672.03 0.55 1.46 0.91 including CH01206 Sill 5 Exploration 444.6 91.09 0.37 1.83 1.46 and CH01206 Raise 1 Pillar Cut 1 2586.22 503.78 3.35 3.35 0 CH01228 Raise 1 Pillar Cut 1 6994.86 1375.03 1.22 2.74 1.52 including CH01228 Raise 1 Pillar Cut 1 186.92 234.46 1.68 1.68 0 CH01237 Raise 1 Pillar Cut 1 1003.57 1272.44 0.3 0.91 0.61 including CH01237 Raise 1 Pillar Cut 1 742.56 368.37 1.49 1.49 0 CH01238 Raise 1 Pillar Cut 1 1212 598.32 0.91 1.19 0.27 including CH01238 Raise 1 Pillar Cut 1 1113.03 468.8 1.37 1.37 0 CH01247 Raise 1 Pillar Cut 1 1582.72 656.15 0.91 1.37 0.46 including CH01247 Sill 6 Development 79.14 1091.44 0.76 0.76 0 CH01252 Sill 6 Development 158.95 2455.35 0.34 0.34 0 including CH01252 Sill 6 Development 95.44 1237.85 0.98 0.98 0 CH01254 Sill 6 Development 185.16 2637.71 0.46 0.46 0 including CH01254 Sill 6 Development 131.19 1700.62 0.76 0.76 0 CH01255 Sill 6 Development 265.43 3539.06 0.37 0.37 0 including CH01255 Sill 6 Development 78.71 3901.32 0.91 0.91 0 CH01256 Sill 6 Development 124.89 7765.62 0.46 0.46 0 including CH01256 Sill 6 Development 47.4 642.74 1.34 1.34 0 CH01257 Tintic Project 94 April 25, 2024

Osisko Development Corp. Development Area Ag (g/t) Au (g/t) Length (m) Depth to (m) Depth from (m) Site ID n1 Sill 6 Development 106.48 1549.64 0.43 1.34 0.91 including CH01257 Sill 6 Development 113.7 637.91 0.91 0.91 0 CH01258 Sill 6 Development 231.04 1833.74 0.3 0.3 0 including CH01258 Sill 6 Development 22.54 186.4 1.77 1.77 0 CH01260 Sill 6 Development 116.01 1477.34 0.21 1.77 1.55 including CH01260 665 (Eileen) Ramp 31.49 90.07 2.74 2.74 0 CH01264 665 (Eileen) Ramp 128.42 399.25 0.61 1.95 1.34 including CH01264 665 (Eileen) Ramp 56.23 295.26 3.05 3.05 0 CH01267 665 (Eileen) Ramp 280.94 1468.7 0.61 2.74 2.13 including CH01267 Sill 6 Development 655.67 642.3 1.22 1.22 0 CH01271 Sill 6 Development 2473.95 2464.66 0.3 0.61 0.3 including CH01271 Raise 1 Pillar Cut 2 488.6 287.29 1.16 1.16 0 CH01287 Raise 1 Pillar Cut 2 608.5 974.15 0.3 0.52 0.21 including CH01287 Raise 1 Pillar Cut 2 2278.57 167.84 0.15 0.98 0.82 and CH01287 Raise 1 Pillar Cut 2 137.02 51.29 0.18 1.16 0.98 and CH01287 Raise 1 Pillar Cut 2 410.98 171.16 1.31 1.31 0 CH01291 Raise 1 Pillar Cut 2 1557.18 661.95 0.34 0.79 0.46 including CH01291 Sill 7 Development 61.32 220.33 1.07 1.07 0 CH01298 Sill 7 Development 244.77 1227.49 0.15 0.76 0.61 including CH01298 Raise 1 Pillar Cut 1 1399.2 310.45 2.44 2.44 0 CH01317 Raise 1 Pillar Cut 1 6294.04 1058.14 0.43 0.91 0.49 ncluding CH01317 Raise 1 Pillar Cut 1 957.56 489.61 0.49 2.01 1.52 and CH01317 Raise 1 Pillar Cut 1 778.59 502.85 2.01 2.01 0 CH01318 Raise 1 Pillar Cut 1 1799.52 683.61 0.64 0.88 0.24 including CH01318 Raise 1 Pillar Cut 1 632.05 883.89 0.64 1.52 0.88 and CH01318 Raise 1 Pillar Cut 1 1299.79 453.34 1.74 1.74 0 CH01320 Raise 1 Pillar Cut 1 2428.18 844.67 0.94 1.25 0.3 including CH01320 Raise 1 Pillar Cut 1 273.11 270.9 2.07 2.07 0 CH01321 Raise 1 Pillar Cut 1 164.24 188.14 0.98 1.58 0.61 including CH01321 Raise 1 Pillar Cut 1 611.48 721.53 0.49 2.07 1.58 and CH01321 Raise 1 Pillar Cut 1 641.26 405.91 1.98 1.98 0 CH01322 Raise 1 Pillar Cut 1 2034.66 1297.91 0.61 1.98 1.37 including CH01322 Raise 1 Pillar Cut 1 215.94 331.03 2.62 2.62 0 CH01323 Raise 1 Pillar Cut 1 217 1101.03 0.37 0.73 0.37 including CH01323 Raise 1 Pillar Cut 1 408.78 376.38 0.98 2.62 1.65 and CH01323 Raise 1 Pillar Cut 1 446.22 352.65 4.57 4.57 0 CH01324 Raise 1 Pillar Cut 1 310.56 220.64 1.52 3.05 1.52 including CH01324 Raise 1 Pillar Cut 1 1358.69 1198.7 0.91 3.96 3.05 and CH01324 Raise 1 Pillar Cut 1 333.77 335.08 3.66 3.66 0 CH01325 Raise 1 Pillar Cut 1 134.59 155.5 0.61 2.13 1.52 including CH01325 Raise 1 Pillar Cut 1 1146.31 1182.79 0.91 3.05 2.13 and CH01325 Raise 1 Pillar Cut 1 498.82 1042.03 2.87 2.87 0 CH01326 Raise 1 Pillar Cut 1 339.59 462.4 0.21 1.43 1.22 including CH01326 Tintic Project 95 April 25, 2024

Osisko Development Corp. Development Area Ag (g/t) Au (g/t) Length (m) Depth to (m) Depth from (m) Site ID n1 Raise 1 Pillar Cut 1 1587.57 3419.93 0.82 2.87 2.04 and CH01326 Raise 1 Pillar Cut 1 648.34 531.46 2.59 2.59 0 CH01328 Raise 1 Pillar Cut 1 2942.92 1888.17 0.46 2.59 2.13 including CH01328 Sill 8 Development 134.52 200.91 1.22 1.22 0 CH01332 Sill 8 Development 156.36 311.21 0.3 0.3 0 including CH01332 Sill 8 Development - 239.05 0.46 0.76 0.3 and CH01332 Raise 1 Pillar Cut 2 821.04 470.19 1.83 1.83 0 CH01340 Raise 1 Pillar Cut 2 2143.81 1323.93 0.61 0.61 0 including CH01340 Raise 1 Pillar Cut 2 1371.28 473.14 2.9 2.9 0 CH01346 Raise 1 Pillar Cut 2 5095.23 1753.17 0.76 1.98 1.22 including CH01346 665 (Eileen) Historic 249.84 288.82 6.1 6.1 0 CH01347 665 (Eileen) Historic 263.25 880.36 1.22 2.44 1.22 including CH01347 Raise 1 Pillar Cut 2 312.88 364.44 2.5 2.5 0 CH01348 Raise 1 Pillar Cut 2 1222.9 1470.35 0.61 2.04 1.43 including CH01348 Raise 1 Pillar Cut 2 731.43 697.81 2.74 2.74 0 CH01349 Raise 1 Pillar Cut 2 1816.49 1721.84 0.91 1.83 0.91 including CH01349 Raise 1 Pillar Cut 2 134.5 144.94 2.44 2.44 0 CH01350 Raise 1 Pillar Cut 2 222.63 245.15 0.91 2.44 1.52 including CH01350 Raise 1 Pillar Cut 2 1146.46 2311.18 2.29 2.29 0 CH01351 Raise 1 Pillar Cut 2 2673.83 5524.28 0.91 2.29 1.37 including CH01351 Raise 1 Pillar Cut 2 370.45 557.17 2.68 2.68 0 CH01352 Raise 1 Pillar Cut 2 1366.68 1865.07 0.61 2.38 1.77 including CH01352 Raise 1 Pillar Cut 2 1615.74 1633.69 2.13 2.13 0 CH01355 Raise 1 Pillar Cut 2 3441.76 5012.31 0.61 2.13 1.52 including CH01355 750 Level 52.38 6.79 0.61 1.83 1.22 CH01423 750 Level 56.81 11.69 0.15 0.82 0.67 CH01436 750 Level 558.21 20.81 0.30 0.30 0.00 CH01445 750 Level 640.46 13.94 0.30 0.30 0.00 CH01450 Decline Ramp 96.57 21.25 0.91 0.91 0.00 CH01526 Raise 4 Pillar Cut 1 62.76 30.17 1.34 1.34 0.00 CH01527 Raise 4 Pillar Cut 1 18.96 21.80 1.52 1.52 0.00 CH01539 Raise 4 Pillar Cut 1 25.23 42.75 0.73 1.52 0.79 Including CH01539 Raise 4 Pillar Cut 1 39.10 68.10 1.68 1.68 0.00 CH01548 Raise 4 Pillar Cut 1 223.14 422.49 0.24 0.24 0 Including CH01548 Raise 4 Pillar Cut 1 161.33 168.60 1.06 1.40 0.00 CH01549 Raise 4 Pillar Cut 1 262.5 288.48 0.61 0.61 0 Including CH01549 Raise 4 Pillar Cut 2 153.48 361.93 1.1 1.1 0 CH01561 Raise 4 Pillar Cut 2 259.93 590.81 0.55 0.55 0 Including CH01561 484 Sublevel 12.02 11.08 3.17 3.17 0 CH01562 484 Sublevel 9.19 17.45 1.52 1.52 0.00 Including CH01562 Raise 4 Pillar Cut 2 91.36 30.07 0.82 0.82 0 CH01564 484 Sublevel 45.63 12.96 1.52 4.57 3.05 CH01565 Raise 4 Pillar Cut 2 47.93 40.35 0.73 0.73 0 CH01566 Tintic Project 96 April 25, 2024

Osisko Development Corp. Development Area Ag (g/t) Au (g/t) Length (m) Depth to (m) Depth from (m) Site ID n1 Raise 4 Pillar Cut 2 0 443.64 1.19 1.19 0 CH01632 578 Sublevel 150.08 28.62 2.23 3.66 1.43 CH01676 578 Sublevel 247.62 62.6 0.91 2.74 1.83 Including CH01676 578 Sublevel 186.63 26.89 3.05 7.62 4.57 CH01682 578 Sublevel 439.29 77.34 0.3 4.88 4.57 Including CH01682 578 Sublevel 290.02 41.1 1.22 7.62 6.4 and CH01682 578 Sublevel 658.46 123.67 4.27 4.27 0 CH01683 578 Sublevel 583.89 103.67 0.34 0.34 0.00 Including CH01683 578 Sublevel 1961.66 134.02 0.24 0.88 0.64 and CH01683 578 Sublevel 195.2 40.25 0.24 2.04 1.8 and CH01683 578 Sublevel 2996.98 717.86 0.61 4.27 3.66 and CH01683 625 Level 67.16 40.84 3.66 4.57 0.91 CH01694 625 Level Sill 227.32 153.72 0.91 4.57 3.66 Including CH01694 625 Level 28.81 4.31 2.13 3.66 1.52 CH01698 625 Level Sill 137.68 20.84 0.3 1.83 1.52 Including CH01698 625 Level 20.77 2.99 3.66 4.57 0.91 CH01708 625 Level Sill 25.27 5.73 0.91 1.83 0.91 Including CH01708 Tintic Project 97 April 25, 2024 Table provided by Osisko Development . 3. QP C OMMENTS Micon’s QP discussed the Trixie sampling practices and procedures with Project personnel, as well as observing the underground face chip sampling during the September, 2022 site visit . Micon’s QP believes that the Trixie sampling practices and procedures are managed according to the Exploration Best Practice Guidelines established by the CIM . Micon’s QP also believes that the samples derived from the underground chip sampling practices are appropriately taken, recorded and located, and are suitable for use in the estimation of mineral resources . Trixie sampling practices and procedures were briefly discussed during the February, 2024 site visit and remain the same as those observed during the 2022 site visit . 4. R EGIONAL S URFACE E XPLORATION 1. Program Details The primary goal of the 2023 regional exploration program was to get a better understanding of the relationship between the known blind deposits of the East Tintic District and the surface lithological, alteration, geochemical, geophysical, spectral mineralogy and structural indicators which may be used to expand on known deposits and define new targets . To address this goal available historical datasets were assembled, digitized and imported into Leapfrog and ArcGIS Pro, suites of rock samples were collected from across the property, a campaign of detailed lithological and alteration mapping was conducted, and an expansion of the existing soil sample grid was completed . The footprint of mapping

Osisko Development Corp. and rock sampling covers approximately 1 , 000 hectares . While the 2023 soil sampling footprint covered approximately 830 hectares . 9.4.1.1 Lithological Data Lithological data was assembled from historical underground development and from USGS surface mapping . Prior to the 2023 field season a large - scale 3 D model was assembled in Leapfrog using all available data sources including regional cross sections, underground level maps, surface mapping, and historical drilling (Figure 9 . 10 ) . Ground truthing and detailed outcrop mapping conducted in 2023 has complimented but not significantly altered the existing surface map . The focus of the lithological mapping during the 2023 field season was two - fold : detail mapping of the exposures of pebble dikes, breccias and gossan zones and remapping of porphyry intrusions breaking them into subcategories . The mapping of breccias, pebble dikes and gossans was aimed at locating and testing zones of prospectivity by looking for useful correlation with kinematic factors or clast composition, angularity, or abundance relative to the matrix . To differentiate the different phases and distribution of the porphyritic intrusions, data was collected regarding the relative abundance, size and composition of the phenocryst minerals along with important observations about alteration, discussed below . Lithological data was collected from the field digitally, using ESRI Field Maps software, which allows the user to draw polygons, lines and points and to assign attribute data from predetermined picklists . Because this software can be programmed to prompt for additional fields based on previous selections it allows for efficient and detailed data collection without filling in redundant or non - applicable fields . Figure 9.10 3D Leapfrog Model of the East Tintic District Exploded Along Major Fault Boundaries Figure provided by Osisko Development. Tintic Project 98 April 25, 2024

Osisko Development Corp. 2. Alteration Data Compared with the detail and quality of the historical lithology dataset the alteration data is lacking . For the most part alteration minerals were not recorded in the historical level maps and sections . A detailed study of surface alteration in the district was conducted by Lovering ( 1949 ) and an accompanying surface alteration map (Lovering et al . , 1960 ) has also been very helpful . To supplement the historical datasets detailed mapping and spectral mineralogy of rock and soil samples were plotted for the newly surveyed areas . These data are very useful for mapping the hydrothermal plumbing system and vectoring toward areas where high temperature and low pH alteration minerals are abundant (indicating likely feeder zones) . Like the lithological mapping, the alteration mapping was collected using ESRI field maps . The alteration polygons were attributed with up to 4 different alteration minerals and their relative intensities . The hyperspectral data was collected at the assay lab from the coarse reject portion of each rock and soil sample . The raw spectra were analyzed using the IMDEX AISIRIS software which uses a trained AI system to output mineralogical data based on the reflectance spectra . Because the spectral data cannot identify overprinting alteration or relative intensity of rock alteration this information must be gleaned from other fields collected either in the rock samples or alteration polygons or from historical alteration mapping . 3. Geochemical Data During the 2023 field season a total of 2 , 305 soil samples were collected by Rangefront Mining Services from an East - West oriented grid with 40 m spacing within lines that were 80 m apart . This grid was an extension of the areas already sampled during the 2019 and 2021 field seasons by the TCM team . Several suites of rock samples were collected during the 2023 field season, primarily targeting the hydrothermal and magmatic systems . These included 279 samples of hydrothermal breccia, pebble dike and gossan, 80 samples of porphyry intrusions and 233 samples from the mine dumps . The combination of the wide and even distribution of the soil samples and the detailed mineralogy, alteration, structural and lithological data associated with the rock samples makes for a powerful exploration tool . Rock sample data was collected using ESRI Survey 123 software which allowed for the efficient capture of important metadata which allows for easy querying and filtering of the geochemical data once results are received . 4. Geophysical Data No new geophysical surveys were completed as part of the 2023 regional exploration program but raw data from IP and mag surveys completed in 2010 (by Rio Tinto Exploration) and 2019 (by TCM) were re - interpreted by Craig Beasley of Wave Geophysics LLC . The original IP survey over the property was conducted by Quantec Geoscience in 2010 using their proprietary Titan system with a 100 m spacing of the pole - dipoles along each of 6 lines . From the raw IP data 3 D models of chargeability and resistivity were assembled, outlining several large - scale target areas, in many cases in agreement with known deposit locations . Magnetic data came from two sources, an airborne magnetic survey conducted in 2010 by MPX Geophysics, and a smaller scale but higher resolution UAV survey flown in 2019 for TCM . The two datasets were stitched together in 2023 by Wave Geophysics and a 3 D magnetic model was produced . Tintic Project 99 April 25, 2024

Osisko Development Corp. 9.4.1.5 Structural Data From the earliest stages of exploration in the district the importance of the structural controls on mineralization was understood and therefore there is a huge amount of structural data available from the historical maps and sections . Prior to the start of the 2023 field season over 11 , 000 structural points were digitized from underground development and previous surface mapping . An additional 181 structural points were collected from surface during the 2023 field season, many of them with associated assays and metadata . This vast dataset allows for robust spatial population analysis to test how the structural regime changes across the property . The underground dataset is especially important because the volcanic cover was not subjected to Sevier and Laramide orogenies which are responsible for much of the structural priming of the underlying Paleozoic sediments . All of the 2023 structural data was collected using a Brunton Geo Transit compass and recorded using ESRI Survey 123 software . 2. Results, Analysis and Interpretations 1. Lithology Detailed outcrop mapping completed in 2023 was used to amend a digital copy of the USGS East Tintic 1 : 9600 scale lithology map . For the most part, the changes were minor, tweaking the orientation of pebble dikes or slightly shifting their mapped locations . The pebble dikes represent multiple pulses of hydrothermal activity, in many cases two phases of pebble dike are juxtaposed or may cross - cut one another (Figure 9 . 11 ) . There are also instances of rounded clasts of an earlier phase of pebble dike that have been incorporated into a later phase (Figure 9 . 11 ) . Figure 9.11 Left: Relationship of two phases of pebble dike with clast rich phase in the centre and matrix rich phase on the peripheries. Right: Rounded clast of an early pebble dike which was incorporated into a later phase dike showing characteristic onion skin spalling pattern. Figure provided by Osisko Development. Tintic Project 100 April 25, 2024

Osisko Development Corp. Additional attribute columns were added to the digitized USGS mapping to sub - divide the mapped monzonite porphyry intrusions into three subcategories (intermineral, late - intermineral and late - mineral) based on their degree of alteration which is interpreted to reflect their relative age within the magmatic system . The “freshest” of the monzonite porphyries, the late - mineral type, have all phenocrysts intact and tend to have a medium to dark green matrix reflecting a weak chlorite and smectite overprint . The Smectite in the late - mineral porphyries tends to be slightly richer in Montmorillonite compared with the monzonite porphyries mapped as late - intermineral which tend to be slightly richer in Nontronite+ - Saponite . Otherwise, the two groups show similar spectral mineralogy but with an increased intensity of alteration in those mapped as late - intermineral . The late - intermineral population tends to have a duller and paler green to beige groundmass and may show cloudy rims on the feldspars indicating partial alteration to clays . Further geochemical distinctions between the group mapped as late - mineral compared to the late - intermineral population are present in their relative enrichments in the elements associated with the mineralizing fluid and alteration in the district (Au - Ag - As - Bi - Cd - Cu - Mo - Pb - S - Sb - Se - Te - Zn) with the earlier phase showing increased enrichments compared to the later phase . The population of monzonite porphyries mapped as intermineral are the most easily discernable . They are generally strongly altered with all feldspars, or in some cases all phenocrysts completely altered to clays . Generally, the feldspar sites are occupied by kaolinite and/or dickite while original amphibole and biotite sites are often occupied by sericite . There are in some cases relict textures of an earlier biotite alteration within original amphibole sites (shreddy biotite texture) which have been further altered to white mica . Alunite is abundant within the Big Hill intermineral population but absent elsewhere, while jarosite is generally present in all the intermineral populations . B - type quartz veining was observed in both the late - intermineral and intermineral populations although in the intermineral samples there are veins with a sericite selvage (D - type veins) which are absent in the examples from the late - intermineral population . In some locations the late - mineral monzonite porphyries can be seen to cross - cut earlier, argillic altered monzonite or associated argillic alteration in the volcanics . Magnetic susceptibility is another distinguishing feature of the different porphyry phases . The intermineral porphyries are non - magnetic presumably from the mag - destructive acid fluids associated with sericitic and advanced argillic alteration . The later, fresher, phases are moderately to strongly magnetic . 9.4.2.2 Alteration The new alteration data collected during the 2023 field season includes outcrop mapping, rock sample metadata and spectral analysis of the coarse rejects of both the rock and soil samples . Because many of the clay alteration minerals have similar appearances and hardnesses it can be difficult to identify individual minerals by eye in the rock samples and outcrops in the field . However, with the combination of accurately logged alteration intensity and distribution and the objective analysis provided by the hyperspectral data a clearer and more comprehensive picture can be resolved from the rocks and outcrop datasets . The dataset with by far the largest and most consistent footprint comes from the hyperspectral mineralogy of the soils . A new regional alteration map was created using as a foundation the detailed work of Lovering et al . , ( 1960 ) and incorporating the spectral mineralogy points obtained from the soil sample grid collected during the 2023 and 2021 field seasons as well as detailed observations from the 2023 mapping and Tintic Project 101 April 25, 2024

Osisko Development Corp. sampling campaign . To make one comprehensive alteration map from the several different sources of alteration data it was easiest to group alteration minerals into categories that could be recognized in each of the data sources to varying degrees . Those were : 1) Strong Silica zones, where all or nearly all other minerals are destroyed. 2) Moderate silica zones, pervasive silica overprint but some clay minerals remain. 3) Advanced Argillic zones, rich in kaolinite, alunite, jarosite, + - dickite + - pyrophyllite. 4) Argillic zones, rich in kaolinite, white mica + - jarosite. 5) Sericitic zones, rich in white mica and kaolinite. 6) Iron - Oxide zones, rich in Goethite, Hematite, Jarosite and usually associated with elevated white mica. 7) Propylitic zones, rich in chlorite + - calcite. 8) Carbonate zones, rich in calcite + - chlorite. While the historical alteration map does an excellent job of capturing the relative intensities and footprints of the alteration zones it does less well differentiating specific clay mineralogy (e . g . the boundary of alunite rich advanced argillic alteration from argillic alteration) and does not capture many of the chlorite - rich zones . This may be because much of the chlorite in the district, as noted by Lovering ( 1949 ), is colorless, making it very difficult to discern by eye but easily recognized in the hyperspectral data . On the other hand, many of the iron - oxide minerals which are easily recognized by eye are often absent from the spectral mineralogy . Likewise, both silica and carbonate are much more easily mapped by hand since they tend not be captured well in the soil hyperspectral data . The modified alteration map of the district (Figure 9 . 12 ) shows a broad, roughly concentric zonation pattern with zones richer in carbonate and chlorite on the peripheries moving inward to a large, locally iron - oxide rich, sericitic zone that overlies most of the known epithermal mineral deposits . Further inboard there is an argillic, and finally, an advanced argillic zone centered on Big Hill . Localized zones of moderate and strong silicification probably represent the cores of fluid/vapour outflows and are mostly concentrated in the immediate vicinity of the intrusive centers at Big Hill, North Lily, and Silver Pass . Many of the pebble dikes and breccias host advanced argillic, argillic or sericitic mineral assemblages and are usually out of equilibrium with the background alteration zone into which they cut (localized zones of fluid dominant rather than rock dominant alteration) . Tintic Project 102 April 25, 2024

Osisko Development Corp. Figure 9.12 Updated Regional Alteration Map of the East Tintic District Figure provided by Osisko Development. Tintic Project 103 April 25, 2024

Osisko Development Corp. 3. Geochemistry The 2023 rock sampling campaign can be effectively subdivided into three subcategories, 1 ) sampling of pebble dikes, breccias and gossan zones as the most direct way to sample the hydrothermal plumbing system from surface, 2 ) the sampling of monzonite porphyry plugs stocks and dikes to better understand the magmatic system and to assess the potential for porphyry Cu - Au - Mo mineralization and 3 ) the sampling of the major mine - dump piles in the district with the goal of testing and constraining the proposed district scale metal zonation (e . g . moving from a Cu - Au rich core in the SW of the property outwards to Pb - Ag and eventually to Pb - Zn on the peripheries) . Dump Sampling A total of 233 dump samples were collected from 8 different mine dumps from across the property (Figure 9 . 13 ) . The mine dumps of Eureka Standard Trixie and Burgin had already been sampled under previous management bringing the total number of dump samples to 282 . Samples were collected from a 15 m - by - 15 m grid of points created over top of each dump site to remain systematic . From each sample site a select sample of any visible mineralization was collected from a ~ 1 m 2 area surrounding the point . The goal of the sampling was to try to approach the “ore - grade” of each mine . The geochemical signature of each of the mines is similar but with some significant deviations, especially in the scale of depletions (relative to average crust) seen in some of the major elements especially in Mg and Na . To test if there is a systematic zonation across the district the average grades of each of the metals of greatest interest were plotted by mine . Based on previous models of district - scale metal zonation one would predict the highest Au - Cu grades in the Southwest and the highest Pb - Zn grades in the Northeast with Ag grades greatest somewhere in the middle (see discussion by Morris ( 1964 )) . In fact, based on the geochemical data from the mine dumps, district metal zonation cannot be simplified to such an extent and to preserve a similar zoning pattern, from Au - Cu out to Pb - Zn, two discrete sources for the metals fit the data better, one near the Big Hill Intrusive centre and one just north of Trixie . Another important aspect of the dump sampling campaign was to monitor the alteration assemblage associated with the ore phase hydrothermal fluid so that it could be used to help vector towards increased prospectivity on surface . Broadly the alteration assemblages can be broken into 4 categories : 1) Dickite dominant, this best describes Apex No2, Eureka Lilly and Tintic Standard No2 dumps each also have significant contributions of white mica, silica and Kaolinite. 2) Kaolinite dominant, describes North Lily and Big Hill dumps, each also have significant Pyrophyllite and Alunite which are mostly absent from the other mine dumps. 3) Silica rich, both Iron King No1 and No2 show a similar alteration assemblage with significant contributions from silica, white mica, Kaolinite and Dickite. 4) Zuma, this assemblage is distinct from the other mines in the district by the dominance of white mica and the presence of Serpentine and Smectite. Tintic Project 104 April 25, 2024

Osisko Development Corp. Figure 9.13 Location Map of the 2023 Dump Samples Figure provided by Osisko Development. Tintic Project 105 April 25, 2024

Osisko Development Corp. Pebble Dike, Breccia and Gossan Zone Sampling A total of 319 surface rock samples were collected during the 2023 season from pebble dikes, breccias, gossans or other prospective/altered zones . Sampling methodology varied depending on exposure and breccia type but generally an attempt was made to collect a rock sample approximately every 20 m to 30 m along linearly continuous structures to meaningfully test variability along strike . The distribution of these samples was intended to cast a wide net over the district, sampling over known deposits as well as outside of the known deposit outlines to test what factors are most useful for determining the locations of the blind mineral deposits . Figure 9 . 14 shows the various geographic zones selected for breccia and gossan sample analysis . The geographic zones selected were as follows : 1 ) Baltimore, 2 ) Hannibal Hill, 3 ) Tintic Bullion, 4 ) Endline extension, 5 ) Ballpark North, 6 ) Ballpark South, 7 ) No 7 Zone, 8 ) South Fault Zone, 9 )Mineral Hill, 10 ) No 10 Zone, 11 ) East Trixie, 12 ) West Trixie, 13 ) Zuma West, 14 ) Big Hill Target Area, 15 ) East Tintic Coalition, 16 ) Eureka Lilly Fault Zone . Figure 9 . 15 graphically illustrates the average values of the commodities of interest from breccia samples within each of the geographically defined zones . Monzonite Porphyry Sampling A total of 80 rock samples were collected from monzonite porphyry intrusions across the property with the goal of combining geochemical and spectral data with observations from the field to help categorize the intrusions and to delineate zones of higher potential for porphyry Cu - Au - Mo mineralization . For this study the district was subdivided geographically into three “intrusive centres” from south to north they are Trixie West, Big Hill and North Lily (Figure 9 . 16 ) . While none of the porphyry intrusions exposed on surface host economic mineralization there are positive geochemical indicators for potential porphyry mineralization at depth . Using the geochemical framework of Cohen ( 2011 ) (Figure 9 . 17 ) the different populations of intrusions were assessed . Within each of the intrusive centers, the more altered samples are significantly enriched in Au - As - Bi - Mo - Pb - S - Te and depleted in Ca - Co - Mg - Mn - Ni - Zn . This alteration signature is what would be expected roughly 1 to 2 km above the level of Cu mineralization (If it is present) . Soil analysis using the element thresholds defined by Cohen ( 2011 ) indicate anomalous values of Tl, Li, Sb, Bi, Te, As, Se, and Sn are above the defined threshold limit, but W, Mo and Cu anomalies are not . These observations also are consistent with a minimum depth to potential copper mineralization of ~ 1 km . Tintic Project 106 April 25, 2024

Osisko Development Corp. Figure 9.14 Geographic Zones Selected for Breccia and Gossan Sample Analysis Figure provided by Osisko Development. Tintic Project 107 April 25, 2024

Osisko Development Corp. Figure 9.15 Average Values of Commodities of Interest from Breccia Samples within Each of the Geographically Defined Zones Figure provided by Osisko Development. Tintic Project 108 April 25, 2024

Osisko Development Corp. Figure 9.16 Location Map of Porphyry Samples and Subdivision of Intrusive Centres Used for Analysis Figure provided by Osisko Development. Tintic Project 109 April 25, 2024

Osisko Development Corp. Figure 9.17 From Cohen (2011) Showing the Relative Position and Scale of Geochemical Variations Associated with the Ann Mason Porphyry Copper Deposit, Nevada. Figure provided by Osisko Development . 9.4.3 Targeting and Exploration Potential One of the primary goals of the 2023 regional program was to develop drill - ready targets for future testing . Given the vast amount of available data from a wide range of sources and potential for multiple different deposit types in the district, the goal of this exercise was to remain as objective as possible and not be overly influenced by any one dataset . To do this, polygons were drawn in 29 different feature classes representing areas of anomalous prospectivity . For soil geochemistry each element of interest or metric was filtered to the 90 th percentile before polygons were drawn over areas where at least two adjacent soils were above the threshold . Similarly, rock sample points were first filtered to remove mine dump samples then further filtered to 90 th percentile and 30 m buffers were drawn . Buffers were also drawn around mapped breccia zones, pebble dikes, gossan zones and major faults . Favorable alteration polygons included areas of mapped Advanced argillic, sericitic, Iron - Oxide - rich and moderate to strong silica . Polygons representing the favorable zones of chargeability, resistivity and magnetism were also included . Underground mine workings were projected to surface with a 30 m Tintic Project 110 April 25, 2024

Osisko Development Corp. buffer added . Points with a 30 m buffer were also added at each of the mapped prospects, shaft collars and adit entrances . Using GIS software each of the polygon feature classes were added together to produce a single output layer with an attribute column containing the count of overlapping prospectivity . The resulting map is shown in Figure 9 . 38 . Figure 9.18 Regional Prospectivity and Target Heat Map Showing Areas of Greatest Overlap in Favourable Characteristics in Hotter Colours Figure provided by Osisko Development. From the targeting methodology described above, a total of 15 primary targets and 10 secondary targets were identified (Figure 9.19). Of the 15 primary targets eight of them overlie zones of known Tintic Project 111 April 25, 2024

Osisko Development Corp. mineralization, which is a good sign that the methodology works . For each of those eight primary targets overlying known historical mines or mineralization, the exploration potential is based on the available underground mapping and ore grades from historical production records . The additional targeting in these mines comes primarily from four categories : 1) Locations and orientations of economically mineralized structures are already known . Because of extensive historical underground exploration and high - quality geological mapping much is already known about the locations, nature and orientation of the veins and breccias that will be targeted . This will considerably reduce the cost that would normally be incurred determining these characteristics . 2) Changes to the value of metals . Most of the mines under consideration were closed due to unfavourable economic conditions between 1940 and the mid 1950 ’s . Since that time the inflation adjusted gold price has more than tripled (https : // www . macrotrends . net/ 1333 /historical - gold - prices - 100 - year - chart), meaning that much of the material that would have been deemed sub - economic at the time of mining will be above current cut - off grades . 3) Historical mining followed mineralization down to the elevation of the contemporary water table and stopped there, leaving all these deposits open at depth . Since the water table has dropped since ca . 1950 more mineralized material, even above the historical cut - off grades will now be accessible . 4) High probability of sub - parallel breccia/vein structures . The nature of the breccia/vein hydrothermal systems makes it likely that multiple sub - parallel structures would have been exploited in the pathway of the fluid/vapour outflows . So, by drilling at a high angle to the structures the potential of intersecting so far undiscovered and sub - parallel veins is maximized . Figure 9.19 Left: Fifteen Primary Targets Identified Over Areas of Greatest Overlap in Prospectivity. Right: Ten Secondary Targets with Smaller Footprints and Less Overlap in Prospectivity Figure provided by Osisko Development. • • • • • • • • • • Tintic Project 112 April 25, 2024

Osisko Development Corp. 1. DRILLING 2. D RILLING P ROGRAM 1. Underground Diamond Drilling On October 3 , 2022 , Nasco Industrial Services and Supply LLC . (NISS) commenced drilling the Trixie deposit and by December 19 , 2022 had completed 990 . 6 m ( 3 , 250 ft) of underground diamond drilling in 28 drill holes . In 2023 , NISS completed an additional 6 , 028 m ( 19 , 776 ft) of underground drilling in 73 holes at Trixie . A total 122 new holes from the remainder of the 2022 drilling and 2023 drilling were included in the updated MRE . Drilling locations are presented in Figure 10 . 1 Underground holes were drilled in vertical fans oriented semi - orthogonally to the strike of the deposit . Multiple fans were drilled from each underground drill bay with both up and down holes ranging from dips of + to - 55 Σ averaging 67 m ( 220 ft) per hole . In October, 2023 , one hole commenced drilling to test for a copper - moly - gold porphyry target below the Trixie deposit . This hole was drilled to a depth of 626 m ( 2 , 054 ft) . At the time of data cut - off, assays are pending for this hole . This hole was not included in the Trixie MRE . 2. Surface RC Drilling Surface RC drilling of the Trixie Deposit commenced in July, 2022 . Layne Christensen Company (Layne) was the drilling contractor for this program and drilled until December, 2022 . A total of 8 , 770 m ( 28 , 773 ft) was drilled in 28 holes in 2022 . The RC assays from 20 holes were returned in 2023 and are included in this report . Figure 10 . 2 illustrates the location of the RC drilling . 3. Surface Diamond Drilling On December 1 , 2023 , Major Drilling commenced drilling on the copper - moly - gold target at Big Hill . By the end of 2023 , a total of 390 m ( 1 , 277 ft) had been drilled on the first hole . Initial target depths for the holes are 1 , 524 m ( 5 , 000 ft) . 2. D RILLING M ETHODOLOGY 1. Underground Diamond Drilling Both U 6 and Versa diamond drill rigs were used to complete the underground drilling . All underground holes were collared using a HQ core size, with the expectation of obtaining HQ core across the targeted mineralized zones . Geological logging and sampling were completed onsite, with all samples comprised of half core dispatched to ALS’s Reno and Elko laboratories and SGS Canada for offsite sample preparation and analysis by fire assay, multi - element four - acid digest, and screen metallics . All assay batches include Tintic Project 113 April 25, 2024

Osisko Development Corp. full QA/QC standard and blank inserts . ALS is an independent assaying laboratory which uses ISO/IEC 17025 : 2017 accredited methods in North America . The SGS laboratories are ISO/IEC 17025 certified for the analytical methods used routinely on the samples from Trixie . The ALS and SGS facilities are commercial laboratories which are independent of Osisko Development . Figure 10.1 2023 Underground Diamond Drill Hole Collar Locations Figure provided by Osisko Development. Tintic Project 114 April 25, 2024

Osisko Development Corp. Figure 10.2 Surface RC Drill Locations Figure provided by Osisko Development. Tintic Project 115 April 25, 2024

Osisko Development Corp. 2. Surface RC Drilling Schramm 480 and Schramm 625 truck, track and buggy mounted RC drill rigs were used to complete the surface RC drilling . All surface holes were cased through overburden . Both centre - feed and regular - feed, 4 ½” RC hammers were used during penetration, as well as tri - cone bits, as warranted by the ground conditions . A lobed interchange was used or removed as needed to control drill hole deviation . All drill holes were drilled wet, using water and drilling muds to reduce dust and stabilize the drill holes. Intervals with little to no return or sample material were recorded as “NS” for “No Sample”. Chip samples were collected continuously in every 5 - foot run from a drill - mounted cyclone, using a 30 / 70 splitter . Thirty percent of the continuous sample was collected in cloth filter bags for assay, while seventy percent was collected in 20 ”x 30 ” clear plastic poly bags, as a reject to be retained on site . A small fraction of chips was caught by a metal mesh sieve and saved in plastic chip sample trays for logging on site . Samples were sent to ALS Geochemistry’s Reno and Elko, Nevada, laboratories, for independent third - party sample preparation, with analysis by fire assay, multi - element four - acid digest, and screen metallics . All assay batches include full QA/QC standard and blank inserts . 3. Surface Diamond Drilling A truck mounted LF230 drill rig was used for the surface diamond drilling by Major Drilling (Figure 10.3). Surface holes are cased through overburden at PWT diameter and collared using PQ core size, with the expectation of reducing and obtaining HQ samples across the target zones at depth . Geological logging and sampling were completed onsite, with all samples comprised of half core dispatched to ALS’s facilities in Reno and Elko for offsite sample preparations and analysis by fire assay, multi - element four - acid digest, and screen metallics . All assay batches include full QA/QC standard and blank inserts . 4. Drilling Highlights and Results The 2023 initial Trixie MRE included assays for eight RC holes . The results from the remaining 20 holes were received in 2023 and are incorporated into this report . Assay highlights are summarized in Table 10 . 1 . The RC drilling was designed to explore approximately 600 m to the northeast of Trixie . Subsequent RC holes were planned along strike to test north of the T 2 domain, and further to the south to explore for mineralized structures to be followed up with underground core drilling . Assay highlights from the underground diamond drilling program are summarized in Table 10 . 2 . Cross - section locations for surface and underground drilling are shown in Figure 10 . 4 and Figure 10 . 5 . Tintic Project 116 April 25, 2024

Osisko Development Corp. Figure 10.3 Surface Drill Rig at Big HIll Figure provided by Osisko Development. Table 10.1 2022 Surface RC Drilling Assay Highlights Ag (g/t) Au (g/t) Length (m) Depth to (m) Depth from (m) Hole ID 3.55 3.47 3.05 362.71 359.66 TRC038A 29.29 2.7 24.38 249.94 225.55 TRC121 155 20.3 1.52 249.94 248.41 Including TRC121 Table provided by Osisko Development. Tintic Project 117 April 25, 2024

Osisko Development Corp. Table 10.2 2022 and 2023 Underground Diamond Drilling Assay Highlights Tintic Project 118 April 25, 2024 Ag (g/t) Au (g/t) Length (m) Depth to (m) Depth from (m) Hole ID 30.60 48.20 0.76 8.38 7.62 TUG - 625 - 032 249.00 354.00 0.46 3.96 3.51 TUG - 625 - 033 220.00 128.50 0.52 2.74 2.23 TUG - 625 - 034 175.81 17.63 3.96 20.57 16.61 TUG - 625 - 034 50.19 7.51 5.79 31.55 25.76 TUG - 625 - 034 41.86 32.89 3.20 4.72 1.52 TUG - 625 - 035 68.60 76.80 1.01 4.72 3.72 Including TUG - 625 - 035 30.89 36.81 3.35 4.27 0.91 TUG - 625 - 036 65.00 134.50 0.61 2.44 1.83 Including TUG - 625 - 036 45.08 20.88 5.64 7.01 1.37 TUG - 625 - 037 60.40 42.00 0.76 5.94 5.18 Including TUG - 625 - 037 397.00 154.00 0.46 7.01 6.55 and TUG - 625 - 037 90.24 53.27 2.44 12.04 9.60 TUG - 625 - 037 177.00 105.50 0.91 11.43 10.52 Including TUG - 625 - 037 207.55 67.01 0.94 4.45 3.51 TUG - 625 - 038 860.00 240.00 0.18 4.45 4.27 Including TUG - 625 - 038 71.36 13.44 3.05 28.96 25.91 TUG - 625 - 051 32.59 10.68 4.88 28.04 23.16 TUG - 625 - 052 52.10 27.20 1.13 24.29 23.16 Including TUG - 625 - 052 18.70 91.30 1.34 35.66 34.32 TUG - 625 - 053 301.00 84.40 0.73 2.90 2.16 TUG - 625 - 085 163.56 15.61 2.44 25.91 23.47 TUG - 625 - 085 96.98 27.26 4.57 4.57 0.00 TUG - 625 - 086 244.00 39.10 0.79 0.79 0.00 Including TUG - 625 - 086 105.00 54.50 1.22 3.05 1.83 and TUG - 625 - 086 98.80 46.50 2.74 20.73 17.98 TUG - 625 - 086 404.19 28.72 6.25 22.71 16.46 TUG - 625 - 087 1240.00 81.50 0.61 17.07 16.46 Including TUG - 625 - 087 968.00 118.00 0.46 18.14 17.68 and TUG - 625 - 087 92.58 12.64 5.18 27.43 22.25 TUG - 625 - 088 162.00 31.50 1.22 26.82 25.60 Including TUG - 625 - 088 95.05 12.46 4.57 4.57 0.00 TUG - 625 - 093 272.00 47.20 0.76 1.52 0.76 Including TUG - 625 - 093 104.00 26.70 1.31 2.83 1.52 TUG - 625 - 094 38.15 10.78 3.96 21.34 17.37 TUG - 625 - 094 246.00 57.50 0.76 31.55 30.78 TUG - 625 - 094 325.00 52.30 1.13 1.13 0.00 TUG - 625 - 099 106.00 78.80 0.64 5.82 5.18 TUG - 625 - 100 69.90 42.10 1.37 12.50 11.13 TUG - 625 - 100 60.26 16.86 4.54 21.46 16.92 TUG - 625 - 100

Osisko Development Corp. Ag (g/t) Au (g/t) Length (m) Depth to (m) Depth from (m) Hole ID 114.00 30.80 2.26 21.46 19.20 TUG - 625 - 100 91.30 31.00 1.07 3.51 2.44 TUG - 625 - 101 238.00 229.00 0.76 5.79 5.03 TUG - 625 - 102A 76.67 19.77 4.57 19.81 15.24 TUG - 625 - 103 58.79 23.49 1.37 4.42 3.05 TUG - 625 - 106 58.54 19.54 1.98 8.69 6.71 TRXU - DD - 23 - 001 40.63 43.44 0.91 32.31 31.39 TRXU - DD - 23 - 003 231.46 62.82 6.86 45.11 38.25 TRXU - DD - 23 - 003 707.00 191.00 1.07 40.54 39.47 Including TRXU - DD - 23 - 003 393.00 117.00 1.68 42.21 40.54 and TRXU - DD - 23 - 003 255.00 49.11 1.07 55.78 54.71 TRXU - DD - 23 - 003 26.12 7.95 7.32 15.85 8.53 TRXU - DD - 23 - 005 38.51 10.67 4.27 28.04 23.77 TRXU - DD - 23 - 005 98.15 28.70 1.52 124.66 123.14 TRXU - DD - 23 - 016 13.43 7.67 11.58 87.17 75.59 TRXU - DD - 23 - 018 26.35 21.81 1.52 77.11 75.59 TRXU - DD - 23 - 018 26.35 21.81 1.52 77.11 75.59 Including TRXU - DD - 23 - 018 19.47 35.07 1.07 87.17 86.11 and TRXU - DD - 23 - 018 344.39 65.00 4.57 50.29 45.72 TRXU - DD - 23 - 026 4.00 7.66 7.32 79.86 72.54 TRXU - DD - 23 - 035 7.96 38.03 1.22 78.03 76.81 Including TRXU - DD - 23 - 035 34.87 14.85 5.49 89.00 83.52 TRXU - DD - 23 - 035 25.70 27.02 1.83 89.00 87.17 Including TRXU - DD - 23 - 035 1143.21 54.95 2.59 39.01 36.42 TRXU - DD - 23 - 045 2715.00 130.00 1.07 37.49 36.42 Including TRXU - DD - 23 - 045 11.77 2.95 10.97 106.38 95.40 TRXU - DD - 23 - 060 740.43 102.67 1.07 37.19 36.12 TRXU - DD - 23 - 061 1644.00 281.00 0.30 37.19 36.88 Including TRXU - DD - 23 - 061 101.98 5.79 13.72 107.90 94.18 TRXU - DD - 23 - 065 140.85 13.01 2.90 67.97 65.07 TRXU - DD - 23 - 066 206.00 19.96 1.52 66.60 65.07 TRXU - DD - 23 - 066 35.29 10.84 4.57 107.90 103.33 TRXU - DD - 23 - 066 151.04 23.89 9.45 85.04 75.59 TRXU - DD - 23 - 068 98.14 81.23 0.76 76.96 76.20 Including TRXU - DD - 23 - 068 220.00 37.34 1.07 81.69 80.62 and TRXU - DD - 23 - 068 330.00 52.50 0.61 82.30 81.69 and TRXU - DD - 23 - 068 167.64 66.04 8.99 32.46 23.47 TRXU - DD - 23 - 072A 1523.00 610.00 0.46 31.09 30.63 Including TRXU - DD - 23 - 072A 691.00 180.00 0.76 31.85 31.09 and TRXU - DD - 23 - 072A Tintic Project 119 April 25, 2024 Table provided by Osisko Development.

Osisko Development Corp. Figure 10.4 2023 Underground Diamond Drilling with Assays on Section 23280 N. Looking North Figure provided by Osisko Development. Tintic Project 120 April 25, 2024

Osisko Development Corp. Figure 10.5 Underground Diamond Drilling with Assays on Section 23000 N. Looking North Figure provided by Osisko Development. Tintic Project 121 April 25, 2024

Osisko Development Corp. 3. A DDITIONAL D RILLING C ONSIDERATIONS Average diamond drill production of 12 . 2 m ( 40 ft) per day was typical of the 2023 program with all - in drilling costs around $ 213 /ft . Difficult drilling conditions addressed in previous reports have continued at Trixie . Recovery in the diamond drilling program averages a reasonable 90 . 1 % , however the core suffers significant destruction during the drilling process, resulting in difficult interpretations of significant mineralized structures, and increased uncertainty in the rock quality designation and recovery data . Broken ground, significant faulting and hard abrasive lithologies have resulted in slow sample production and further compromised the structural interpretation . In addition, the lack of structural data made true - width relationships difficult to determine from the drilling . A significant difference in assay grade is seen between the drilling results and results taken from underground face sampling at Trixie . Underground samples typically show grades in 100 ’s to 1 , 000 ’s of grams per tonne ( 10 ’s to 100 ’s troy ounces per ton) whereas drilling results show only occasional grades greater than 100 g/t Au (Table 10 . 2 ) . Sludge samples were collected from holes TRXU - DD - 23 - 057 to TRXU - DD - 23 - 072 , to investigate for gold washed out in fine material from drill cuttings . The results indicated anomalous sludge sample assays correlated with anomalous drill core assays . A total of five exploration cross - cuts were constructed to investigate the correlation with drill hole data and face sampling, further to the south and cross cutting the T 2 , T 4 and 75 - 85 zones . The face sampling correlated with the drill hole results . Lastly, any sample that had logged T 2 lithologies or grade greater than 1 . 0 g/t Au were re assayed using screen metallic analysis, to gain a bigger sample and compare screen metallics with fire assay . The results were comparable . It is concluded that the drill hole data is are representative and accurate of the gold at Trixie . The expression, “Drill for structure, mine for grade” can be applied at Trixie . 4. D RILLING P ROGRAM R ECOMMENDATIONS Further underground diamond drilling is recommended at Trixie for 2024 , to increase the size of the deposit . Figure 10 . 6 illustrates the priority target areas at Trixie . It is recommended to drill test the down dip extent of the 756 with the newly rehabilitated workings at the 750 level . Historical assays within the 756 were documented at average grades of 5 . 0 g/t Au (Morris and Lovering, 1979 ), however additional parallel structures similar to T 2 grades are also targeted within this area . It is also recommended to focus on step outs along strike of the known T 2 and T 4 mineralization to the north . The down plunge area south towards the predicted intersection of the Sioux Ajax fault has been tested to the extent possible with current development . It is also recommended to continue rehabilitating the workings along the 750 level to the south, so that additional areas can be tested down plunge of 75 - 85 and down dip of the historical stopes from the Survey Vein . Additional drilling to the west to test for parallel structures of T 2 is recommended . Additional porphyry drilling is recommended at Trixie, as there is a marked increase of alteration and hydrothermal breccia west of the Eureka Lilly fault . This drilling can also be collared from the 750 Level . Surface drilling is recommended at Big Hill and other regional targets outlined in Section 9 . A combination of RC and diamond drilling is recommended for these targets . Tintic Project 122 April 25, 2024

Osisko Development Corp. Figure 10.6 Trixie Target Areas (Looking East) Figure provided by Osisko Development . 10.5 M ICON QP C OMMENTS Micon’s QP reviewed the drilling and sampling procedures at Trixie during both the September, 2022 and February 2024 site visits and in further discussions with Osisko Development personnel after the site visits . Micon’s QP believes that despite the challenges encountered during the Trixie drilling programs, the drilling and sampling procedures have been and are being conducted with industry best practices in mind, such as those outlined by CIM . Therefore, the surface and underground drilling can be appropriately included as part of the database which serves as the basis for the current mineral resource estimates . Tintic Project 123 April 25, 2024

Osisko Development Corp. 1. SAMPLE PREPARATION, ANALYSES AND SECURITY 2. I NTRODUCTION The following section describes the preparation, analysis and security procedures used for all underground face chip and drill core samples collected during 2022 and 2023 at the Trixie test mine which are used in the current resource estimate . Samples collected prior to 2022 and which are included in the current resource estimate were validated by Dr . Thomas A . Henricksen QP, C . P . G . and are considered to meet generally accepted industry standards for sample preparation, analysis, QA/QC and security protocols . Micon’s QP has reviewed the material related to the samples validated by Dr . Henricksen and believes that they meet generally accepted industry standards, as outlined by CIM, and are therefore suitable to be used as the basis for a mineral resource estimate . 2. S AMPLE H ANDLING AND S ECURITY Sample handling and security procedures are managed by TCM personnel . These procedures are described below . 1. Underground Chip Sampling All underground chip samples are collected by TCM mine geologists from each of the active faces during each shift . Chip samples are collected and do not exceed 0 . 91 m ( 3 ft) in length . The face is washed for safety, and for better identification of mineralization, alteration and structures . The hangingwall and footwall of the structures are marked on the face and back . Sample intervals are marked up and follow lithological contacts . Samples are transported by the geologist from the Trixie test mine to the onsite Tintic laboratory at the Burgin administrative complex . 2. Drill Core Sampling Following extraction from the core tube, underground diamond drill core is placed in wax - impregnated core boxes with depths marked by wooden marking blocks . The boxes are labelled with the drill hole number, the box number, and the depth interval, then lidded and taped shut . Boxes are brought to surface daily by miners and picked up by TCM logging geologists and geotechnicians and delivered to the TCM logging facility . At the core logging facility, drill core is marked with footage depths, and recovery and rock quality are measured and recorded . Geologic and geotechnical information is logged and input into Datamine’s DHLogger software and synchronized to a central database . Sample intervals are marked with aluminum tags and unique sample identification numbers, and input into DHLogger, as well . Drill core is then photographed and sent to the core cutting facility . TCM core cutters half - cut the drill core using an Almonte Automated Core Saw . Half the core is placed back in the core box and the other half is placed in a calico or plastic sample bag, labelled with the corresponding sample identification number . Boxes of half - cut core are palleted and moved to core storage . Sample bags are moved to a staging area for dispatch to an analytical laboratory . Tintic Project 124 April 25, 2024

Osisko Development Corp. During staging for dispatch, standard and blank samples are inserted into the sample sequence for QA/QC . Bagged samples are then placed in rice bags in groups of five to ten samples, depending on weight . Rice bags are labelled with a unique shipment ID and sequential numbering (eg : Bag 1 , Bag 2 ) . A sample list and sample submittal form are inserted into the first bag for each shipment, then the bags are sealed with metal ties, loaded on pallets, and secured using clear shrink wrap . All samples are shipped to ALS Analytical Laboratories via Old Dominion Shipping . Copies of a manifest and chain of custody form are given to TCM and Old Dominion . 11.2.3 Reverse Circulation Drill Chip Sampling During the RC drilling process, rock chips are lifted to surface with air and water pressure . Chips are run through a cyclone attachment on the drill tower, fitted with splitters which cause a 1 : 2 split of the chips . At five - foot intervals, a third of the chips are separated into cloth filter bags for sampling, while two thirds are separated in polyethylene bags for storage as reject material . Once per five - foot interval, a coarse mesh sieve is inserted into the reject outflow from the cyclone to collect a small, representative chip sample . This sample is placed in chip sample trays for logging . Once per fifty - foot interval, an additional splitter is added to the cyclone to divide the sampled chips into a sample and a duplicate for QA/QC purposes . Any water overflow from the cyclone outflow is caught with a - 80 - mesh sieve to prevent the loss of fine material . Bags are sealed and laid out to dry on the drill pad . Sample bags and chip trays are collected from the drill pad by TCM logging geologists and geotechnicians and delivered to the TCM logging facility . Geologic information is logged into Datamine’s DHLogger software and synchronized to a central database . Chip trays are then photographed . During staging for dispatch, standard and blank samples are inserted into the sample sequence for QA/QC . Samples are then placed in rice bags in groups of five to ten samples, depending on weight . The bags then follow the numbering and shipping procedure described above for the core samples . 3. A SSAY L ABORATORIES A CCREDITATION AND C ERTIFICATION The International Organization for Standardization (ISO) and the International Electrotechnical Commission (IEC) form the specialized system for worldwide standardization . ISO/IEC 17025 , General Requirements for the Competence of Testing and Calibration Laboratories, sets out the criteria for laboratories wishing to demonstrate that they are technically competent, employ an effective quality control system, and able to generate technically valid calibration and test results . The standard forms the basis for the accreditation of competence of laboratories by accreditation bodies . ISO 9001 applies to management support, procedures, internal audits and corrective actions . It provides a framework for existing quality functions and procedures . 1. ALS Laboratory All 2022 drill core and RC chip samples were submitted to the ALS laboratory in either Twin Falls, Idaho or Elko, Nevada . Analysis of the drill core and RC chip samples was completed in the ALS laboratory in either Reno, Nevada or North Vancouver, British Columbia . These ALS laboratories are ISO 9001 certified and ISO/IEC 17025 certified for the analytical methods used routinely on the samples from Tintic Project 125 April 25, 2024

Osisko Development Corp. Trixie . The ALS facilities are commercial laboratories, independent of Osisko Development Corp . and have no interest in the Tintic Project . 2. SGS Laboratory All 2023 drill core samples were submitted to the SGS Laboratory in Burnaby, British Columbia . Analysis of the drill core was completed in the SGS laboratory in either Burnaby, British Columbia or Lakefield, Ontario . These SGS laboratories are ISO/IEC 17025 certified for the analytical methods used routinely on the samples from Trixie . The SGS facilities are commercial laboratories, independent of Osisko Development Corp . and have no interest in the Tintic Project . 3. Tintic Laboratory Underground chip samples are submitted to the onsite Tintic laboratory at the Burgin administrative complex . The Tintic laboratory is not a certified analytical laboratory, but the facility is managed by a qualified laboratory manager, with annual auditing by independent technical staff . Inter - laboratory check assays using ALS Laboratory as a third - party independent analysis of samples are routinely carried out as part of ongoing QA/QC work . An independent audit/inspection of the Tintic laboratory facilities was conducted in May, 2022 by Qualitica Consulting Inc . (Qualitica Consulting) . A report of recommendations was provided to Osisko Development and implemented . A new preparation laboratory was constructed in 2022 and a full - time laboratory manager is on site to monitor ongoing QA/QC and to troubleshoot any issues that arise in the laboratory . 4. S AMPLE P REPARATION AND A SSAYING 1. ALS Sample Preparation The following outlines ALS laboratories sample preparation procedures :  Samples are sorted and logged into the ALS LIMS program.  Samples are dried and weighed.  Samples are crushed to +70% passing 2 mm (CRU - 31).  A crushed sample split of up to 500 g is pulverized to +85% passing 75 μm (PUL 32m).  Once analysis is complete, pulp material is returned to TCM for storage and coarse rejects are disposed of after 90 days. 2. ALS Gold Assaying The following outlines ALS laboratories assay procedures used on the Trixie mineralization :  A 50 - g pulp aliquot is analyzed by Au - AA26: fire assay followed by aqua regia digestion (HNO 3 - HCl), with an atomic absorption spectroscopy finish (AAS). Tintic Project 126 April 25, 2024

Osisko Development Corp.  When assay results are higher than 100 g/t Au, a second 50 - g pulp aliquot is analyzed by Au - GRA 22 : fire assay, parting with nitric acid (HNO 3 ), with a gravimetric finish .  Selected samples are analyzed by metallic screen . The + 100 μm fraction (Au+) is analyzed in its entirety by fire assay with gravimetric finish . The minus 100 μm fraction is homogenized and two subsamples are analyzed by fire assay with AAS (Au - AA 25 ) or gravimetric finish (Au - GRA 21 ) . The average of the two minus fraction subsamples is taken and reported as the Au - fraction result . The gold content is then determined by the weighted average of the Au+ and Au - fractions .  Chip sample duplicates were also analyzed using ME - GRA 22 : fire assay, parting with nitric acid (HNO 3 ) with a gravimetric finish . This method reports values for Au and Ag . 3. ALS Multi - Element Assaying The following outlines ALS Laboratories assay procedures used for multi - element assaying :  Some samples are analyzed by the trace - level multi - element method ME - MS 61 : a 0 . 25 - g aliquot is digested by four - acid digestion (HNO 3 - HClO 4 - HF - HCl) and HCl leach (method GEO - 4 A 01 ) and analyzed by ICP - AES .  Following this analysis, the results are reviewed for high concentrations of bismuth, mercury, molybdenum, silver and tungsten and diluted accordingly . Samples meeting these criteria are then analyzed by ICP - MS . Results are corrected for spectral interelement interferences . 4. SGS Sample Preparation The following outlines SGS laboratories sample preparation procedures :  Samples are sorted and logged into the SGS LIMS program.  Samples are dried and weighed.  Samples are crushed to +75% passing 2 mm (G_CRU - CRU75).  A crushed rotary sample split of up to 250 g is pulverized to + 90 % passing 75 μm (G_PUL - PUL 90 _CR 250 ) . Once analysis is complete pulp material is returned to TCM for storage and coarse rejects are disposed of after 90 days. 5. SGS Gold Assaying The following outlines SGS laboratories assay procedures used on the Trixie mineralization:  A 30 - g pulp aliquot is analyzed by GO_FAA30V10: fire assay followed by aqua regia digestion (HNO 3 - HCl) with an atomic absorption spectroscopy finish (AAS).  When assay results are higher than 100 g/t Au, a second 30 - g pulp aliquot is analyzed by GO_FAG30V: fire assay, parting with nitric acid (HNO 3 ) with a gravimetric finish. Tintic Project 127 April 25, 2024

Osisko Development Corp.  Selected samples are analyzed by metallic screen . The + 106 μm fraction (plus) is analyzed in its entirety by fire assay with gravimetric, AAS or ICP - AES finish . The - 106 μm fraction (minus) is homogenized and two subsamples are analyzed by fire assay with gravimetric, AAS or ICP - AES finish . The average of the two minus fraction subsamples is taken and reported as the Au - fraction result . The gold content is then determined by the weighted average of the Au+ and Au - fractions . 6. SGS Multi - Element Assaying The following outlines SGS Laboratories assay procedures used for multi - element assaying :  Some samples are analyzed by trace - level multi - element method GE_ICM 40 Q 12 : a 0 . 5 - g aliquot is digested by four - acid digestion (HNO 3 - HClO 4 - HF - HCl) and analyzed by ICP - OES and ICP - MS, with the method depending on the element .  Overlimits for selected elements are analyzed by the ore - grade method GO_ICP 42 Q 100 : a 0 . 5 - g aliquot is digested by four - acid digestion (HNO 3 - HClO 4 - HF - HCl) and analyzed by ICP - OES . 7. Tintic Laboratory Sample Preparation The Tintic laboratory sample preparation procedures are outlined as follows :  The samples are loaded into a drying oven to remove any moisture .  After drying, the sample order is confirmed on the submittal form . Any discrepancies are brought to the geology group’s attention and resolved .  Each sample is prepared using a belt elevator feeding into a jaw crusher, then directly into a gyratory crusher reducing sample particle size to approximately 3 . 5 mm .  The sample is then introduced to a rotary splitter to reduce volume and maintain representation of the entire sample . The rotary table has 12 paired pans which are selected randomly until an approximate 2 , 000 - gram split is available for pulverizing .  Pulverizing is achieved by feeding the selected sample split into a vibratory feeder that feeds a disc pulverizer .  The finely ground sample is then introduced to a small Jones splitter and further reduced to approximately 250 - grams and inserted into a sample packet, ready for assaying . 8. Tintic Laboratory Gold and Silver Assaying The following outlines Tintic Laboratory assay procedures :  Each prepared sample packet is forwarded to the fire assay laboratory, where a routine 1 assay ton assay is performed . This assay uses lead as a collector for any precious metals in the fusion step and then oxidizes the lead using a cupel (magnesia cup) to separate the precious metals from the lead . Tintic Project 128 April 25, 2024

Osisko Development Corp.  The remaining “bead” of precious metals is referred to as a doré bead . The Assayer will tap each doré bead with a hammer to remove any residual cupel and then place the bead in a ceramic cup .  The doré beads are then forwarded to the Balance room where each is weighed, using a micro - balance and the weight is recorded .  A 25 % concentrate volume of nitric acid is added to each ceramic cup containing a doré bead and placed on a hotplate . The nitric acid dissolves silver leaving only the gold as a solid .  The solution is decanted from the cup, the cup and gold are rinsed with deionized water, and then returned to the hotplate to dry . The dry cup and gold are annealed, and after cooling, the gold is weighed on the micro - balance and weight recorded . 5. Q UALITY A SSURANCE AND Q UALITY C ONTROL This section summarizes the 2022 and 2023 TCM QA/QC program, including the QA/QC procedures used internally at the Tintic laboratory . A total of 6 , 843 drill core samples, RC chip samples, and QA/QC samples were assayed in 2022 at ALS . The 2022 QA/QC program included a routine insertion of standards and blanks . TCM included one standard in every 20 samples and one blank in every 30 samples . A total of 5 , 141 drill core samples, RC chip samples, and QA/QC samples were assayed in 2023 at SGS . The 2023 QA/QC program included a routine insertion of standards and blanks . TCM included one standard in every 20 samples and one blank in every 40 samples . A total of 4 , 643 chip samples and QA/QC samples were assayed in 2022 at the Tintic laboratory . The 2022 QA/QC program included a routine insertion of standards and blanks . TCM included one standard in every 10 samples and one blank in every 20 samples . 1. Certified Reference Materials (Standards) Accuracy is monitored by adding standards at the rate of one Certified Reference Material (CRM) or Standard for every 20 samples . Standards are used to detect assay problems with specific sample batches and any possible long - term biases in the overall dataset . TCM’s definition of a quality control failure is when :  Assays for a CRM are outside ц three standard deviations ( ц 3 SD) or ц 10 % .  Assays for two consecutive CRMs are outside ц 2 SD, if one of them is outside ц 3 SD . 1. Certified Reference Materials (Standards) at ALS in 2022 A total of 334 standards were analyzed at ALS during the 2022 drilling programs, for an insertion rate of 4 . 9 % . Sixteen different CRMs from Ore Research and Exploration Pty Ltd . (OREAS) were used . OREAS is an independent Australian - based supplier of certified reference materials for the global mining industry since 1988 . OREAS is ISO 17034 accredited . Tintic Project 129 April 25, 2024

Osisko Development Corp. In 2022 , a total of 37 QC failures were recognized and reruns were requested in 19 cases . Reruns were not requested for 18 cases, as per TCM’s protocol, because the surrounding samples assayed at or below the lower detection limit ( 12 cases) or because there was insufficient material for reanalysis ( 6 cases) . Thirteen of these cases did not have sufficient material for initial analysis and were excluded from the table statistics . A total of nine corrected certificates were issued, and the corrected assays were loaded into the database . The 2022 average CRM results are all within ц 2 . 3 % of the expected values (Table 11 . 1 ), except for four CRMs with a limited sample size . Most assays were within ц 3 SD of the accepted value (Figure 11 . 1 ) . Table 11.1 ALS Results of Standards used by TCM for the 2022 Drilling Programs Tintic Project 130 April 25, 2024 Percent of Expected (%) Observed Au (g/t) Expected Au (g/t) Count CRM SD Average SD Average 101.3% 0.012 0.342 0.010 0.338 21 OREAS 217 (Au - AA26) 100.6% N/A 1.790 0.045 1.78 1 OREAS 223 (Au - AA26) 99.0% 0.028 1.188 0.030 1.2 53 OREAS 234 (Au - AA26) 101.7% N/A 1.22 0.030 1.2 1 OREAS 234 (ME - GRA22) 100.6% 0.039 1.861 0.059 1.85 47 OREAS 236 (Au - AA26) 100.6% 0.073 3.571 0.086 3.55 50 OREAS 239 (Au - AA26) 116.6% N/A 4.14 0.086 3.55 1 OREAS 239 (ME - GRA22) 100.6% 0.064 5.545 0.139 5.51 2 OREAS 240 (Au - AA26) 98.9% 0.172 8.573 0.215 8.67 27 OREAS 242 (Au - AA26) 100.5% 0.285 12.452 0.306 12.39 29 OREAS 243 (Au - AA26) 102.1% N/A 12.65 0.306 12.39 1 OREAS 243 (ME - GRA22) 100.4% 1.012 25.833 0.546 25.73 3 OREAS 245 (Au - AA26) 99.9% 0.325 7.650 0.238 7.66 2 OREAS 256 (Au - AA26) 100.5% 0.058 2.202 0.057 2.19 20 OREAS 296 (Au - AA26) 101.0% 0.545 18.000 0.396 17.83 4 OREAS 297 (Au - AA26) 99.8% N/A 17.8 0.396 17.83 1 OREAS 297 (ME - GRA22) 101.0% 1.449 35.327 0.832 34.99 15 OREAS 298 (Au - AA26) 132.3% N/A 46.3 0.832 34.99 1 OREAS 298 (ME - GRA22) 95.3% N/A 85.700 2.232 89.97 1 OREAS 299 (Au - AA26) 102.3% 0.761 5.083 0.260 4.97 37 OREAS 609b (Au - AA26) 105.4% N/A 5.24 0.260 4.97 1 OREAS 609b (ME - GRA22) 100.4% 0.589 9.873 0.254 9.83 3 OREAS 610 (Au - AA26) 100.58% Weighted Average 315 Total Table provided by Osisko Development.

Osisko Development Corp. Figure 11.1 Example of ALS Results for Standard OREAS 234 for the 2022 Drill Programs Figure provided by Osisko Development. 11.5.1.2 Certified Reference Materials (Standards) at SGS in 2023 A total of 291 standards were analyzed at SGS during the 2022 drilling programs, for an insertion rate of 5 . 7 % . Nine different CRMs from OREAS were used . In 2023 , a total of 19 QC failures were recognized, and reruns were requested in 11 cases . Reruns were not requested for the other eight cases, as per TCM’s protocol, because the surrounding samples assayed at or below the lower detection limit ( 0 . 01 g/t Au) . A total of seven corrected certificates were issued, and the corrected assays were loaded into the database . The 2023 average CRM results are all within ц 2 . 2 % of the expected values (Table 11 . 2 ), except for one CRM with a limited sample size . Most assays were within ц 3 SD of the accepted value (Figure 11 . 2 ) . Table 11.2 SGS Results of Standards used by TCM for the 2023 Drilling Programs Percent of Expected (%) Observed Au (g/t) Expected Au (g/t) Count CRM SD Average SD Average 98.7% 0.036 1.184 0.030 1.20 66 OREAS 234 99.0% 0.071 1.831 0.059 1.85 22 OREAS 236 99.0% 0.143 3.513 0.086 3.55 22 OREAS 239 98.7% 0.331 8.561 0.215 8.67 26 OREAS 242 101.4% 0.310 12.568 0.306 12.39 86 OREAS 243 98.4% N/A 25.330 0.546 25.73 1 OREAS 245 101.9% 0.170 18.170 0.396 17.83 2 OREAS 297 Tintic Project 131 April 25, 2024

Osisko Development Corp. Percent of Expected (%) Observed Au (g/t) Expected Au (g/t) Count CRM SD Average SD Average 102.7% 0.042 35.940 0.832 34.99 2 OREAS 298 102.2% 0.357 5.078 0.269 4.97 64 OREAS 609b 100.36% Weighted Average 291 Total Table provided by Osisko Development. Figure 11.2 Example of SGS Results for Standard OREAS 234 for the 2023 Drill Programs Figure provided by Osisko Development. 11.5.1.3 Certified Reference Materials (Standards) at the Tintic Laboratory A total of 538 standards were analyzed at the Tintic laboratory for the 2022 and 2023 chip sampling programs, for an insertion rate of 11 . 6 % . Ten different CRMs from OREAS were used . In 2022 and 2023 , a total of 75 QC failures were recognized and reruns were requested in 67 cases . All failures and reruns were reviewed and approved by the geology department and the corrected assays were loaded into the database . The 2022 and 2023 average CRM results are all within ц 2 . 9 % of the expected values (Table 11 . 3 ), except for one CRM which should have excluded because its gold value was too close to the detection limit . Most assays were within ц 3 SD of the accepted value (Figure 11 . 3 ) . Tintic Project 132 April 25, 2024

Osisko Development Corp. Table 11.3 Tintic Lab Results of Standards used by TCM for the 2022 and 2023 Chip Sampling Programs Percent of Expected (%) Observed Au (g/t) Expected Au (g/t) Count CRM SD Average SD Average 118.4% 0.159 0.400 0.010 0.338 3 OREAS 217 101.6% N/A 1.808 0.045 1.78 1 OREAS 223 98.0% 0.186 5.397 0.139 5.51 26 OREAS 240 97.2% 0.541 25.005 0.546 25.73 31 OREAS 245 99.9% 0.165 7.655 0.238 7.66 40 OREAS 256 102.1% 0.289 2.236 0.057 2.19 45 OREAS 296 98.0% 0.459 17.482 0.396 17.83 156 OREAS 297 98.4% 1.501 34.437 0.832 34.99 172 OREAS 298 97.1% 5.093 87.344 2.232 89.97 34 OREAS 299 97.1% 0.398 9.548 0.254 9.83 30 OREAS 610 98.60% Weighted Average 538 Total Table provided by Osisko Development. Figure 11.3 Example of Tintic Lab Results for Standard OREAS 298 for the 2022 and 2023 Chip Sampling Programs Figure provided by Osisko Development. A representative portion of the data from the 2022 average CRM results for the Tintic laboratory were reviewed by the QPs during the 2022 site visit and were deemed adequate. 11.5.2 Blank Samples Contamination during preparation is monitored by the routine insertion of coarse barren material (a “blank”), that goes through the same sample preparation and analytical procedures as the samples. Tintic Project 133 April 25, 2024

Osisko Development Corp. Elevated values for blanks may indicate sources of contamination in the fire assay procedure (contaminated reagents or crucibles) or sample solution carry - over during instrumental finish . 11.5.2.1 Blank Samples Performance at ALS In 2022 , 240 blanks were submitted to ALS with the drilling and QA/QC samples, for an insertion rate of 3 . 5 % . TCM personnel identified 18 cases of contamination for gold in coarse blank material . In all cases, there was insufficient blank material to re - assay the blanks from crush material . High grade samples preceded the blanks and carryover during the crushing process was likely exaggerated by the low weight of the blanks . All the blanks analyzed at ALS by Au - AA 26 , except for 12 failures, assayed less than or equal to 0 . 1 g/t Au, which is 10 times the detection limit of 0 . 01 g/t Au, and are thus considered acceptable . Table 11 . 4 summarizes the performance of the blanks . Figure 11 . 4 shows the results graphically . Table 11.4 ALS Au - AA26 Results of Blanks used by TCM for the 2022 Drilling Programs 229 Total blanks <0.01 Minimum Au g/t 4.99 Maximum Au g/t 108 (47.1%) Below detection limit (# and %) 12 (5.2%) QC Failures (# and %) Table provided by Osisko Development. Figure 11.4 ALS Results of Blanks for the 2022 Drilling Programs Figure provided by Osisko Development. Tintic Project 134 April 25, 2024

Osisko Development Corp. All the blanks analyzed at ALS by ME - GRA 22 , except for 6 failures, assayed less than or equal to 0 . 5 g/t Au, which is 10 times the detection limit of 0 . 05 g/t Au, and are thus considered acceptable . Table 11 . 4 5 summarizes the performance of the blanks . Figure 11 . 5 shows the results graphically . Table 11.5 ALS ME - GRA22 Results of Blanks used by TCM for the 2022 Drilling Programs 11 Total blanks <0.05 Minimum Au g/t 12.05 Maximum Au g/t 2 (18.2%) Below detection limit (# and %) 6 (54.5%) QC Failures (# and %) Table provided by Osisko Development. Figure 11.5 ALS ME - GRA22 Results of Blanks for the 2022 Drilling Programs Figure provided by Osisko Development. 11.5.2.2 Blank Samples Performance at the SGS Laboratory In 2023 , 152 blanks were submitted to SGS with the drilling samples, for an insertion rate of 3 . 0 % . All the blanks analyzed at SGS assayed less than or equal to 0 . 1 g/t Au, which is 10 times the detection limit of 0 . 01 g/t Au . These results are thus considered acceptable . Table 11 . 6 summarizes the performance of the blanks . Figure 11 . 6 shows the results graphically . Tintic Project 135 April 25, 2024

Osisko Development Corp. Table 11.6 SGS Results of Blanks used by TCM for the 2023 Drilling Programs 66 Total blanks <0.01 Minimum Au g/t 0.1 Maximum Au g/t 143 (94.1%) Below detection limit (# and %) 0 (0.00%) QC Failures (# and %) Table provided by Osisko Development. Figure 11.6 SGS Results of Blanks for the 2023 Drilling Programs Figure provided by Osisko Development. 11.5.2.3 Blank Samples Performance at the Tintic Laboratory In 2022 and 2023 , 193 blanks were submitted to the Tintic Lab with the chip samples, for an insertion rate of 4 . 2 % . All the blanks analyzed at the Tintic Lab assayed less than or equal to 1 . 7 g/t Au, which is 10 times the detection limit of 0 . 17 g/t Au and are thus considered acceptable . Table 11 . 7 summarizes the performance of the blanks . Figure 11 . 7 shows the results graphically . Table 11.7 Tintic Lab Results of Blanks used by TCM for the 2022 and 2023 Chip Sampling Programs 193 Total blanks <0.17 Minimum Au g/t 1.03 Maximum Au g/t 189 (97.9%) Below detection limit (# and %) 0 (0.00%) QC Failures (# and %) Tintic Project 136 April 25, 2024

Osisko Development Corp. Table provided by Osisko Development. Figure 11.7 Tintic Lab Results of Blanks for the 2022 and 2023 Chip Sampling Programs Figure provided by Osisko Development. 3. Tintic Laboratory Sample Preparation Quality Assurance Measures Tintic laboratory sample preparation quality assurance measures include dust collection, compressed air blowdown of each piece of equipment and quartz rock “wash” between each sample . Also, daily a random selection (approximately 10 % ) of pulverized samples are sieve tested to evaluate grinding performance, expecting them to achieve 70 % passing through a 0 . 074 mm screen . 4. Tintic Laboratory Sample Analyses Quality Assurance Measures Equipment used for measurements in the Tintic laboratory is monitored daily for accuracy . Each batch of samples that passes through fire assay contains the certified standard/blank submitted from the geologist and will also include an internal standard and blank . The standard used at the Tintic laboratory is identified as a matrix matched standard (MMS) . The matrix matched standard is a randomly selected sample mixed with an aliquot of a known certified standard . This standard value is calculated by comparing the unmixed sample data with the MMS standard data . If the MMS standard fails, the sample batch is rejected and the assay procedure is repeated from the pulverized sample packets . The completed assay is evaluated against internal quality control of the MMS passing and the blank being below the Tintic laboratory lower detection limit of 0 . 17 g/t ( 0 . 005 opt) for gold . If either standard fails, the analysis is performed again from the sample packets . Once data are reported to the geology department, they will evaluate the submitted standard/blank for compliance . Tintic Project 137 April 25, 2024

Osisko Development Corp. The standard operating procedures applied at the Tintic laboratory for sample preparation, fire assay, fusion and cupellation, parting, weigh back, sample submission, sample reporting, and quality control are in line with industry standards at other production laboratories . These procedures are regularly checked for accuracy by client departments including geology and metallurgy . 11.6 QP C OMMENTS Micon’s QP has reviewed and had extensive discussions with Osisko Development personnel regarding the QA/QC program at the Tintic Project and has reviewed the results of the Tintic laboratory audit by Qualitica Consulting . Micon’s QP also toured the Tintic laboratory during the September, 2022 site visit . During the discussions, all aspects of the QA/QC program, results and recommendations of the Tintic laboratory audit as well as potential additions to the QA/QC programs were discussed . Further discussions were held during the 2024 site visit and during subsequent meetings . Based on the 2022 and 2023 QA/QC results from the various laboratories and the favourable audit of the Tintic laboratory, it continues to be the opinion of Micon’s QP that the assay database for the Trixie deposit is of suitable quality to be used in the estimate of resources and as the basis for further work . Tintic Project 138 April 25, 2024

Osisko Development Corp. 1. DATA VERIFICATION 2. G ENERAL In order to undertake the review and validation of the mineral resource estimate for the Trixie deposit, the QPs of this Technical Report held a number of discussions and meetings with Osisko Development’s personnel and contractors to discuss details relevant to the exploration programs, QA/QC programs, parameters used for the mineral resource estimate and the mineral resource estimate itself . The discussions were held via email chains and phone calls, and Microsoft Teams meetings, as well as during the site visit . At all times, the discussions were open, frank and at no time was information withheld or not available to the QPs . Open and frank discussions continued throughout mineral resource validation from January, 2024 to March, 2024 on all aspects of the process, and this culminated in the completion of the mineral resource estimate and the publication of this report . The MRE was completed by Osisko Development’s chief resource geologist, Daniel Downton, P . Geo . , using Datamine Studio RM Pro 1 . 12 software . The MRE was then reviewed and validated by William Lewis, P . Geo . and Alan San Martin, AusIMM(CP) of Micon . For the purpose of disclosure in this Technical Report, William Lewis, P . Geo . , who is independent of Osisko Development and is a Qualified Person within the meaning of NI 43 - 101 , is responsible for the updated mineral resource estimate, by virtue of his independent review and validation of the work conducted by Osisko Development . The QPs responsible for the preparation of this report and their areas of responsibility and sites visits have been documented previously in Table 2 . 1 . 2. 2022 S ITE V ISIT A site visit was conducted from September 12 to September 16 , 2022 . The site visit was undertaken by Mr . Lewis, in order to independently verify the geology, mineralogy, drilling programs and the QA/QC programs . A number of underground reject face samples were selected by the QP during the site visit, as check samples for independent assaying . Prior to the site visit, the objectives of that site visit were discussed between Osisko Development’s Vice President of Exploration, Maggie Layman, P . Geo . and William Lewis . Mr . Lewis visited the different areas of the property, with an emphasis on verifying the exploration/evaluation works completed to date, as well as obtaining a general overview of the current work at the Trixie test mine and conducting an inspection of the underground workings at the Trixie deposit, along with a visit to the surface drilling site . During the site visit, Mr . Lewis was accompanied by Ms . Layman and had the opportunity to meet the personnel responsible for the various areas of technical services (mining, metallurgy and process), exploration and underground geology as well as a number of contractors . Open and frank discussions were held regarding the exploration programs, sampling QA/QC procedures, mineral resource modelling and the parameters and procedures for the mineral resource estimate . Figure 12 . 1 is a photograph of the Trixie headframe showing the cage used to access underground via the shaft . Tintic Project 139 April 25, 2024

Osisko Development Corp. Figure 12.1 Trixie Headframe showing the Cage to Access Underground Photograph taken during the 2022 Micon Site Visit. 12.2.1 QP Check Sampling, 2022 Site Visit A total of 29 underground reject face chip samples were selected for secondary assaying during the 2022 site visit with the results summarized in Table 12 . 1 . As expected where nuggety gold is involved, some of the lower grade and the higher - grade samples tend to show a poor reproducibility of assays . Of the 29 face chip samples selected by the QP for re - assay, 25 samples returned a similar or a higher gold grade than the original gold assay . Of the 4 samples that returneda lower gold assay, only one was significantly lower . While total reproducibility of the gold assays is not achievable at the Trixie deposit, the check assays clearly demonstrated the presence of potentially economic gold mineralization within the deposit . The silver assays of the 29 check samples showed generally similar results to the gold assays . In the case of silver, there were 8 samples ( 1 significantly) in which the check assay was lower than the original assay . For the other 21 samples the check sample assayed higher for silver . Thus, there is limited reproducibility of both gold and silver assays and this needs to be carefully considered when conducting and validating a mineral resource estimate . Tintic Project 140 April 25, 2024

Osisko Development Corp. Table 12.1 Underground Reject Face Chip Samples Selected for Secondary Assaying during the 2022 Site Visit Tintic Project 141 April 25, 2024 Comparison Original Versus Check Samples Secondary Check Mine Face Chip Sample Results Original Mine Face Chip Sample Results Sample Length Sample Date Sample ID Sample Site ID Ag (%) Au (%) Ag (ounces/ton) Au (ounces/ton) Ag (ppm/grams per ton) Au (ppm/grams per ton) Ag (ounces/ton) Au (ounces/ton) Ag (ppm/grams per ton) Au (ppm/grams per ton) Length (ft) Depth_To (ft) Depth_From (ft) 94.70 118.62 22.93 64.02 788 2,200 21.71 75.94 746.22 2,609.65 2.0 3.5 1.5 2022 - 01 - 01 F73802 738 0.02 11.50 0.73 0.44 25 14.95 0.00 0.05 0.01 1.72 2.4 2.4 0.0 2022 - 01 - 10 F75001 750 92.27 107.31 17.98 9.60 618 330 16.59 10.30 570.24 354.13 1.2 10.4 9.2 2022 - 01 - 13 B75309 753 0.06 0.10 0.23 0.14 8 4.92 0.00 0.00 0.01 0.01 2.0 97.0 95.0 2022 - 01 - 18 R76303 763 0.05 574.30 0.29 0.09 10 3.11 0.00 0.52 0.01 17.86 2.0 99.0 97.0 2022 - 01 - 18 R76404 764 117.99 87.74 8.47 0.27 291 9.41 9.99 0.24 343.34 8.26 1.5 9.4 7.9 2022 - 01 - 23 F77306 773 96.98 91.39 1.51 1.29 52 44.3 1.47 1.18 50.43 40.49 1.5 1.5 0.0 2022 - 01 - 30 F78201 782 90.60 60.18 115.52 55.29 3,970 1,900 104.66 33.27 3,596.74 1,143.35 2.0 2.8 0.8 2022 - 02 - 07 F78702 787 85.59 87.27 27.18 21.15 934 727 23.26 18.46 799.42 634.42 2.0 6.0 4.0 2022 - 02 - 09 R79203 792 105.38 36.73 2.07 0.16 71 5.41 2.18 0.06 74.82 1.99 2.2 4.7 2.5 2022 - 02 - 12 F79402 794 26.40 15.64 0.29 0.08 10 2.63 0.08 0.01 2.64 0.41 2.5 2.5 0.0 2022 - 02 - 23 F80701 807 80.24 76.24 89.62 21.65 3080 744 71.92 16.51 2,471.51 567.26 1.0 1.6 0.6 2022 - 04 - 22 F87802 878 97.87 116.68 130.65 134.44 4,490 4,620 127.87 156.86 4,394.48 5,390.78 2.3 3.3 1.0 2022 - 05 - 05 F89602 896 98.61 148.83 34.05 290.99 1,170 >10000 33.57 433.08 1,153.72 14,883.20 1.0 2.8 1.8 2022 - 05 - 14 F91302 913 14.22 5.59 0.38 1.34 13 45.9 0.05 0.07 1.85 2.57 2.0 2.0 0.0 2022 - 05 - 15 R91501 915 18,734.15 27.71 1.72 0.74 59 25.3 321.63 0.20 11,053.15 7.01 2.0 18.0 16.0 2022 - 05 - 15 R91609 916 144.84 20.78 5.59 4.99 192 171.5 8.09 1.04 278.09 35.63 1.6 2.6 1.0 2022 - 05 - 29 F94802 948 101.65 93.36 23.60 3.55 811 122 23.99 3.31 824.38 113.90 0.9 3.1 2.2 2022 - 07 - 02 F101402 1014 93.42 26.33 0.23 0.17 8 5.99 0.22 0.05 7.47 1.58 1.4 2.7 1.3 2022 - 07 - 04 F101703 1017 67.19 0.89 0.15 0.23 5 7.74 0.10 0.00 3.36 0.07 1.8 7.0 5.2 2022 - 07 - 16 F103805 1038 89.39 99.59 12.69 31.43 436 1,080 11.34 31.30 389.75 1,075.52 1.0 1.0 0.0 2022 - 07 - 23 F106601 1066 89.24 63.89 8.29 14.49 285 498 7.40 9.26 254.34 318.19 1.0 3.0 2.0 2022 - 07 - 24 F106802 1068 81.00 92.02 19.00 150.44 653 5,170 15.39 138.43 528.90 4,757.42 4.0 4.0 0.0 2022 - 08 - 16 F111001 1110 110.95 114.46 59.36 73.04 2,040 2,510 65.86 83.60 2,263.41 2,873.05 2.7 2.7 0.0 2022 - 08 - 17 F111401 1114 47.39 8.85 0.35 0.47 12 16.25 0.17 0.04 5.69 1.44 1.5 7.5 6.0 2022 - 08 - 20 R112003 1120 116.69 0.01 1.16 1.22 40 41.9 1.36 0.00 46.68 0.01 1.2 5.2 4.0 2022 - 08 - 28 F114502 1145 134.61 2.42 0.44 0.91 15 31.2 0.59 0.02 20.19 0.75 1.6 4.4 2.8 2022 - 09 - 03 F116003 1160 112.21 100.54 173.72 150.44 5,970 5,170 194.93 151.25 6,698.97 5,197.77 2.0 2.0 0.0 2022 - 09 - 03 G116301 1163 77.19 89.37 1.95 22.20 67 763 1.50 19.84 51.71 681.89 1.6 2.8 1.2 2022 - 09 - 07 F117602 1176 1.8 Average Reject Face Chip Samples selected for secondary sampling. No UG drilling samples available. 1 ppm = 1 gram/ton. Troy ounces = ppm/34.366.

Osisko Development Corp. The variability in the gold and silver grades is considered to be due to the presence of native gold and silver or to the mineralogy of the samples . Both historical work and recent work indicate that care must be taken when reporting and relying on specific assay grades . Further work is needed to identify the specific minerals, mineral combinations or geological conditions that affect the reproducibility of the sample grades . Further investigation of high - grade assays also needs to be undertaken, by conducting screen metallic assays to determine the percentage of fine to course grained gold and silver contained in the higher - grade samples . 12.3 2024 S ITE V ISIT A site visit was conducted from February 5 to February 8 , 2024 . The site visit was again undertaken by Mr . Lewis, in order to independently verify the exploration, drilling and the QA/QC programs undertaken since the previous site visit was conducted in September, 2022 . During the 2022 site visit a number of underground reject face samples were selected by the QP as check samples for independent assaying . Since the 2022 site visit check sampling confirmed the nature and tenure of the mineralization at the Trixie Test mine, no further check samples were taken during the 2024 site visit . Prior to the 2023 site visit, the objectives of that site visit were discussed between Osisko Development’s Vice President of Exploration, Maggie Layman, P . Geo . and William Lewis . Mr . Lewis visited the different areas of the property, with an emphasis on verifying the underground exploration/evaluation works completed since the 2022 site visit . The underground site visit included a visit to the drill, a number of mineralized headings where the various zones were exposed, an exploration cross - cut and the investors stope . During the site visit, Mr . Lewis was accompanied by Ms . Layman and had the opportunity to meet the personnel responsible for the various areas of technical services (geology, mining, metallurgy and process), as well as a number of underground drilling contractors . A visit was conducted to the core facility to review a number of the drill holes that were completed since the initial site visit was conducted . Open and frank discussions were held regarding the exploration programs, sampling QA/QC procedures, mineral resource modelling and the parameters and procedures for the mineral resource estimate . During the February, 2024 site visit the underground workings were accessed via the completed decline, which had been in progress during the previous site visit in September, 2022 and was completed during 2023 . The decline allows for improved access to the Trixie Test mine and provides secondary access to the workings . Figure 12 . 2 shows the drill setup on CHQ 1683 which was the first stop on the decline going into the Trixie Test mine while on the site visit . The drilling was in progress at the time but had not yet reached the mineralization . Figure 12 . 3 is a view of the 45 Fault Zone . This partly mineralized fault zone was unknown at the time of the 2022 site visit and has been incorporated into the mineral resource estimate for the first time, as a separate mineralized zone for the current resource estimate . Figure 12 . 4 is a view of Exploration Cross - Cut 3 which was one of the cross - cuts driven across the mineralized zones in 2023 to define the nature and extent of the mineralization across the mineralized zones previously defined by drilling and mining . 142 Tintic Project April 25, 2024

Osisko Development Corp. Figure 12.5 is a view of the entrance to the underground decline upon returning at the end of the underground portion of the site visit. Figure 12.2 Underground Drill Setup on Drill Hole CHQ 1683 Photograph taken during 2024 Micon QP Site Visit. Figure 12.3 Mineralized 45 Fault Zone Photograph taken during 2024 Micon QP Site Visit. 143 Tintic Project April 25, 2024

Osisko Development Corp. Figure 12.4 Exploration Cross - Cut 3 Photograph taken during 2024 Micon QP Site Visit. Figure 12.5 Returning to Surface the Underground Decline Photograph taken during 2024 Micon QP Site Visit. 144 Tintic Project April 25, 2024

Osisko Development Corp. 12.4 QP C OMMENTS The presence of grade variability is not a hindrance to producing a reliable resource estimate for a mineral deposit . The first step is to recognize the variability and then to apply appropriate procedures and methodologies to minimize any over estimation of the resource grade . Micon’s QP believes that despite the demonstrated grade variability within the Trixie deposit, Osisko Development has used appropriate procedures within its estimation methodology to limit over estimation of the grade and consequently skewing the metal content within the deposit . While the poor reproducibility of assays clearly indicates the variability of the grade within the mineral zones that comprise the Trixie deposit, Micon’s QPs believe that the database generated for the Trixie deposit is adequate for use as the basis of a mineral resource estimate . The database is also sufficiently reliable to be used as the basis for further work and upon which to conduct further economic studies . 145 Tintic Project April 25, 2024

Osisko Development Corp. 1. MINERAL PROCESSING AND METALLURGICAL TESTING 2. M INERAL P ROCESSING AND M ETALLURGICAL T ESTING This section summarizes the results of metallurgical bench and pilot scale testing on samples obtained from the Trixie test mine . Estimates of precious metal recoveries and reagent consumptions are included . The metallurgical testing was undertaken by Kappes, Cassiday & Associates (KCA), Reno, Nevada for TCM . The Qualified Person (QP) for this section of the report is Richard Gowans, P . Eng . , Principal Metallurgist of Micon . The QP was not involved with the selection of the metallurgical samples or the management of work completed by KCA . In preparing this section of the report, the QP has reviewed the following metallurgical test reports :  Kappes, Cassiday & Associates, Trixie Project, T 2 Soil Sample, Report of Metallurgical Test Work Prepared for Tintic Consolidated Metals LLC, July, 2022 .  Kappes, Cassiday & Associates, Trixie Project, T 4 Soil Sample, Report of Metallurgical Test Work Prepared for Tintic Consolidated Metals LLC, October, 2022 . 2. S AMPLE P ROVENANCE Two bulk metallurgical composite samples were selected and prepared by Osisko Development from mineralization obtained during the exploratory test mining performed in 2021 and early 2022 . The first bulk composite was prepared using laboratory high grade coarse reject samples over an 8 - month period from April to December, 2021 . This sample was titled “T 2 Soil Sample” although it contained both T 2 and T 4 type mineralization . This 477 . 5 kg sample was reported by Osisko Development to be representative of a T 2 /T 4 high grade run - of - mine (ROM) material leached in the TCM pilot vat leach facility (VLF) during 2021 and 2022 . The second composite sample was prepared using four sample increments at various mine accessible points of the T 4 structure . This 171 kg sample was labelled “T 4 Soil Sample” and is roughly representative of the bulk T 4 structure at the 625 level . The QP considers that the composite samples are reasonably representative of the T 2 and T 4 structure mineralization that occurs in the area of interest . 3. M ETALLURGICAL T ESTING The metallurgical testing program using the two composite samples included the following primary testwork :  Multi - element analysis of the samples.  Diagnostic leaching.  Gold deportment mineralogy (AMTEL). 146 Tintic Project April 25, 2024

Osisko Development Corp.  Bulk mineralogy (FLSmidth).  Bottle roll leach testing at various particle sizes.  Gravity separations tests.  Comminution testwork (Hazen Research). The gravity separation amenability tests were not performed for the T 4 sample . 13.3.1 Metallurgical Sample Characterization Average gold and silver analyses for the two composite samples are included in Table 13 . 1 . There was very little variation between the duplicate gold fire assays for the T 2 sample ( 63 . 3 g/t and 64 . 8 - g/t) . The T 4 samples, on the other hand, showed more variation between the duplicate gold head assays ( 6 . 2 g/t and 11 . 3 g/t) . Table 13.1 Metallurgical Composite Sample Average Head Gold and Silver Analyses 147 Tintic Project April 25, 2024 Average Head Assays Sample Description Ag (g/t) Au (g/t) 101.52 64.06 88643 A - T2 Soil Sample 14.49 8.75 88665 A - T4 Soil Sample Multi - element analyses of the two composite head samples are presented in Table 13 . 2 and the whole rock analysis in Table 13 . 3 . These tables present the results for two replicate samples of T 2 , but only a single sample of T 4 . Table 13.2 Metallurgical Composite Selected Multi - Element Analyses T4 Sample T2 Sample B T2 Sample A Units Element/Compound 29 179 173 mg/kg As 54 165 164 mg/kg Bi 0.19 0.08 0.1 % C (total) 0.16 0.07 0.09 % C (organic) 0.04 0.01 0.01 % C (inorganic) <1 3 2 mg/kg Cd 2 4 3 mg/kg Co 214 173 116 mg/kg Cr 74 731 745 mg/kg Cu (total) 45 341 390 mg/kg Cu (cyanide soluble) 1 0.4 0.62 0.64 % Fe 2.25 2.86 2.88 mg/kg Hg 7.5 6 6 mg/kg Mo 12 12 6 mg/kg Ni 120 538 535 mg/kg Pb 0.24 0.52 0.53 % S (total) 0.03 0.14 0.17 % S (sulphide)

Osisko Development Corp. T4 Sample T2 Sample B T2 Sample A Units Element/Compound 0.21 0.38 0.36 % S (sulphate) 38 141 132 mg/kg Sb <5 5 5 mg/kg Se 143 220 228 mg/kg Sr 24 187 179 mg/kg Te 6 8 8 mg/kg V 18 <10 <10 mg/kg W 12 104 92 mg/kg Zn 148 Tintic Project April 25, 2024 1 Average assay from cyanide shake tests. Table 13.3 Metallurgical Composite Whole Rock Analyses T4 Sample (%) T2 Sample B (%) T2 Sample A (%) Compound 96.35 92.07 95.07 SiO 2 0.77 1.54 1.57 Al 2 O 3 0.65 0.92 0.85 Fe 2 O 3 0.37 0.43 0.46 CaO 0.08 0.05 0.07 MgO 0.11 0.04 0.05 Na 2 O 0.20 0.27 0.27 K 2 O 0.13 0.15 0.16 TiO 2 0.01 0.03 0.03 MnO 0.02 0.03 0.03 SrO 0.79 1.32 1.27 BaO 0.05 0.04 0.03 Cr 2 O 3 0.02 0.01 0.01 P 2 O 5 1.25 1.86 1.83 LOI1090 Σ C 100.76 98.76 101.70 SUM Both samples are characterized by high silica content ( 92 % to 96 % ) and low sulphide sulphur content, typically less than 0 . 2 % . Copper in the T 2 sample measured about 750 g/t but only about half of this is readily cyanide soluble . Deleterious elements often encountered in gold mineral resources are present in low concentrations in both samples . Mercury is < 3 ppm, selenium was analyzed at or below 5 ppm, and arsenic, on average, was 176 g/t for T 2 and 29 g/t for the T 4 sample . The T 2 , high grade structure sample did show relatively higher concentrations of these deleterious elements than the T 4 material . As noted above, the sulphide sulphur content was relatively low and, therefore, it is unlikely that either sample will be acid generating .

Osisko Development Corp. 2. Mineralogy 1. Sample Mineralogy Samples of pulverized T 2 and T 4 composites were submitted to FLSmidth Inc . in Midvale, Utah, for QEMSCAN analyses, which show the global mineralogy of the samples . A summary of these results, showing the 12 most abundant mineral phases, is presented in Table 13 . 4 . Table 13.4 Summary of QEMSCAN Results 149 Tintic Project April 25, 2024 Composite T4 Composite T2 Relative Abundance (%) Mineral Relative Abundance (%) Mineral 94.968 Quartz 93.611 Quartz 1.693 Pyrophyllite 2.025 Barite 1.403 Barite 1.147 Smectite/Kaolinite 0.723 Smectite/Kaolinite 1.013 Pyrophyllite 0.562 Carbonates 0.538 Carbonates 0.219 Other 0.431 Pyrite 0.086 Svanbergite 0.401 Tramp iron 0.076 Tramp iron 0.188 Other 0.069 Iron oxide 0.169 Svanbergite 0.064 Pyrite 0.134 Diaspore 0.055 Rutile/Ilmenite 0.056 Rutile/Ilmenite 0.036 Zircon 0.055 Zircon The main component of the two samples is quartz ( 94 - 96 % ) and both contain minor barite, pyrophyllite, smectite/kaolinite clays, and carbonates . The T 2 sample contains a little more pyrite than the T 4 sample ( 0 . 4 % vs 0 . 06 % ) . 13.3.2.2 Precious Metals Deportment KCA completed a diagnostic leach test for gold and silver deportment of the samples . This procedure identifies the mineral associations via wet - chemical analytical methods for gold and silver and provides an indication of potential methods for their extraction . The T 2 sample contained almost entirely ( 98 . 8 % ) directly cyanide soluble gold with minor constituents associated with other minerals . Silver was 83 . 3 % cyanide soluble with more significant associations with other minerals . For the T 4 sample, 87 . 5 % of gold was directly cyanide soluble with significant gold associated (about 11 % ) with copper - zinc sulphides and labile pyrite . Silver was 83 . 8 % cyanide soluble in the T 4 sample . The results for the two composite samples ground to 80 % passing 74 microns are shown in Table 13 . 5 .

Osisko Development Corp. Table 13.5 Summary of Diagnostic Leach Test Results 150 Tintic Project April 25, 2024 T4 Sample T2 Sample Mineral Associations Ag Extraction (%) Au Extraction (%) Ag Extraction (%) Au Extraction (%) 83.8 87.5 83.3 98.8 Direct cyanide soluble 2.8 1.1 9.1 0.6 Calcite, dolomite, galena, pyrrhotite, hematite 2.3 11.1 2.6 0.1 Cu - Zn sulphides, labile pyrite 1.0 0.3 0.8 0.4 Sphalerite, galena, labile sulphide, tetrahedrite 2.5 0.0 0.6 0.0 Pyrite, marcasite, arsenopyrite 7.6 0.1 3.6 0.1 Locked in gangue 100.0 100.0 100.0 100.0 Total The diagnostic leach test results are supported by the mineralogical gold deportment studies conducted by AMTEL, London, Ontario, Canada . The AMTEL study using the T 2 sample at a grind size of 80 % passing 150 microns showed that 99 % of gold was exposed and potentially cyanide soluble, with 21 % existing as free gold, 31 % associated with hessite (Ag 2 Te), 36 % associated with other tellurates and 12 % associated with other minerals . The study showed that 41 % of the gold grains present in the sample were > 38 µm and potentially amenable to gravity separation . A similar study for the T 4 material showed that 81 % of the gold was free gold with hessite and telluride associations of 7 % and 10 % , respectively . Compared to T 2 , the T 4 gold was finer with 100 % of T 4 gold passing 75 µ (compared to 76 % for the T 2 sample) and 25 %% of the gold was > 38 µm . 13.3.3 Bottle Roll Leach Tests Bottle roll leach tests were conducted to determine the potential for gold recovery from the two composite samples by direct cyanidation under a range of conditions . The kinetic 72 - hour leach tests investigated grind size, sodium cyanide concentration and dissolved oxygen (DO) . The bottle roll leach test results for sample T 2 are summarized in Table 13 . 6 . These tests explored a range of grind sizes from 80 % passing 1 mm to 75 µm, cyanide concentration range from 0 . 5 - 1 . 5 g/L, and the effect of pre - aeration . Gold and silver extractions increased with finer grind size with 99 % Au and 82 % Ag extraction after 72 hours at a grind of 80 % passing 75 µm and using 1 g/L NaCN concentration . The Au extraction did not improve with pre - aeration or higher cyanide solution concentration levels above 1 g/L, although silver extraction kinetics tended to improve with higher DO and cyanide concentration .

Osisko Development Corp. Table 13.6 Summary of T2 Direct Bottle Roll Leach Test Results 151 Tintic Project April 25, 2024 NaCN Consumption Extraction Calculated Head Pre - aeration Target DO mg/L Target NaCN, g/L Target P 80 Size, mm KCA Test Number kg/t Ag - 72h Au - 72h Ag g/t Au g/t 0.70 58% 89% 159 79.7 - 1.0 1.0 88644A 0.80 62% 94% 159 75.8 - 1.0 0.5 88644B 0.91 78% 98% 146 72.0 - 1.0 0.15 88644C 0.96 82% 99% 153 73.7 - 1.0 0.075 88644D 0.78 62% 98% 149 73.4 - 0.5 0.075 88650A 1.01 87% 99% 142 63.9 - 1.5 0.075 88650B 1.19 86% 99% 123 72.6 8 1.0 0.075 88663A 1.07 88% 99% 156 80.7 >14 1.0 0.075 88663B Bottle roll leach test results for sample T 4 are summarized in Table 13 . 7 . These tests explored a range of grind sizes from 80 % passing 1 mm to 75 µm, cyanide concentration range from 0 . 5 - 4 . 0 g/L, and the effect of pre - aeration . Gold and silver extractions increased with finer grind size although there was no improvement with grinding below 150 µm . Extractions after 72 hours at this grind size were 98 % for Au and 80 % for Ag when using 1 g/L NaCN concentration . The Au extraction tended not to improve with pre - aeration or higher cyanide solution concentration levels above 1 g/L, although silver extraction kinetics tended to improve with higher cyanide concentration but with no increase in DO . Table 13.7 Summary of T4 Direct Bottle Roll Leach Test Results NaCN Consumption Extraction Calculated Head Pre - aeration Target DO mg/L Target NaCN, g/L Target P 80 Size, mm KCA Test Number kg/t Ag - 72h Au - 72h Ag g/t Au g/t 0.13 71% 95% 20.3 8.02 - 1.0 1.0 88672A 0.15 75% 97% 20.2 8.43 - 1.0 0.5 88672B 0.20 80% 98% 20.7 8.07 - 1.0 0.15 88672C 0.42 73% 96% 20.5 8.06 - 1.0 0.075 88673A 0.88 78% 97% 20.9 7.99 - 0.5 0.075 88672D 0.58 82% 98% 21.9 8.59 - 1.5 0.075 88673B 1.34 84% 97% 21.0 7.43 - 3.0 0.075 88677A 1.30 82% 98% 18.1 6.95 - 4.0 0.075 88677B 0.31 80% 98% 16.6 7.69 8 1.5 0.075 88674A 0.29 81% 98% 17.1 7.70 >14 1.5 0.075 88674B 13.3.4 Gravity Separation Tests Gravity separation tests were completed using sample T 2 at four grind sizes, 80 % passing 1 mm, 0 . 5 mm, 0 . 15 mm and 0 . 075 mm . The primary gravity concentration step used a Knelson centrifugal gravity concentrator, the concentrate from which was cleaned using a shaking table . A sample of each test

Osisko Development Corp. gravity tailings was cyanide leach for 72 hours. A summary of the gravity and gravity tailings leach test results is presented in Table 13.8 . Table 13.8 Summary of T2 Gravity and Gravity Tails Leach Test Results 152 Tintic Project April 25, 2024 Total Recovery Gravity Tails Gravity Recovery Gravity Conc. Grade Gravity Conc. Wt% Target P 80 Size, mm Leach Extraction Ag% Au% Ag% Au% Ag% Au% Ag g/t Au g/t 74% 95% 67% 92% 22.2% 35.5% 5,576 5,574 0.4 1.0 75% 98% 73% 97% 8.6% 39.9% 2,075 6,313 0.4 0.5 85% 99% 82% 98% 19.2% 38.6% 3,160 3,808 0.6 0.15 85% 99% 83% 98% 11.5% 33.9% 2,762 4,892 0.4 0.075 Gravity separation testing showed, as expected by the minerology, approximately 40 % gravity gold recoverable and 20 % or less recovery of silver . The combined gravity plus gravity tailings leach recoveries were similar to the direct leach results . 13.3.5 Comminution Tests A portion of as - received head material for the two composite samples, along with a portion of previously screened head material of T 2 only ( - 19 mm + 12 . 5 mm) was submitted to Hazen Research for comminution testing . Testwork was completed to provide a Bond Ball Mill Work index for both samples and an abrasion index for T 2 ( Table 13 . 9 ) . Table 13.9 Summary of Comminution Test Results T4 Composite T2 ( - 19 mm +12.5 mm) T2 Composite Test Description 19.0 18.2 Bond Ball Mill Work Index (kWh/t) 0.6753 Abrasion Index (g) The comminution test results suggest that the T 2 and T 4 composite samples are relatively hard and that the T 2 composite is very abrasive . 13.3.6 Additional Testwork In addition to the metallurgical/mineralogical work outlined above, Osisko Development reports that testwork was completed by Patterson Cooke to determine the dewatering behaviour of leach tailings samples . This program of work included, thickener settling rates, filtration rates, and Proctor compaction tests . Osisko Development also reported that testwork to support engineering of a cyanide destruction system was completed by Forte Dynamics . Osisko Development reports that around 70 to 75 % gold recovery was achieved by the pilot scale operation of the vat leach facility using crushed mineralization . This reported recovery is allegedly supported by regular internal bottle roll test results using crushed and ground vat feed samples over

Osisko Development Corp. one year of test mining, which typically showed about 83 % gold extraction at a top size of 5 mm . Micon was not provided with test reports to verify this work . 13.4 N OTES R EGARDING M ETALLURGICAL L ABORATORY C ERTIFICATIONS All the metallurgical testwork reported in this section was conducted and organized by KCA with some aspects subcontracted to FL Smidth and Amtel . KCA is not ISO accredited . Assays for the testwork undertaken by KCA were carried out by Florin Analytical Services (FAS), part of the KCA group, which operates as an independent commercial analytical laboratory . FAS participates in round robin analyses within several professional organizations, including :  American Society of Testing Material (ASTM) bullion by cupellation Round Robin Program.  Society of Mineral Analysts Proficiency Studies.  Geostats Survey of International Laboratories. 13.5 C ONCLUSIONS AND R ECOMMENDATIONS The composite samples selected by Osisko to represent typical T 2 and T 4 structure mineralization were amenable to agitation cyanide leaching . Scoping level bottle roll leaching tests suggested that very high gold extractions ( 98 - 99 % ) could be achieved under typical design conditions . Corresponding silver extractions of around 80 % to 88 % would be expected . It is recommended that the following program of additional testing be undertaken during the next stage of project development:  Leaching tests to optimize conditions in terms of precious metal recovery, capital costs and operating costs.  Comparative testwork and techno - economic study to compare heap, VAT and agitation leaching technologies.  Geochemical characterization testwork on representative feed and residue samples.  Appropriate additional comminution testing depending on the most likely process flowsheet.  Variability testwork. 153 Tintic Project April 25, 2024

Osisko Development Corp. 1. MINERAL RESOURCE ESTIMATES 2. I NTRODUCTION The Mineral Resource Estimate (the “ 2024 Trixie MRE”) for the Trixie test mine (the “ 2024 Trixie MRE”), was conducted in February and March, 2024 and comprises resources for the Trixie deposit in the East Tintic district . The estimate was prepared, using all available information, by Daniel Downton, P . Geo . , of Osisko Development, and reviewed and validated by William Lewis, P . Geo . , and Alan S J San Martin, AusIMM(CP) of Micon who are independent QPs, as that term is defined in NI 43 - 101 . This section describes the development of the resource estimate, including methods used and key assumptions considered during the estimation process . 2. CIM R ESOURCE D EFINITIONS AND C LASSIFICATIONS All resources and reserves presented in a Technical Report must follow the current CIM Definitions and Standards for mineral resources and reserves or a similar standard, such as the Australasian JORC Code . The latest edition of the CIM Definitions and Standards was adopted by the CIM council on May 10 , 2014 , and includes the following resource definitions : “Mineral Resources are sub - divided, in order of increasing geological confidence, into Inferred, Indicated and Measured categories . An Inferred Mineral Resource has a lower level of confidence than that applied to an Indicated Mineral Resource . An Indicated Mineral Resource has a higher level of confidence than an Inferred Mineral Resource but has a lower level of confidence than a Measured Mineral Resource . ” “A Mineral Resource is a concentration or occurrence of solid material of economic interest in or on the Earth’s crust in such form, grade or quality and quantity that there are reasonable prospects for eventual economic extraction . ” “The location, quantity, grade or quality, continuity and other geological characteristics of a Mineral Resource are known, estimated or interpreted from specific geological evidence and knowledge, including sampling . ” “Material of economic interest refers to diamonds, natural solid inorganic material, or natural solid fossilized organic material including base and precious metals, coal, and industrial minerals . ” “The term Mineral Resource covers mineralization and natural material of intrinsic economic interest which has been identified and estimated through exploration and sampling and within which Mineral Reserves may subsequently be defined by the consideration and application of Modifying Factors . ” “Inferred Mineral Resource” “An Inferred Mineral Resource is that part of a Mineral Resource for which quantity and grade or quality are estimated on the basis of limited geological evidence and sampling . Geological evidence is sufficient to imply but not verify geological and grade or quality continuity . ” 154 Tintic Project April 25, 2024

Osisko Development Corp. “An Inferred Mineral Resource has a lower level of confidence than that applying to an Indicated Mineral Resource and must not be converted to a Mineral Reserve . It is reasonably expected that the majority of Inferred Mineral Resources could be upgraded to Indicated Mineral Resources with continued exploration . ” “An Inferred Mineral Resource is based on limited information and sampling gathered through appropriate sampling techniques from locations such as outcrops, trenches, pits, workings and drill holes . Inferred Mineral Resources must not be included in the economic analysis, production schedules, or estimated mine life in publicly disclosed Pre - Feasibility or Feasibility Studies, or in the Life - of - mine plans and cash flow models of developed mines . Inferred Mineral Resources can only be used in economic studies as provided under NI 43 - 101 . ” “Indicated Mineral Resource” “An Indicated Mineral Resource is that part of a Mineral Resource for which quantity, grade or quality, densities, shape and physical characteristics are estimated with sufficient confidence to allow the application of Modifying Factors in sufficient detail to support mine planning and evaluation of the economic viability of the deposit . ” “Geological evidence is derived from adequately detailed and reliable exploration, sampling and testing and is sufficient to assume geological and grade or quality continuity between points of observation . ” “An Indicated Mineral Resource has a lower level of confidence than that applying to a Measured Mineral Resource and may only be converted to a Probable Mineral Reserve . ” “Mineralization may be classified as an Indicated Mineral Resource by the Qualified Person when the nature, quality, quantity and distribution of data are such as to allow confident interpretation of the geological framework and to reasonably assume the continuity of mineralization . The Qualified Person must recognize the importance of the Indicated Mineral Resource category to the advancement of the feasibility of the project . An Indicated Mineral Resource estimate is of sufficient quality to support a Pre - Feasibility Study which can serve as the basis for major development decisions . ” “Measured Mineral Resource” “A Measured Mineral Resource is that part of a Mineral Resource for which quantity, grade or quality, densities, shape, and physical characteristics are estimated with confidence sufficient to allow the application of Modifying Factors to support detailed mine planning and final evaluation of the economic viability of the deposit . ” “Geological evidence is derived from detailed and reliable exploration, sampling and testing and is sufficient to confirm geological and grade or quality continuity between points of observation . A Measured Mineral Resource has a higher level of confidence than that applying to either an Indicated Mineral Resource or an Inferred Mineral Resource . It may be converted to a Proven Mineral Reserve or to a Probable Mineral Reserve . ” “Mineralization or other natural material of economic interest may be classified as a Measured Mineral Resource by the Qualified Person when the nature, quality, quantity and distribution of data are such that the tonnage and grade or quality of the mineralization can be estimated to within close limits and that variation from the estimate would not significantly affect potential 155 Tintic Project April 25, 2024

Osisko Development Corp. economic viability of the deposit. This category requires a high level of confidence in, and understanding of, the geology and controls of the mineral deposit.” 3. CIM E STIMATION OF M INERAL R ESOURCES B EST P RACTICES G UIDELINES When reviewing and validating Osisko Development’s mineral resource estimate for the Trixie deposit, Micon’s QPs have used the CIM Estimation of Mineral Resources and Mineral Reserves Best Practice Guidelines which were adopted by the CIM Council on November 29 , 2019 . 4. M ETHODOLOGY The 2024 Trixie MRE discussed herein covers the Trixie deposit . The mineral resource area for the deposit covers a strike length of approximately 440 m down to a vertical depth of approximately 340 m below surface . The wireframe models for the Trixie deposit were prepared using LeapFrog GEO v . 2023 . 1 (LeapFrog) . Wireframe modelling included the construction of six mineralized domains constrained to the extents of the regional - scale Tintic Quartzite lithologic unit and capped by shale belonging to the overlying lower member of the Ophir Formation (see Section 7 . 0 ) . Geostatistical analyses were carried out using Datamine Snowden Supervisor v . 8 . 15 . 0 . 3 (Supervisor) . The estimation, block model and grade interpolation, were prepared using Datamine StudioTM RM Pro v . 2 . 0 . 66 . 0 (Datamine) . Resource - level potentially mineable underground shapes were created using Deswik CAD v . 2023 . 2 . 762 Shape Optimizer module (Deswik . SO v . 5 . 0 . 3792 ) . The main steps in the methodology were as follows:  Compile and validate the diamond drill hole, RC drill hole, and chip sample databases used for mineral resource estimation.  Validate the geological model and interpretation of the mineralized domains, based on lithological and structural information, underground mapping, and metal content.  Validate the drill hole and chip sample databases, compositing database and capping values, for the purpose of geostatistical analysis, and perform variography.  Validate the block model and grade interpolation .  Validate the criteria for mineral resource classification .  Assess the mineral resources with “reasonable prospects for eventual economic extraction” by selecting appropriate cut - off grades and producing reasonable “resource - level” optimized underground potentially mineable shapes .  Generate a Mineral Resource Estimate statement .  Assess and identify the factors that could affect the mineral resource estimate. Since the block model is presented in units of measurement used in the USA, short tons needed to be converted to metric tonnes during the evaluation process . The conversion used is 1 . 0 tonne is equal to 1 . 10231 tons or 1 . 0 ton is equal to 0 . 90718 tonnes . 156 Tintic Project April 25, 2024

Osisko Development Corp. 14.5 R ESOURCE D ATABASE The close - out date for the Trixie deposit 2024 Trixie MRE database is February 13 , 2024 . The database consists of 161 validated diamond drill holes, totalling 9 , 305 . 51 m of core and including 8 , 373 sample intervals . The database also includes 22 validated RC drill holes, totalling 3 , 447 . 29 m of RC drilling and including 2 , 430 sample intervals, and 1 , 387 underground chip sample strings comprising 6 , 191 sample intervals assayed for gold (Au) and silver (Ag), ( Figure 14 . 1 ) . The database includes validated location, survey and assay results . It also includes lithological descriptions taken from drill core logs . The database covers the strike length of each mineralized domain at variable drill hole and chip sample spacings, ranging from 1 . 5 to 50 m . In addition to the tables of raw data, each database includes several tables of calculated drill hole composites and wireframe solid intersections, which are required for the statistical evaluation and mineral resource block modelling . Figure 14.1 Plan View (left) and Orthogonal View Looking Northwest (right) of the Trixie Drill Hole and Chip Sample Database Figure supplied by Osisko Development. 14.6 G EOLOGICAL M ODEL Using the data acquired since the previously reported resources dated January 2023 , the Osisko Development geological team prepared updates and improvements to the geological model of the Trixie deposit in LeapFrog, using underground mapping, chip samples, RC drill holes, and validated diamond drill holes, all completed by February 13 , 2024 . 157 Tintic Project April 25, 2024

Osisko Development Corp. A total of 6 mineralized domains were modelled (Figure 14 . 2 ) . Each domain was restricted up dip by its contact with the lower shale member of the Ophir Formation, as this contact acts as an impermeable cap to mineralizing fluids . The current modelled dimensions of the mineralization cover a strike length of 530 m, a maximum width of 105 m, and to a maximum depth of 195 m . A north - south trending, sub - vertically dipping fault structure has been mapped across multiple underground development headings near the 625 level and has been intercepted in multiple drill holes (R 4 Fault) . Though the full extent of the structure is as yet unknown, it is currently inferred to project through the entirety of the model . As underground mapping indicates minor offset of the T 2 structure across this fault, it is used as a hard boundary for geological modelling and grade interpolation . The model is thus split into east and west fault blocks, with each mineralized domain subdivided into respective east and west subdomains . The structurally controlled and historically exploited 75 - 85 domain consists of a discrete steeply west - dipping polymetallic silica - sulphide cemented breccia zone developed within a historically described fissure fault . Current data suggest that the 75 - 85 structure crosscuts and truncates both the T 2 structural and T 4 stockwork domains . A discrete splay mapped at the 625 level was modelled along the hanging wall of the main 75 - 85 structure and is statistically treated as part of the domain . The ~ 530 m strike - length of the domain in the current MRE extends from a northern limit at the southern extents of the historic 756 stope to within ~ 15 - 45 m (~ 50 - 150 ft) of the projected intersection of the structure with the Eureka Lilly Fault . Figure 14.2 Vertical Section View of the Trixie Geological and Resource Domain Wireframes Looking North Figure supplied by Osisko Development. 158 Tintic Project April 25, 2024

Osisko Development Corp. The structurally controlled T 2 domain is a discrete subvertical vein and breccia zone, dipping to the east and characterized by polymetallic gold and silver - rich telluride - bearing mineralization with quartz - barite gangue . The extent of the current T 2 model covers a 485 m (~ 1 , 600 ft) strike length and a down - dip distance of approximately 150 m ( 490 ft) sub - vertical . The T 2 domain is constrained in the footwall of the 75 - 85 domain . The T 3 domain consists of mineralization localized in a discrete steeply east - dipping fissure vein breccia with measurable but limited down - dip and along strike extents, constrained within the hanging wall of the 75 - 85 domain and characterized by polymetallic gold and silver rich mineralization with quartz - barite and sulphide gangue . The extent of the current T 3 model covers a 170 m (~ 555 ft) strike length and a down - dip distance of approximately 40 m ( 130 ft) . The T 4 domain consists of a broad enveloping zone surrounding multiple discrete quartz - barite stockwork and fissure veining structures and structural zones developed around and similar to the discrete T 2 structure and in the foot wall of the 75 - 85 zone . Stockwork veining is often accompanied by tellurides and dark sulphosalt inclusions comprising less than 0 . 5 % of vein mass but typically related to elevated gold grades . Localized elevated gold grades within the T 4 domain are also associated with semi - continuous, smaller - scale T 2 - like fissure veins that are sometimes difficult to trace . Thirteen discrete structure zones were interpreted and modelled within the T 4 to help inform the local anisotropy for its estimation . The T 4 domain is further divided into upper and lower sub - domains separated by the 40 Fault for hard boundary estimation . Limited data have been collected in the area surrounding the T 2 structure in the western fault block and, therefore, the T 4 was not developed for it . The dimensions of the currently modelled T 4 domain extend to the full dimensions of the complete mineralization model except that the strike is constrained to 480 m (~ 1 , 575 ft) in the western fault block . The Wild Cat domain is one of the discrete stockwork zones modelled within the T 4 with a steep to moderate easterly dip . This zone has one of the highest levels of confidence among the geology team in its interpretation and continuity due to the amount of test mining both along strike and in crosscuts . It was deemed reasonable for use in the resource estimate as a constraining structural domain . The extent of the current Wild Cat model cover a 220 m (~ 720 ft) strike length and a down - dip distance of an average 26 m ( 85 ft) . The Wild Cat domain is constrained up dip along the footwall of the 40 Fault . The 40 Fault domain is a fault breccia zone containing gold and silver bearing mineralization and is located crosscutting through the T 4 area . It generally strikes north and dips on average 40 degrees to the east . Underground mapping suggests that the 40 Fault is a hard boundary for the discrete mineralized structures within the T 4 domain . The extent of the current 40 Fault domain covers a 230 m (~ 750 ft) strike length and a down - dip distance of approximately 80 m ( 260 ft), or approximately 55 m ( 180 ft) vertical . The main improvements made between the January, 2023 and the March, 2024 resource domains are the modelling of the discrete 40 fault and Wild Cat domains and the incorporation of the T 1 domain into the T 4 domain . 159 Tintic Project April 25, 2024

Osisko Development Corp. 7. G EOSTATISTICAL A NALYSIS 1. Compositing For each domain, the assay data were flagged and analyzed to determine an appropriate composite length to minimize any bias introduced by variable sample lengths . Most of the analytical samples were collected at lengths of between 0 . 15 and 1 . 83 m . A modal composite length of approximately 1 . 22 m was applied to all domains, generating composites as close to 1 . 22 m as possible, while creating residual intervals with a minimum of 0 . 06 m in length . Composites were derived from raw values within the modelled resource domains . 2. High Grade Capping The impact of high - grade outliers on composite data was examined using log histograms and log probability plots . Cumulative metal and mean and variance plots were analyzed for the impact of high - grade capping . Threshold indicator grades were coded and analyzed to determine spatial continuity of the high grades . The indicator variograms suggest that high - grade continuity decreases with increasing grade thresholds . Upon statistical and spatial review of the composite data, the QPs are of the opinion that capping is required in order to restrict the influence of high - grade outlier assays at varying ranges . Multiple capping (different capping at different ranges in each domain) was selected as the capping methodology for the gold and silver grades at the Trixie deposit . The top capping thresholds were selected based on the probability plots and vary from 50 . 0 g/t to 1 , 600 . 0 g/t Au and 300 . 0 g/t to 2 , 300 . 0 g/t Ag . These top capping grades are summarized in Table 14 . 1 . Table 14.1 Top Capping Grades for Gold and Silver 160 Tintic Project April 25, 2024 Ag Top Capping (g/t) Au Top Capping (g/t) Domain 300.0 50.0 T4 2,300.0 1,600.0 T2 300.0 50.0 T3 300.0 50.0 Wild Cat 300.0 50.0 40 Fault 600.0 90.0 75 - 85 Table supplied by Osisko Development. The maximum range for high - grade continuity was established using the indicator variograms, which suggest a loss of continuity after 3 . 0 m to 9 . 0 m, depending on the mineralized domain . A range of 7 . 6 m was selected and applied to all zones, as a general average search range for the first top capping level . During analysis of the log probability plots, secondary capping thresholds were observed and determined for the multiple capping parameter . The secondary capping was applied to the composites when search ranges exceeded 7 . 6 m . Continuity of the secondary capping was confirmed using

Osisko Development Corp. indicator variograms . The secondary capping values are presented with the other estimation parameters in Table 14 . 5 . Gold and silver statistics for the raw assay data, composites, and capped composites are presented in Table 14 . 2 . As evidenced by the increased Au grade from raw to composite samples in the T 3 domain, high grades have some smearing during compositing . However, this domain has a small volume and sample population, and any smearing is considered immaterial to the final resource estimate . 14.7.3 Density TCM’s density databases contain 512 measurements taken on samples across multiple geologic domains. Table 14.3 provides a breakdown of bulk density measurements of the mineralized domains. Average bulk density values in the mineralized domains were assigned to the T4 (2.618 t/m 3 ), T2 (2.955 t/m 3 ), T3 (2.638 t/m 3 ), Wild Cat and 40 Fault (2.621 t/m 3 ), and 75 - 85 (2.617 t/m 3 ) domains. A density of 0.00 t/m 3 was assigned to the underground voids from all past mining activities. Bulk densities were used to calculate tonnages from the volume estimates in the block model. Table 14.2 Sample Statistics for Gold and Silver for Raw Samples, Capped Composites and Uncapped Composites 161 Tintic Project April 25, 2024 Gold CoV Variance Average Au g/t Maximum Minimum Nsamples Domain 23.69 7,577.55 3.68 6,450.00 0.000 10,392 T4 Raw Data 4.28 789,360.92 207.55 16,381.81 0.003 2,100 T2 7.97 130,703.09 45.34 4,080.00 0.005 130 T3 2.47 496.62 9.01 154.82 0.000 236 Wild Cat 2.63 562.90 9.02 165.50 0.005 180 40 Fault 8.70 57,094.52 27.47 5,197.77 0.003 589 75 - 85 27.97 8,147.76 3.23 6,450.00 0.000 9,279 T4 Composites 3.04 295,392.04 178.85 6,852.95 0.005 1,073 T2 5.85 292,575.00 92.40 4,080.00 0.011 57 T3 1.95 199.16 7.25 81.91 0.020 144 Wild Cat 2.50 356.23 7.54 155.17 0.005 148 40 Fault 9.70 63,399.99 25.97 5,197.77 0.005 449 75 - 85 5.13 22.42 0.92 50.00 0.000 9,279 T4 Capped Composites 2.22 104,495.69 145.51 1,600.00 0.005 1,073 T2 1.68 201.56 8.48 50.00 0.011 57 T3 1.73 134.45 6.69 50.00 0.020 144 Wild Cat 1.77 117.66 6.13 50.00 0.005 148 40 Fault 2.13 410.36 9.53 90.00 0.005 449 75 - 85

Osisko Development Corp. Silver CoV Variance Average Ag g/t Maximum Minimum Nsamples Domain 9.80 20,532.08 14.62 11,053.15 0.000 10,389 T4 Raw Data 4.01 700,743.92 208.60 23,200.00 0.003 2,098 T2 3.01 419,053.56 214.83 6,273.17 0.005 130 T3 3.05 20,054.95 46.37 1,679.54 0.000 236 Wild Cat 1.75 7,620.75 49.90 691.00 0.000 180 40 Fault 3.86 145,153.63 98.74 6,698.97 0.005 589 75 - 85 8.74 10,132.19 11.52 5,542.59 0.000 9,276 T4 Composites 2.79 253,018.21 180.54 8,190.00 0.003 1,070 T2 1.98 167,499.89 206.56 2,090.00 0.005 57 T3 2.27 8,054.75 39.55 847.97 0.000 144 Wild Cat 1.73 5,207.65 41.75 527.11 0.000 148 40 Fault 4.18 142,983.14 90.37 6,698.97 0.005 449 75 - 85 3.58 933.03 8.54 300.00 0.000 9,276 T4 Capped Composites 2.26 140,186.64 165.53 2,300.00 0.003 1,070 T2 0.94 10,988.15 111.37 300.00 0.005 57 T3 1.59 3,001.87 34.40 300.00 0.000 144 Wild Cat 1.55 3,822.47 39.78 300.00 0.000 148 40 Fault 1.74 12,099.59 63.23 600.00 0.005 449 75 - 85 162 Tintic Project April 25, 2024 Table supplied by Osisko Development. Table 14.3 Bulk Density Values Used for the Mineralized Domains of the Trixie Deposit Density (t/m 3 ) Nsamples Domain 2.618 330 T4 2.955 164 T2 2.638 10 T3* 2.621 156 Wild Cat** 2.621 156 40 Fault** 2.617 184 75 - 85*** Table Notes: T4 is made up of the original T1 and T4 areas as designated by the TCM geology team in 2021. * T3 has no direct measurements. CT (western quartzite) and 75 - 85 measurements used as these are the host domains for T3. ** Wild Cat and 40 Fault domains are within the original T4 (East of T2) area. All original T4 measurements are used. *** 75 - 85 has only 2 direct measurements . These 2 and the measurements from the surrounding domains CT (western Quartzite) and T 1 (west of T 2 ) were used . Table supplied by Osisko Development .

Osisko Development Corp. 4. Variogram Analysis The spatial distribution of gold and silver was evaluated through variogram analysis for each mineralized domain . Spherical variograms were modelled for each domain . All variogram analyses and modelling were performed in “Supervisor” . Primary directions and orientations of the variograms were observed in the data and visually in 3 D space . These orientations were then examined statistically within the software package to ensure that they represented the best possible fit of the geology and grade continuity . Table 14 . 4 summarizes the modelled variograms and Figure 14 . 3 provides an example of the variogram models used in the mineral resource estimation for the T 2 domain . 5. Search Ellipse Parameters For all domains, the 3 D directional - specific search ellipses were guided by the local orientation of the mineralized structures for an anisotropic search . The search radii were influenced and determined by both the grade and indicator variograms . The third direction of the search radii was primarily influenced by the average widths of mineralization observed in the underground mapping . Grade distributions, sample spacing and kriging neighbourhood analyses (KNA) were used to help guide the number of composites to use for the grade interpolations . Search neighbourhoods used different capping levels, as determined through the threshold analyses from Section 14 . 7 . 2 . Search ellipse and estimation parameters are presented in Table 14 . 5 . 163 Tintic Project April 25, 2024

Osisko Development Corp. Tintic Project 164 April 25, 2024 Table 14.4 Variogram Models for Gold and Silver for each Mineralized Domain Structure 2 Range (m) Structure 1 Range (m) Rotation Angles Au Variograms Vertical Dip Strike Sil Vertical Dip Strike Sil Type Plunge (Y) Dip (X) Dip Direction (Z) Nugget Domain 9.14 12.19 12.19 0.32 2.44 6.10 3.96 0.48 Spherical 170 75 80 0.20 T4 3.05 10.67 16.76 0.32 1.52 9.75 7.01 0.18 Spherical 170 90 80 0.50 T2 16.76 16.76 16.76 0.33 3.66 3.66 3.66 0.62 Spherical 0 0 0 0.05 T3 4.57 9.14 13.72 0.22 3.05 7.01 8.53 0.58 Spherical 170 70 90 0.20 Wild Cat 9.14 13.72 18.29 0.22 8.84 11.89 10.67 0.68 Spherical - 160 40 90 0.10 40 Fault 9.14 9.14 15.24 0.59 8.84 8.84 13.41 0.01 Spherical 110 115 80 0.40 75 - 85 Structure 2 Range (m) Structure 1 Range (m) Rotation Angles Ag Variograms Vertical Dip Strike Sil Vertical Dip Strike Sil Type Plunge (Y) Dip (X) Dip Direction (Z) Nugget Domain 18.29 18.29 15.24 0.34 3.05 4.27 6.71 0.36 Spherical 170 75 80 0.30 T4 4.57 9.14 24.38 0.39 3.05 8.84 6.71 0.01 Spherical 180 90 80 0.60 T2 12.19 12.19 12.19 0.22 4.88 4.88 4.88 0.18 Spherical 0 0 0 0.60 T3 9.14 4.57 9.14 0.2 8.23 3.05 3.35 0.75 Spherical 170 70 90 0.05 Wild Cat 9.14 33.53 24.38 0.43 8.23 3.66 8.23 0.43 Spherical - 160 40 90 0.14 40 Fault 6.10 6.10 3.66 0.12 4.57 2.74 0.91 0.48 Spherical 180 115 80 0.40 75 - 85 Table supplied by Osisko Development.

Osisko Development Corp. Tintic Project 165 April 25, 2024 Figure 14.3 Example of Experimental and Modelled Variogram (Correlogram) for Gold in the T2 Domain Figure supplied by Osisko Development. Ranges on variograms are measured in feet and converted to metres for reporting purposes.

Osisko Development Corp. Table 14.5 Estimation Parameters used for each Mineralized Domain 166 Tintic Project April XX, 2024 Multi Capping Ranges (m) Orientation Ag g/t Cap Au g/t Cap Z (m) Y (m) X (m) Plunge (Z) Dip (X) Azi (Z) Min DDH Max Cmp Min Cmp Pass Domain 300 50 1.5 6.1 9.1 ANISOTROPIC 2 6 3 1 T4 125 20 3.0 12.2 18.3 ANISOTROPIC 2 6 3 2 125 20 6.1 61.0 91.4 ANISOTROPIC 2 8 3 3 2300 1600 1.5 6.1 9.1 ANISOTROPIC 2 6 3 1 T2 1300 250 3.0 12.2 18.3 ANISOTROPIC 2 6 3 2 1300 250 30.5 61.0 91.4 ANISOTROPIC 2 8 3 3 300 50 1.5 6.1 9.1 ANISOTROPIC 2 6 3 1 T3 125 20 3.0 12.2 18.3 ANISOTROPIC 2 6 3 2 125 20 30.5 61.0 91.4 ANISOTROPIC 2 8 3 3 300 50 1.5 6.1 9.1 ANISOTROPIC 2 6 3 1 Wild Cat 125 20 3.0 12.2 18.3 ANISOTROPIC 2 6 3 2 125 20 30.5 61.0 91.4 ANISOTROPIC 2 8 3 3 300 50 1.5 6.1 9.1 ANISOTROPIC 2 6 3 1 40 Fault 125 20 3.0 12.2 18.3 ANISOTROPIC 2 6 3 2 125 20 30.5 61.0 91.4 ANISOTROPIC 2 8 3 3 600 90 1.5 6.1 9.1 ANISOTROPIC 2 6 3 1 75 - 85 250 55 3.0 12.2 18.3 ANISOTROPIC 2 6 3 2 250 55 30.5 61.0 91.4 ANISOTROPIC 2 8 3 3 Table supplied by Osisko Development . 14.8 B LOCK M ODEL AND G RADE I NTERPRETATION The criteria used in the selection of block size include drill hole spacing, composite length, the geometry of the modelled zone, and the anticipated mining methods . The characteristics of the block model are summarized in Table 14 . 6 . Sub - celling of the parent block size is used to efficiently represent the volumes of the modelled mineralized domains . Sub - cells were assigned the same values as their parent cell . No rotation was applied to the block model . Three search passes were used for interpolating grades into the block model, applying the appropriate grade caps . A series of sensitivity runs were performed to examine the impact of various parameters on the estimation . Parameters were selected, and gold and silver grades were interpolated using inverse distance squared (ID 2 ) methodology . Each subsequent estimation pass used increasing search neighbourhood sizes determined from grade and indicator variogram results and industry best practices . Samples from a minimum of two drill holes or chip strings were required to estimate all blocks .

Osisko Development Corp. Table 14.6 Summary of the Block Model Characteristics 167 Tintic Project April XX, 2024 Block Model Parameters Min Subcell (m) Block Size (m) Min Subcell (ft) Block Size (ft) No. of Blocks Origin Axis 0.30 1.22 1.0 4.0 265 21,400 X 0.30 2.44 1.0 8.0 265 22,400 Y 0.30 2.44 1.0 8.0 140 4,800 Z The local grid system uses US measurements, so block sizes were originally designated in feet and were converted to metres for reporting purposes. Table supplied by Osisko Development. 9. M ODEL V ALIDATION Mineralized domain models were validated using a variety of methods including visual inspection of the model grades and grade distributions compared to the informing raw samples, statistical comparisons of informing composites to the model for local and global bias, and reconciliation comparing the model to observed grades from underground development . All analyses indicate that the model follows the grade distribution of the informing composites and the accuracy of the model is considered to have been demonstrated . The total global comparison for each search neighbourhood is within an 8 % tolerance for bias and a local comparison is within 1 % for a three - month average reconciliation . The QP considers the model to be a reasonable representation of the Trixie mineralization, based on the current level of sampling . 1. Visual Inspection Figure 14 . 4 presents section views of the model compared with the raw informing sample data . The visual validation confirms that the block model honours the drill hole and chip sample data and justifies the use of multiple capping grades . 2. Statistical Comparisons Ordinary kriging (OK), Inverse Distance Cubed (ID 3 ) and Nearest Neighbour (NN) interpolations were performed to check for local and global bias in the models . All interpolations matched well with the ID 2 interpolations, and a global bias analysis (Table 14 . 7 ) comparing the “representative declustered” NN mean estimate grade to the ID 2 mean estimate grade at zero cut - off indicates a variance of less than 8 % , with the material within the first search neighborhood being within the 5 % acceptable tolerance . The trend and local variation of the estimated ID 2 models were compared with the declustered composite data, using swath plots in three directions (North, East and Elevation) . The ID 2 models show similar trends in grades, with the expected smoothing for the method when compared to the composite data . Figure 14 . 5 shows the swath plot in the three principal directions of the T 2 domain, as an example .

Osisko Development Corp. Tintic Project 168 April 25, 2024 Figure 14.4 Visual Model Validation Comparison of Block Grades with Raw Sample Grades; Left: Plan View at 5,432 +/ - 1.5 m; Right: Vertical Section Looking North at Northing 23,756 +/ - 1.5 m Figure supplied by Osisko Development.

Osisko Development Corp. Tintic Project 169 April 25, 2024 Table 14.7 Global Bias Analysis Between the Interpolation Methods Global Bias Check (Silver Mineralization) Global Bias Check (Gold Mineralization) ID 2 vs NN ID 2 NN ID vs NN ID 2 NN Tons Domain Search Neighborhood 0.3% 9.50 9.47 1.3% 1.02 1.00 744,419 T4 SVOL 1 1.7% 139.52 137.23 1.7% 122.61 120.59 40,839 T2 - 2.0% 108.89 111.09 4.4% 8.78 8.41 3,221 T3 4.8% 34.63 33.04 2.4% 7.30 7.13 9,696 Wild Cat 2.8% 44.75 43.54 7.9% 6.88 6.37 7,308 40 Fault 1.1% 59.39 58.76 - 1.6% 8.28 8.41 32,921 75 - 85 1.0% 18.78 18.59 1.5% 7.38 7.27 838,404 TOTAL - 2.1% 6.06 6.20 - 10.6% 0.56 0.62 2,372,709 T4 SVOL 2 12.8% 37.20 32.98 - 0.4% 17.96 18.03 45,970 T2 - 1.7% 70.84 72.08 31.7% 4.48 3.40 5,334 T3 3.4% 36.16 34.96 - 3.2% 7.09 7.33 10,793 Wild Cat - 11.4% 39.59 44.69 - 10.0% 5.71 6.35 12,845 40 Fault - 6.9% 63.80 68.55 - 8.3% 8.06 8.78 104,646 75 - 85 - 2.7% 9.42 9.69 - 7.1% 1.24 1.33 2,552,298 TOTAL 6.0% 4.68 4.41 16.4% 0.33 0.28 12,788,087 T4 SVOL 3 35.8% 30.83 22.70 - 7.6% 2.60 2.81 152,404 T2 70.0% 60.66 35.68 179.1% 2.60 0.93 17,347 T3 53.7% 38.16 24.83 69.1% 6.88 4.07 3,505 Wild Cat 15.5% 36.75 31.80 5.5% 5.47 5.19 20,036 40 Fault 39.1% 40.72 29.28 62.7% 5.46 3.36 321,973 75 - 85 12.6% 5.98 5.31 24.4% 0.49 0.40 13,303,352 TOTAL 7.6% 7.15 6.65 7.7% 0.95 0.88 16,694,053 Trixie Total *Bias = (ID - NN)/NN Table supplied by Osisko Development. *The tonnage is reported in Short Tons (ST) using the US measurement system. **The NN and ID 2 interpolations use metric measurements of grams per metric tonne.

Osisko Development Corp. Tintic Project 170 April 25, 2024 Figure 14.5 Statistical Model Validation; Swath Plots in the Three Principal Orientations and the Gold Grade Histogram, Comparing Declustered Sample Grades with the Estimated Model Grades (Example from the T2 Domain) Figure supplied by Osisko Development.

Osisko Development Corp. 14.9.3 Reconciliation Underground development grades have been measured and tracked during the exploratory mining throughout the 2022 and 2023 campaign . Model grade interpolations were reconciled with the tracked grades over various development areas and time frames . Table 14 . 8 shows the comparisons and the reconciliation factors from this analysis . Table 14.8 Local Reconciliations of Underground Development Data with the Resource Model 171 Tintic Project April 25, 2024 Reconciliation Factor Model Au g/t (AUID 2 ) Claimed Au g/t Tonnes Month Heading 71% 55.419 33.06 1,209 Sep - 22 625 - 607.5 34% 80.193 57.55 384 Sep - 22 625 - S1C5 - 56% 26.603 57.55 255 Sep - 22 625 - S1C6 - 98% 0.652 39.64 593 Sep - 22 R6 6% 43.008 40.62 2,442 TOTAL - 49% 42.180 82.63 1,385 Oct - 22 625 - 607.5 - 2% 67.139 70.76 545 Oct - 22 625 - R1SPC1 3% 73.403 69.54 669 Oct - 22 625 - R1SPC2 141% 232.033 99.64 332 Oct - 22 625 - S1C6 46% 149.197 99.64 310 Oct - 22 625 - S1C7 - 3% 82.500 85.71 3,241 TOTAL 20% 295.330 246.66 477 Nov - 22 R1NPC1 - 34% 174.853 258.30 163 Nov - 22 R1NPC2 6% 264.680 249.62 640 TOTAL 0.97% Weighted Average 3 - month Reconciliation Factors Table supplied by Osisko Development. 14.10 M INERAL R ESOURCE C LASSIFICATION Mineral Resource classification was determined through geometric criteria deemed reasonable for the deposit by the QP . For the 75 - 85 domain, no material has been classified as measured, due to the lack of chip sample data that fully crosscuts or follows the mineralization . This lack of chip sample data adds uncertainty to the grade continuity for this domain . For the T 2 , T 3 , T 4 , Wild Cat, and 40 Fault domains, the Measured classification was assigned to those continuous blocks within the mineralized domains that were informed by composites from at least two drill holes or chip strings, and which were less than 7 . 6 m from the nearest chip sample composite . For all Domains, the Indicated classification was assigned to those continuous blocks within the mineralized domains that were informed by composites from at least two drill holes or chip sample

Osisko Development Corp. strings, and which were less than 15 . 2 m to the nearest composite, with an average composite spacing less than 24 . 4 m . The Inferred classification was assigned to those continuous blocks within the mineralized domains that were informed by composites from at least two drill holes or chip sample strings, and which were less than 50 . 3 m from the nearest composite, or with an average composite spacing less than 100 . 6 m . Blocks estimated within the mineralized domains not meeting the above criteria were not classified and are excluded from the resource estimate . 14.11 R EASONABLE P ROSPECTS FOR E VENTUAL E CONOMIC E XTRACTION A reasonable economic cut - off grade for resource evaluation at the Trixie deposit is 4 . 32 g/t Au . This was determined using the parameters presented in Table 14 . 9 . The QP considers the selected cut - off grade of 4 . 32 g/t Au to be appropriate, based on the current knowledge of the project . The Deswik Stope Optimizer (DSO) was used to demonstrate spatial continuity of the mineralized zones within “potentially mineable shapes” . The DSO parameters used a minimum mining shape of 6 . 1 m along the strike of the deposit, a height of 6 . 1 m and a minimum width of 1 . 5 m . The maximum shape measures 6 . 1 m x 6 . 1 m x 12 . 2 m in width . Only those blocks of the model constrained by the resulting conceptual mineable shapes are reported as resources . It is the QP’s opinion that the use of the conceptual mining shapes as constraints to report Mineral Resource Estimates demonstrates that the resource estimate meets the criteria defined in the CIM Definition Standards ( 2014 ), and the MRMR Best Practice Guidelines ( 2019 ) for “reasonable prospects for eventual economic extraction” . Table 14.9 Resource Cut - Off Grade Parameters 172 Tintic Project April 25, 2024 Values (USD) Parameters $74.33 Mining Cost ($/ST) $52.71 G&A ($/ST) $41.00 Heap Leach Processing ($/ST) $2.65 Total Refining Cost /oz $1,750.00 Gold Price ($/oz) 4.50% Royalty (Combination) 80.0% Heap Leach Au Recovery 4.32 Cut - off Grade (COG) Table supplied by Osisko Development. ST = Short Ton. Estimated economics of the resources were based on the gold equivalent content within the mineralized domains . The gold equivalence was calculated by incorporating the silver content based on a silver : gold ratio, calculated with the gold price and metallurgical recovery reported in Table 14 . 9 , and a silver price of US $ 23 . 00 /oz and a silver metallurgical heap leach recovery of 45 % .

Osisko Development Corp. 12. M INED V OID D EPLETION All current underground development at the Trixie deposit has been performed by TCM . The void solids for this development are surveyed, modelled, and kept up to date by the TCM technical team . Using recent drill hole intercepts of historic voids along with historic level plans, sections, and reports, an attempt was made through 2023 to re - model the 3 D historic mine workings . Through collaboration between the geology and engineering teams, it has been determined that the re - modelled shapes are accurate, given the current data available . Even with the recent re - modelling of the historic development shapes, there is still a level of uncertainty in their location . To reduce the risk this uncertainty poses, it was determined to use buffers around the historical shapes to deplete the resource estimate . A 6 . 1 m buffer was developed around the main shaft and the ventilation raise, as these are critical pieces of infrastructure . A 3 . 0 m buffer was developed around most of the remaining re - modelled historic levels and stopes and a 1 . 5 m buffer was developed around the historic development in the area where a high percentage of recent drill holes intersected the voids . The frequency of the recent void intersects in diamond drill holes provides us a higher confidence in their location with respect to the other historical shapes . Figure 14 . 6 identifies the voids used to deplete the current MRE . 13. M INERAL R ESOURCE E STIMATE The QPs have classified the initial MRE as Measured, Indicated and Inferred mineral resources based on data density, search ellipse criteria and interpolation parameters . The 2024 Trixie MRE is considered to be a reasonable representation of the mineral resources of the Trixie deposit, based on the currently available data and geological knowledge . The Mineral Resource Estimate follows the 2014 CIM Definition Standards on Mineral Resources and Reserves . The effective date of the 2024 Mineral Resource Estimate is March 15 , 2024 . Table 14.10 displays the results of the MRE at the official 4.32 g/t Au cut - off grade for the Trixie deposit. 14. M INERAL R ESOURCE G RADE S ENSITIVITY A NALYSIS Table 14 . 11 shows the cut - off grade sensitivity analysis of gold and silver for the 2024 Trixie MRE . The reader should be cautioned that the figures provided in Table 14 . 11 should not be interpreted as a mineral resource statement . The reported quantities and grade estimates at different cut - off grades are presented for the sole purpose of demonstrating the sensitivity of the mineral resource model for gold to the selection of a reporting cut - off grade . Figure 14 . 7 and Figure 14 . 8 present the grade tonnage curves built on the cut - off grade sensitivity data presented in Table 14 . 11 . Micon’s QP has reviewed the MRE cut - off grades used in the sensitivity analysis, and it is the opinion of the QP that they meet the test for reasonable prospects of eventual economic extraction at varying prices of gold or other underlying parameters used to calculate the cut - off grade . 173 Tintic Project April 25, 2024

Osisko Development Corp. Tintic Project 174 April 25, 2024 Figure 14.6 Vertical Long Section Looking East at the Current Development Voids and Historical Buffers, Used to Deplete the Trixie Mineral Resources Figure supplied by Osisko Development.

Osisko Development Corp. Tintic Project 175 April 25, 2024 Table 14.10 Trixie Deposit Mineral Resource Estimate (MRE) Statement Contained Metal Grade Gold Equivalent Contained Metal Grade Silver Contained Metal Grade Gold Quantity Cut - off Grade Classification Gold Equivalent ('000 oz) (g/T) Silver ('000 oz) (g/T) Gold ('000 oz) (g/T) ('000 T) Gold (g/T) 107 27.82 238 61.73 105 27.36 120 4.32 Measured 47 11.62 240 59.89 45 11.17 125 4.32 Indicated 154 19.56 478 60.80 150 19.11 245 4.32 Total Measured + Indicated 53 8.16 315 48.55 51 7.80 202 4.32 Inferred Notes: 1. Effective date of the Mineral Resource Estimate (MRE) is 15 March, 2024 . 2. William Lewis P . Geo, of Micon International Limited and Alan S J San Martin, AusIMM(CP), of Micon International Limited have reviewed and validated the MRE for Trixie and are independent “Qualified Persons” as defined in National Instrument 43 - 101 – Standards of Disclosure for Mineral Projects (NI 43 - 101 ) . They are responsible for the 2024 Trixie MRE . 3. The mineral resources disclosed in this report were estimated using the CIM standards on mineral resources and reserves definitions, and guidelines prepared by the CIM standing committee on reserve definitions and adopted by the CIM council . 4. Mineral Resources are reported when they are within potentially mineable shapes derived from a stope optimizer algorithm, assuming an underground longhole stoping mining method with stopes of 6 . 1 m x 6 . 1 m x minimum 1 . 5 m dimensions . 5. Mineral Resources are not mineral reserves and do not have demonstrated economic viability . 6. Geologic modelling was completed by Osisko Development’s senior production geologist Jody Laing, PGeo . using Leapfrog Geo software . The MRE was completed by Osisko Development’s chief resource geologist, Daniel Downton, P . Geo using Datamine Studio RM 2 . 0 software . The MRE was reviewed and validated by William Lewis and Alan San Martin of Micon . 7. The estimate is reported for an underground mining scenario and with reasonable assumptions . The cut - off grade of 4 . 32 g/t Au was calculated using a gold price of USD 1 , 750 /oz, a CAD : USD exchange rate of 1 . 3 ; total mining, processing and G&A costs of USD 168 . 04 /US ton, a refining cost of USD 2 . 67 /ounce a combined royalty of 4 . 5 % and an average metallurgical recovery of 80 % . 8. The stope optimizer algorithm evaluated the resources based on a gold equivalent grade which incorporates the silver grade estimate and assumes a silver price of $ US 23 /oz and metallurgical silver recovery of 45 % . 9. Average bulk density values in the mineralized domains were assigned to the T 2 ( 2 . 955 T/m 3 ), T 3 ( 2 . 638 T/m 3 ), T 4 ( 2 . 618 T/m 3 ), Wild Cat, and 40 Fault ( 2 . 621 T/m 3 ), and 75 - 85 ( 2 . 617 T/m 3 ) domains . 10. Inverse Distance Squared interpolation method was used with a parent block size of 1 . 2 m x 2 . 4 m x 2 . 4 m . 11. The Mineral Resource results are presented in - situ . Estimations used metric units (metres, tonnes, g/t) . The number of tonnes is rounded to the nearest thousand . Any discrepancies in the totals are due to rounding effects . 12. Neither Osisko Development nor the Micon QPs are aware of any known environmental, permitting, legal, title - related, taxation, socio - political, marketing or other relevant issue that could materially affect the mineral resource estimate other than disclosed in the Technical Report .

Osisko Development Corp. Table 14.11 Gold Grade Sensitivity Analysis at Different Cut - Off Grades 176 Tintic Project April 25, 2024 ~ Au Price @ COG AuEq oz AuEq g/T AG oz AG g/T AU oz AU g/T COG Tonnes Classification 170,985 12.48 628,563 45.87 166,338 12.14 2.00 426,210 Measured + Indicated 168,810 13.34 610,382 48.24 164,297 12.98 2.25 393,582 166,715 14.16 590,666 50.18 162,348 13.79 2.50 366,130 164,787 14.88 572,631 51.71 160,553 14.50 2.75 344,413 162,831 15.62 555,740 53.31 158,722 15.23 3.00 324,251 161,276 16.33 541,350 54.83 157,273 15.93 3.25 307,112 ~$2,100 159,603 17.06 525,681 56.19 155,716 16.64 3.50 291,005 ~$2,000 157,708 17.90 510,470 57.94 153,934 17.47 3.75 274,040 ~$1,900 156,010 18.58 495,091 58.95 152,350 18.14 4.00 261,219 ~$1,800 154,159 19.37 480,968 60.43 150,604 18.92 4.25 247,549 153,782 19.56 478,078 60.80 150,248 19.11 4.32 244,590 ~$1,700 152,734 20.03 469,058 61.52 149,266 19.58 4.50 237,143 ~$1,600 151,156 20.75 457,428 62.80 147,774 20.29 4.75 226,567 ~$1,500 149,987 21.47 447,646 64.07 146,677 20.99 5.00 217,327 ~$1,450 148,801 22.22 436,296 65.16 145,575 21.74 5.25 208,263 ~$1,400 147,032 23.03 422,504 66.19 143,909 22.55 5.50 198,538 145,466 23.78 412,467 67.43 142,416 23.28 5.75 190,247 144,144 24.52 403,074 68.57 141,164 24.01 6.00 182,842 142,117 25.52 389,880 70.02 139,235 25.01 6.25 173,188 140,550 26.34 380,902 71.39 137,734 25.81 6.50 165,955 139,599 27.31 374,280 73.21 136,832 26.76 6.75 159,018 138,207 28.10 365,663 74.34 135,503 27.55 7.00 152,986 86,977 4.79 561,011 30.88 82,830 4.56 2.00 565,158 Inferred 82,529 5.12 525,360 32.61 78,645 4.88 2.25 501,077 77,645 5.51 485,528 34.46 74,056 5.26 2.50 438,189 73,042 5.90 451,119 36.46 69,707 5.63 2.75 384,864 69,162 6.27 423,112 38.38 66,034 5.99 3.00 342,880 65,928 6.60 399,562 39.98 62,974 6.30 3.25 310,856 ~$2,100 62,549 6.96 376,306 41.84 59,767 6.65 3.50 279,722 ~$2,000 58,868 7.39 352,865 44.28 56,260 7.06 3.75 247,838 ~$1,900 55,904 7.76 333,578 46.31 53,438 7.42 4.00 224,039 ~$1,800 53,379 8.10 318,207 48.26 51,026 7.74 4.25 205,085

Osisko Development Corp. ~ Au Price @ COG AuEq oz AuEq g/T AG oz AG g/T AU oz AU g/T COG Tonnes Classification 52,895 8.16 314,678 48.55 50,569 7.80 4.32 201,603 ~$1,700 51,262 8.39 304,803 49.90 49,009 8.02 4.50 190,002 ~$1,600 49,181 8.71 291,971 51.73 47,022 8.33 4.75 175,561 ~$1,500 47,381 8.99 279,718 53.08 45,313 8.60 5.00 163,894 ~$1,450 45,508 9.28 267,379 54.53 43,531 8.88 5.25 152,515 ~$1,400 43,625 9.57 254,818 55.92 41,742 9.16 5.50 141,728 42,000 9.84 244,126 57.21 40,196 9.42 5.75 132,718 40,255 10.14 233,028 58.70 38,532 9.71 6.00 123,472 38,480 10.46 219,939 59.80 36,854 10.02 6.25 114,401 36,815 10.79 206,087 60.43 35,291 10.35 6.50 106,080 35,310 11.11 194,185 61.10 33,874 10.66 6.75 98,845 33,747 11.44 182,579 61.91 32,397 10.99 7.00 91,725 Table supplied by Osisko Development. Figure 14.7 Grade Tonnage Curves Indicating the Sensitivity of the Measured and Indicated Mineral Resources at Different Cut - Off Grades Figure supplied by Osisko Development. 177 Tintic Project April 25, 2024

Osisko Development Corp. Figure 14.8 Grade Tonnage Curves Indicating the Sensitivity of the Inferred Mineral Resources at Different Cut - Off Grades Figure supplied by Osisko Development. 14.15 F ACTORS T HAT C OULD A FFECT THE M INERAL R ESOURCE E STIMATES All estimation models have a degree of uncertainty associated with them due to the assumptions used in their development . These uncertainties lead to risks in the relative accuracy of the models . In the development of the 2024 MRE model, the Osisko Development and TCM teams have used industry best practice guidelines and have reasonably mitigated much of the potential risks . It is the QP’s opinion that the factors set out below could affect the mineral resource estimate .  The geological interpretations and assumptions used to generate the estimation domains.  Mineralization and geologic geometry and continuity of mineralized zones.  Estimates of mineralization and grade continuity.  The treatment of high - grade gold and silver values.  The grade interpolation methods and estimation parameter assumptions.  The confidence assumptions and methods used in the mineral resource classification.  The density and the methods used in the estimation of density.  Metal price and other economic assumptions used in the cut - off grade determination. 178 Tintic Project April 25, 2024

Osisko Development Corp.  Input and design parameter assumptions that pertain to the underground mining constraints .  Assumptions as to the continued ability to access the test mine site, retain mineral and surface rights titles, maintain the operation within environmental and other regulatory permits, and maintain the social license to operate . No environmental, permitting, legal, title, taxation, socio - economic, marketing, political or other relevant factors are known to the QP that would materially affect the estimation of Mineral Resources, other that those discussed in this report . 14.16 R ESPONSIBILITY FOR THE T RIXIE M INERAL R ESOURCE E STIMATE The geologic modelling for the Trixie deposit was completed by Osisko Development’s senior modelling geologist Jody Laing, P . Geo . , using Leapfrog Geo software . The MRE was completed by Osisko Development’s chief resource geologist, Daniel Downton, P . Geo . , using Datamine Studio RM 2 . 0 software . The MRE was then reviewed and validated by William Lewis, P . Geo . and Alan San Martin, AusIMM(CP), of Micon . For the purpose of disclosure in this Technical Report, William Lewis, P . Geo . , who is independent of Osisko Development and is a Qualified Person within the meaning of NI 43 - 101 , is responsible for the mineral resource estimate by virtue of his review and validation of the work conducted by Osisko Development . 179 Tintic Project April 25, 2024

Osisko Development Corp. TECHNICAL REPORT SECTIONS NOT REQUIRED The following sections which form part of the NI 43 - 101 reporting requirements for advanced projects or properties are not relevant to the current Technical Report. 15.0 MINERAL RESERVE ESTIMATES 16.0 MINING METHODS 17.0 RECOVERY METHODS 18.0 PROJECT INFRASTRUCTURE 19.0 MARKET STUDIES AND CONTRACTS 20.0 ENVIRONMENTAL STUDIES, PERMITTING, AND SOCIAL OR COMMUNITY IMPACT 21.0 CAPITAL AND OPERATING COSTS 22.0 ECONOMIC ANALYSIS 180 Tintic Project April 25, 2024

Osisko Development Corp. 23.0 ADJACENT PROPERTIES Ivanhoe Electric Inc . (Ivanhoe Electric) and Freeport McMoRan Inc . (Freeport McMoRan), along with various other private landowners hold the adjacent property to the Osisko Development Tintic Project ( Figure 23 . 1 ) . Much of this land has been used historically for various mining related purposes, including the processing and transportation of ore material, in addition to ranching and farming . Figure 23.1 Map of Adjacent Property Land Holders Figure provided by Osisko Development. 181 Tintic Project April 25, 2024

Osisko Development Corp. 1. F REEPORT M C M O R AN Freeport - McMoran Mineral Properties Inc . (FMMP) holds approximately 13 km 2 of mineral claims to the southwest of the Tintic Project, including the Southwest Tintic Porphyry target and the Treasure Hill lithocap . FMMP acquired the claims from Quaterra Resources Inc . (Quaterra Resources) in the late 2000 ’s (source : Quaterra Resources website) . A non - NI 43 - 101 compliant resource estimate of 600 million tons of 0 . 28 % copper and 0 . 1 % molybdenum was based on six drill holes which intercepted mineralization at a depth greater than 360 m ( 1 , 180 ft) (Krahulec, 1996 ) . Treasure Hill hosts north - northeast trending pyrite - enargite veins . The top of the hill is characterized by strongly silicified shingle breccia, with several other breccia pipes having been mapped in the surrounding area (Krahulec and Briggs, 2006 ) . There is little publicly available data on the current status of exploration on the Freeport - McMoRan held claims . The following has been extracted from a 2011 press release by Quaterra Resources : FMMP completed a total of seven reverse circulation and three diamond core holes, for a total of 4 , 323 m, to depths ranging from 122 m to 1 , 265 m . Widespread propylitic and quartz - sericite - pyrite, and lesser biotite alteration were intersected, containing generally narrow intervals of low - grade copper mineralization . Drill hole STFM - 3 (TD 378 m) intersected 34 m of 0 . 20 % Cu starting at 52 m depth in the Diamond Gulch area . That intersection was underlain by a zone of weak associated biotite alteration prior to going back into sericite - chlorite - pyrite alteration in the lower part of the hole . Elsewhere, hole STFM - 1 intersected 15 m of 0 . 22 % Cu starting at 107 m, within pyritic, advanced - argillic altered volcanic rocks, followed by quartz - sericite and biotite alteration with isolated short intervals containing 0 . 1 to 0 . 3 % Cu . 1. 1996 Historic Mineral Resources The historical 1996 mineral resource estimate was compiled prior to the introduction of CIM reporting standards for resources and reserves . While the resources were conducted according to the standards of the time, none of the information regarding the key assumptions, parameters and methodology used to define the historical mineral resources are reported . The historical resource is reported here only as part of the public information regarding the mineral district within which the Trixie deposit is located . 2. I VANHOE E LECTRIC Ivanhoe Electric Inc . (Ivanhoe Electric) holds approximately 65 km 2 of patented and unpatented mineral claims with an additional approximately 75 km 2 of leases and prospecting permits, all of which are located to the west and south of Osisko Development’s Tintic Project . Ivanhoe Electric initiated an exploration drill program in 2022 after more than five years of digitization of old mine records and geologic mapping . (Press release 11 / 22 / 2022 ) . The following summary has been extracted from the Ivanhoe Electric Inc . 2021 NI 43 - 101 Technical Report . 182 Tintic Project April 25, 2024

Osisko Development Corp. 1. Property Description and Ownership Ivanhoe Electric’s holdings include a gold, silver, and base metal Carbonate Replacement Deposit (CRD), skarn, fissure vein, and copper - gold porphyry exploration project located in the historical Tintic Mining District (the District) of central Utah . The district is the site of significant historical production and over 125 years of exploration activity . The Project is located near the City of Eureka, approximately 95 km south of Salt Lake City, and can be accessed from U . S . Highway 6 , approximately 30 km west of the Interstate 15 junction . It is crossed by many historical mine roads and defunct railroad paths, which provide access to most of the property . The exploration area covers approximately 65 km 2 of private patented claims, unpatented claims, state leases and prospecting permits consolidated by Ivanhoe Electric into a cohesive package . There is currently no mining taking place on the Project . In 2019 , Nordmin Resource & Industrial Engineering USA was commissioned by Ivanhoe Electric to investigate and prepare an underground rehabilitation work plan and cost estimate for the Sioux - Ajax Tunnel, Grand Central Shaft, Holden Tunnel, Mammoth Shaft and Lower Mammoth Tunnel to make these areas accessible for mapping, sampling and, in some cases, drilling . The Sioux - Ajax Tunnel and Grand Central Shaft are of highest priority for accessing the current and potential future drill targets and geologic mapping and sampling programs . Between November 2017 and May 2021, Ivanhoe Electric completed comprehensive work programs including:  Surface geological mapping at 1:2,500 scale across 15 km 2 , in conjunction with sampling and analyzing 576 rock samples.  Petrography and age dating of selected surface and underground rock samples.  Completion of two geophysics surveys: a 2,850 km 2 airborne magnetic survey and a 72 km 2 deep penetrating (>1,500 m depth), three - dimensional ground induced polarization survey.  Compilation and digitization of over 500 historical maps and mine plans and sections.  Geological mapping and rock chip sampling in the Sioux - Ajax Tunnel. The significant work undertaken by Ivanhoe Electric has resulted in over 14 well described, geologically and geophysically supported exploration areas being recognized, four of which have been prioritized for an initial drilling program . 23.3 QP C OMMENTS Micon has not verified the information regarding the mineral deposits and showings described above that are outside the immediate area of the Trixie deposit or the property held by Osisko Development . The information contained in this section of the report, which was provided by Osisko Development, is not necessarily indicative of the mineralization at the Trixie deposit . 183 Tintic Project April 25, 2024

Osisko Development Corp. 1. OTHER RELEVANT DATA AND INFORMATION This section includes additional information intended to further the understanding of the reader regarding the Tintic Project and Trixie test mine . 1. T RIXIE T EST M INE Since acquisition by Osisko Development in May, 2022 , the Trixie test mine has been subject to development, rehabilitation and exploration . The material excavated during these activities has been processed at the pilot scale vat leach facility located at the old Burgin concentrator site . Details of processing activities up to the date of this Technical Report are summarized in Table 24 . 1 . Table 24.1 Trixie Test Mine Key Operating Details 184 Tintic Project April 25, 2024 2023 2022 (June - End) Description 4,475 (4,061) 6,920 (6,278) Mineralized Material Milled in short tons (metric tonnes) 28 (25.4) 32.5 (29.5) Mill Throughput in short tons/day (metric tonnes/day) 1.4 (48) 1.46 (50.1) Blended T2 & T4 Diluted Head Grade in troy oz/ton Au (grams/metric tonne Au) 69% 70% Gold recovery (%) 4,959 8,845 Gold produced and sold (troy oz) 2,524 (769) 2,141 (653) Trixie portal development feet (metres) Table provided by Osisko Development . Development has been conducted on the 625 Level as well as a portal and decline toward the 625 Level from surface, and drill station construction . At the time of compiling this Technical Report, the decline has intersected the existing 625 Level . Additional development has continued on the 625 Level and three sub - levels above the 625 Level to further explore the T 2 /T 4 zone and develop future test stoping platforms . Figure 24 . 1 shows historic shafts and levels with modern excavations and the decline . The Tintic team has been rehabilitating the shaft between the 625 and 750 Levels as well as the 750 Level station and existing workings . Rehabilitation is ongoing . The primary activity at the Trixie test mine has been exploration . These activities have included drilling, drifting along strike of the mineralization and driving raises along the mineralization to access upper levels . Since acquisition, Osisko Development has driven, rehabilitated and enlarged over 12 , 139 ft ( 3 , 700 m) of drift . This drifting has been along the T 2 zone, across and within the T 4 zone, across the 75 - 85 zone, primary development, and re - accessing historic areas of the Trixie . A total of seven raises (two post - acquisition) have been excavated to explore up dip from the 625 Level and to test the contact with the overlying Ophir shale . At the time of writing this report, 545 ft ( 166 m) of raises have been driven . The exploration drifting, together with the drilling at the Trixie test mine are allowing Osisko Development to further define the extent of the mineralization identified to date . This work will also provide the base for further exploration at Trixie .

Figure 24.1 Trixie Test Mine Long Section Looking West Figure provided by Osisko Development. Figure cartoon only, not to scale. Tintic Project 185 April 25, 2024

Osisko Development Corp. 1. INTERPRETATIONS AND CONCLUSIONS 2. G ENERAL I NFORMATION With the acquisition of the Tintic Project in May, 2022 , Osisko Development has acquired the majority of the East Tintic Mining District in Utah . The East Tintic Mining District is part of the larger Tintic Mining District, where economic mineralization was first discovered in 1869 , and which, by 1899 , had become one of the richest mining districts in the United States . Active mining in the district continued through the 20 th and beginning of the 21 st century . The results of the 2022 and 2023 surface and underground exploration and development programs, along with the compilation of historic information for the mineral deposit at the Trixie test mine has allowed Osisko Development to disclose this 2024 MRE, which is an update to the Initial Mineral Resource Estimate dated January, 2023 for the Trixie deposit . 2. T RIXIE M INERAL R ESOURCE E STIMATE 1. Introduction The 2024 Mineral Resource Estimate for the Trixie deposit (the “ 2024 MRE”), was conducted in February and March 2024 . 2. Methodology The mineral resource area for the Trixie deposit covers a strike length of approximately 530 m down to a vertical depth of approximately 350 m below surface . The wireframe models for the Trixie deposit were prepared using LeapFrog GEO v . 2023 . 2 (LeapFrog) . Wireframe modelling included the construction of six mineralized domains constrained to the extents of the regional - scale Tintic Quartzite lithologic unit and capped by shale belonging to the overlying lower member of the Ophir Formation . Geostatistical analyses were carried out using Datamine Snowden Supervisor v . 8 . 15 . 0 . 3 (“Supervisor”) . The estimation, block model and grade interpolation, were prepared using Datamine StudioTM RM v . 2 . 0 . 66 . 0 (Datamine) . Resource - level potentially mineable underground shapes were created using the Deswik CAD v . 2023 . 2 . 762 Shape Optimizer module (Deswik . SO v . 5 . 0 . 3792 ) . 3. Resource Database The close - out date for the Trixie deposit 2024 MRE database is February 13 , 2024 . It consists of 161 validated diamond drill holes, totalling 9 , 305 . 51 m of assayed core and comprised of 8 , 373 sample intervals . The database also includes 22 validated RC drill holes, totalling 3 , 447 . 29 m of assayed RC drilling and comprises 2 , 430 sample intervals, and 1 , 387 underground chip sample strings comprised of 6 , 191 sample intervals assayed for gold and silver . Tintic Project 186 April 25, 2024

Osisko Development Corp. The database includes validated location, survey, and assay results . It also includes lithological descriptions taken from drill core logs . The database covers the strike length of each mineralized domain at variable drill hole and chip sample spacings, ranging from 1 . 5 to 50 m . In addition to the tables of raw data, each database includes several tables of calculated drill hole composites and wireframe solid intersections, which are required for the statistical evaluation and mineral resource block modelling . 4. Geological Model The geological model of the Trixie deposit was prepared in LeapFrog, using underground mapping, chip samples, RC drill holes, and validated diamond drill holes, all completed by February 13 , 2024 . A total of six mineralized domains were modelled with each domain restricted up dip by its contact with the lower shale member of the Ophir Formation, as this contact acts as an impermeable cap to mineralizing fluids . The domains modelled were the T 2 , T 3 , T 4 , Wild Cat, 40 Fault and the 75 - 85 . In addition, a north - south trending sub - vertically dipping fault structure has been mapped across multiple underground development headings near the 625 level and has been intercepted in multiple drill holes . Though the full extent of the structure is at present unknown, it is currently inferred to project through the entirety of the model . As underground mapping indicates a minor offset of the T 2 structure across this fault, it is used as a hard boundary for geological modelling and grade interpolation . The model is thus split into east and west fault blocks, with each mineralized domain subdivided into respective east and west subdomains . 5. Geostatistical Analysis 1. Compositing Most of the analytical samples were collected with lengths between 0 . 15 and 1 . 83 m . A modal composite length of approximately 1 . 22 m was applied to all domains, generating composites as close to 1 . 22 m as possible, while creating residual intervals with a minimum length of 0 . 06 m . Composite samples were derived from raw values within the modelled resource domains . 2. High grade Capping Multiple capping (different capping at different ranges in each domain) was selected as the capping methodology for high grade outlier gold and silver assays at the Trixie deposit . The top capping thresholds were selected based on the probability plots and vary from 50 . 0 g/t to 1 , 600 . 0 g/t Au and 300 . 0 g/t to 2 , 300 . 0 g/t Ag . Tintic Project 187 April 25, 2024

Osisko Development Corp. The maximum range for high - grade continuity was established using the indicator variograms, which suggests a loss of continuity after 3 . 0 m to 9 . 0 m, depending on the mineralized domain . A range of 7 . 6 m was selected and applied to all zones as a general average search range for the first pass grade top cut interpolation . The secondary capping thresholds were also selected based on the probability plots and vary from 20 . 0 g/t to 250 . 0 g/t Au and 125 . 0 g/t to 1 , 300 . 0 g/t Ag . Secondary capping was applied to the composites when search ranges exceeded 7 . 6 m . Continuity of the secondary capping was confirmed using indicator variograms . 3. Density The density databases contain 512 measurements taken on samples across multiple geologic domains. Average bulk density values in the mineralized domains were assigned to the T4 (2.618 t/m3), T2 (2.955 t/m3), T3 (2.638 t/m3), Wild Cat and 40 Fault (2.621 t/m3), and 75 - 85 (2.617 t/m3) domains. A density of 0.00 t/m3 was assigned to the underground development from all past mining activities. Bulk densities were used to calculate tonnages from the volume estimates in the block model. 4. Variogram Analysis The spatial distribution of gold and silver was evaluated through variogram analysis and spherical variograms were modelled for each of the mineralized domains. All variogram analyses and modelling were performed in “Supervisor” . Primary directions and orientations of the variograms were observed in the data and visually in 3 D space . These orientations were then examined statistically within the software package, to ensure that they represented the best possible fit of the geology and grade continuity . 5. Search Parameters For all domains, the 3 D directional - specific search ellipses were guided by the local orientation of the mineralized structures for an anisotropic search . The search radii were influenced and determined by both the grade and indicator variograms . The third direction of the search radii was primarily influenced by the average widths of mineralization observed in the underground mapping . Grade distributions and kriging neighbourhood analysis were used to help guide the number of composites to use for the grade interpolations. Search neighbourhoods used different capping levels as determined through a threshold analysis. Tintic Project 188 April 25, 2024

Osisko Development Corp. 6. Block Model and Grade Interpretation The criteria used in the selection of block size include drill hole spacing, composite length, the geometry of the modelled zone, and the anticipated mining methods . A block size of 1 . 22 x 2 . 44 x 2 . 44 m was used . Sub - cells were used, allowing a resolution of 0 . 30 m x 0 . 30 m x 0 . 30 m . Sub - celling of the parent block size is used to efficiently represent the volumes of the modelled mineralized domains . Sub - cells were assigned the same values as their parent cell . No rotation was applied to the block model . Three search passes were used for interpolating grades into the block model, applying the appropriate grade caps for each . A series of sensitivity runs were performed to examine the impact of various parameters on the estimation . Parameters were selected, and gold and silver were estimated using inverse distance squared (ID 2 ) . Each subsequent estimation pass used increasing search neighbourhood sizes, determined from grade and indicator variogram results . Samples from a minimum of two drill holes or chip strings were required to estimate all blocks . 7. Model Validation Mineralized domain models were validated using a variety of methods including visual inspection of the model grades, grade distributions compared to the informing raw samples, statistical comparisons of informing composites to the model for local and global bias, and reconciliation comparing the model to observed grades from underground development . All analyses indicate that the model follows the grade distribution of the informing composites and that the accuracy of the model has been demonstrated . The total global comparison for each search neighbourhood is within an 8 % tolerance for global bias and a local comparison is within 1 % for a three - month average reconciliation . The QP considers the model to be a reasonable representation of the Trixie mineralization, based on the current level of sampling and geological information . 8. Mineral Resource Classification Mineral Resource Classification was determined through geometric criteria deemed reasonable for the deposit . No material has been classified as measured for the 75 - 85 domain due to the lack of chip sample data that fully crosscuts or follows the mineralization . Blocks estimated within the mineralized domains not meeting the criteria to classify them as either measured, indicated or inferred were not classified and are not part of the mineral resource estimate . 9. Reasonable Prospects for Eventual Economic Extraction A reasonable economic cut - off grade for resource evaluation at the Trixie deposit is 4 . 32 g/t Au . This was determined using the parameters presented in Table 25 . 1 . The QP considers the selected cut - off grade of 4 . 32 g/t Au to be adequate based on the current knowledge of the deposit . Tintic Project 189 April 25, 2024

Osisko Development Corp. The DSO was used to demonstrate spatial continuity of the mineralized zones within “potentially mineable shapes” . The DSO parameters used a minimum mining shape of 6 . 1 m along the strike of the deposit, a height of 6 . 1 m and a minimum width of 1 . 5 m . The maximum shape measures 6 . 1 m x 6 . 1 m x 12 . 2 m in width . Only those blocks of the model constrained by the resulting conceptual mineable shapes are reported as resources . The use of the conceptual mining shapes as constraints to report the Mineral Resource Estimate demonstrates that the criteria defined in the CIM Definition Standards ( 2014 ), and the MRMR Best Practice Guidelines ( 2019 ) for “reasonable prospects for eventual economic extraction” have been met . Table 25.1 Resource Cut - Off Grade Parameters Tintic Project 190 April 25, 2024 Values (USD) Parameters $74.33 Mining Cost ($/ST) $52.71 G&A ($/ST) $41.00 Heap Leach Processing ($/ST) $2.65 Total Refining Cost /oz $1,750.00 Gold Price ($/oz) 4.50% Royalty (Combination) 80.0% Heap Leach Au Recovery 4.32 Cut - off Grade (COG) Table supplied by Osisko Development. The economics of the resources were based solely on the gold content within the mineralized domains . Silver resources reported are contained within those resource blocks determined to be potentially economically viable on the basis of their contained gold . 25.2.10 Mined Void Depletion All current underground development at the Trixie deposit has been conducted by TCM and the void solids for this development have been surveyed, modelled, and kept up to date by TCM . Using recent drill hole intercepts of historic voids along with historic level plans, sections, and reports, an attempt was made through 2023 to re - model the 3 D historic mine workings . To reduce the risk of the uncertainty in void locations, it was determined to use buffers around the historical shapes to deplete the resource estimate . A 6 . 1 m buffer was developed around the main shaft and the vent raise, as these are critical pieces of infrastructure . A 3 . 0 m buffer was developed around most of the remaining re - modelled historic levels and stopes . However, a 1 . 5 m buffer was developed around the historic development in the area where a high percentage of recent drill holes intersected the voids . The historical buffers and the current development voids are used to deplete the final mineral resource of the Trixie deposit .

Osisko Development Corp. 25.2.11 Trixie Mineral Resource Estimate Statement The QPs have classified the 2024 MRE as Measured, Indicated, and Inferred Mineral Resources based on data density, search ellipse criteria, and interpolation parameters . The 2024 MRE is considered a reasonable representation of the mineral resources of the Trixie deposit based on the current quality data and geological knowledge . The Mineral Resource Estimate follows the 2014 CIM Definition Standards on Mineral Resources and Reserves . Table 25 . 2 summarizes the results of the initial MRE for the Trixie deposit, at the 4 . 32 g/t Au cut - off grade . Tintic Project 191 April 25, 2024

Osisko Development Corp. Tintic Project 192 April 25, 2024 Table 25.2 Trixie Deposit Mineral Resource Estimate (MRE) Statement Contained Metal Grade Gold Equivalent Contained Metal Grade Silver Contained Metal Grade Gold Quantity Cut - off Grade Classification Gold Equivalent ('000 oz) (g/T) Silver ('000 oz) (g/T) Gold ('000 oz) (g/T) ('000 T) Gold (g/T) 107 27.82 238 61.73 105 27.36 120 4.32 Measured 47 11.62 240 59.89 45 11.17 125 4.32 Indicated 154 19.56 478 60.80 150 19.11 245 4.32 Total Measured + Indicated 53 8.16 315 48.55 51 7.80 202 4.32 Inferred Notes: 1. Effective date of the Mineral Resource Estimate (MRE) is 14 March 2024 . 2. Mr . William Lewis P . Geo . , of Micon International Limited and Alan J San Martin, AusIMM(CP), of Micon International Limited have reviewed and validated the MRE for Trixie and are independent “Qualified Persons” as defined in Canadian Institute of Mining, Metallurgy and Petroleum (“CIM”) in accordance with National Instrument 43 - 101 – Standards of Disclosure for Mineral Projects ("NI 43 - 101 ") responsible for the 2024 MRE . 3. The mineral resources disclosed in this presentation were estimated using the CIM standards on mineral resources and reserves definitions, and guidelines prepared by the CIM standing committee on reserve definitions and adopted by the CIM council . 4. Mineral Resources are reported when they are within potentially mineable shapes derived from a stope optimizer algorithm, assuming an underground longhole stoping mining method with stopes of 6 . 1 m x 6 . 1 m x minimum 1 . 5 m dimensions . 5. Mineral Resources are not mineral reserves and do not have demonstrated economic viability . 6. Geologic modelling was completed by Osisko Development modelling geologist Jody Laing, P.Geo., using Leapfrog Geo software. The MRE was completed by Osisko Development chief resource geologist, Daniel Downton, P.Geo. using Datamine Studio RM 2.0 software. William Lewis and Alan San Martin of Micon International Ltd. reviewed and validated the Mineral Resource Model. 7. The estimate is reported for an underground mining scenario and with USD assumptions. The cut - off grade of 4.32 g/t Au was calculated using a gold price of $US1,750/oz, a CAD:USD exchange rate of 1.3; total mining, processing and G&A costs of $US168.04/imperial ton, a refining cost of $US2.65/ounce, a combined royalty of 4.5% and an average metallurgical gold recovery of 80%. 8. The stope optimizer algorithm evaluated the resources based on a gold equivalent grade which incorporates the silver grade estimate and assumes a silver price of $US23/oz and metallurgical silver recovery of 45%. 9. Average bulk density values in the mineralized domains were assigned to the T2 (2.955 T/m 3 ), T3 (2.638 T/m 3 ), T4 (2.618 T/m 3 ), Wild Cat, and 40 Fault (2.621 T/m 3 ), and 75 - 85 (2.617 T/m 3 ) domains. 10. Inverse Distance Squared interpolation method was used with a parent block size of 1.2 m x 2.4 m x 2.4 m. 11. The Mineral Resource results are presented in - situ. Calculations used metric units (metres, tonnes, g/t). The number of tonnes is rounded to the nearest thousand. Any discrepancies in the totals are due to rounding effects. 12. Neither Osisko Development nor the Micon QPs are aware of any known environmental, permitting, legal, title - related, taxation, socio - political, marketing or other relevant issue that could materially affect the mineral resource estimate other than disclosed in the Technical Report.

Osisko Development Corp. 25.2.12 Mineral Resource Grade Sensitivity Analysis Table 25 . 3 shows the cut - off grade sensitivity analysis of gold and silver for the 2024 MRE . The reader should be cautioned that the figures provided in Table 25 . 3 should not be interpreted as a mineral resource statement . The reported quantities and grade estimates at different cut - off grades are presented for the sole purpose of demonstrating the sensitivity of the mineral resource model for gold to the selection of a reporting cut - off grade . Micon’s QP has reviewed the MRE cut - off grades used in the sensitivity analysis, and it is the opinion of the QP that they meet the test for reasonable prospects of eventual economic extraction at varying prices of gold or other underlying parameters used to calculate the cut - off grade . Table 25.3 Gold Grade Sensitivity Analysis at Different Cut - Off Grades 193 Tintic Project April 25, 2024 ~ Au Price @ COG AuEq oz AuEq g/T AG oz AG g/T AU oz AU g/T COG Tonnes Classification 170,985 12.48 628,563 45.87 166,338 12.14 2.00 426,210 Measured + Indicated 168,810 13.34 610,382 48.24 164,297 12.98 2.25 393,582 166,715 14.16 590,666 50.18 162,348 13.79 2.50 366,130 164,787 14.88 572,631 51.71 160,553 14.50 2.75 344,413 162,831 15.62 555,740 53.31 158,722 15.23 3.00 324,251 161,276 16.33 541,350 54.83 157,273 15.93 3.25 307,112 ~$2,100 159,603 17.06 525,681 56.19 155,716 16.64 3.50 291,005 ~$2,000 157,708 17.90 510,470 57.94 153,934 17.47 3.75 274,040 ~$1,900 156,010 18.58 495,091 58.95 152,350 18.14 4.00 261,219 ~$1,800 154,159 19.37 480,968 60.43 150,604 18.92 4.25 247,549 153,782 19.56 478,078 60.80 150,248 19.11 4.32 244,590 ~$1,700 152,734 20.03 469,058 61.52 149,266 19.58 4.50 237,143 ~$1,600 151,156 20.75 457,428 62.80 147,774 20.29 4.75 226,567 ~$1,500 149,987 21.47 447,646 64.07 146,677 20.99 5.00 217,327 ~$1,450 148,801 22.22 436,296 65.16 145,575 21.74 5.25 208,263 ~$1,400 147,032 23.03 422,504 66.19 143,909 22.55 5.50 198,538 145,466 23.78 412,467 67.43 142,416 23.28 5.75 190,247 144,144 24.52 403,074 68.57 141,164 24.01 6.00 182,842 142,117 25.52 389,880 70.02 139,235 25.01 6.25 173,188 140,550 26.34 380,902 71.39 137,734 25.81 6.50 165,955 139,599 27.31 374,280 73.21 136,832 26.76 6.75 159,018 138,207 28.10 365,663 74.34 135,503 27.55 7.00 152,986 86,977 4.79 561,011 30.88 82,830 4.56 2.00 565,158 Inferred 82,529 5.12 525,360 32.61 78,645 4.88 2.25 501,077 77,645 5.51 485,528 34.46 74,056 5.26 2.50 438,189

Osisko Development Corp. ~ Au Price @ COG AuEq oz AuEq g/T AG oz AG g/T AU oz AU g/T COG Tonnes Classification 73,042 5.90 451,119 36.46 69,707 5.63 2.75 384,864 69,162 6.27 423,112 38.38 66,034 5.99 3.00 342,880 65,928 6.60 399,562 39.98 62,974 6.30 3.25 310,856 ~$2,100 62,549 6.96 376,306 41.84 59,767 6.65 3.50 279,722 ~$2,000 58,868 7.39 352,865 44.28 56,260 7.06 3.75 247,838 ~$1,900 55,904 7.76 333,578 46.31 53,438 7.42 4.00 224,039 ~$1,800 53,379 8.10 318,207 48.26 51,026 7.74 4.25 205,085 52,895 8.16 314,678 48.55 50,569 7.80 4.32 201,603 ~$1,700 51,262 8.39 304,803 49.90 49,009 8.02 4.50 190,002 ~$1,600 49,181 8.71 291,971 51.73 47,022 8.33 4.75 175,561 ~$1,500 47,381 8.99 279,718 53.08 45,313 8.60 5.00 163,894 ~$1,450 45,508 9.28 267,379 54.53 43,531 8.88 5.25 152,515 ~$1,400 43,625 9.57 254,818 55.92 41,742 9.16 5.50 141,728 42,000 9.84 244,126 57.21 40,196 9.42 5.75 132,718 40,255 10.14 233,028 58.70 38,532 9.71 6.00 123,472 38,480 10.46 219,939 59.80 36,854 10.02 6.25 114,401 36,815 10.79 206,087 60.43 35,291 10.35 6.50 106,080 35,310 11.11 194,185 61.10 33,874 10.66 6.75 98,845 33,747 11.44 182,579 61.91 32,397 10.99 7.00 91,725 194 Tintic Project April 25, 2024 Table supplied by Osisko Development. 25.3 R ISKS AND O PPORTUNITIES All mineral resource projects have a degree of uncertainty or risk associated with them which can be due to several factors which can be technical, environmental, permitting, legal, title, taxation, socio - economic, marketing, political, among others in nature . All mineral resource projects also present their own opportunities . Table 25 . 4 outlines some of the Trixie project risks, their potential impact and possible ways of mitigation . Table 25 . 4 also outlines some of the Trixie projects opportunities and potential benefits .

Osisko Development Corp. Table 25.4 Risks and Opportunities at the Trixie Project 195 Tintic Project April 25, 2024 Possible Risk Mitigation Description and Potential Impact Risk Develop grade control procedures that will allow the collection and analysis of extra grade control samples prior to mining an area. Poor grade forecasting and reconciliation. Local grade continuity It is recommended to develop a procedure of collecting density measurements spatially throughout the deposit at regular intervals and implement their use in future mineralization models. Misrepresentation of the in - situ tonnes, which also affects the in - situ metal content estimate. Local density variability Continue infill drilling to upgrade mineral inventory to Measured and Indicated Category. If geologic interpretation and assumptions (geometry and continuity) used are inaccurate, then there is a potential lack of gold grade or continuity. Geologic Interpretation. Conduct drilling and underground surveys to validate void locations and document intersected workings and refine void management plan. If technical knowledge of the historic mine infrastructure is incomplete, then this deficiency could lead to local inaccuracies of the mineral resources and potential safety exposures Void Locations. Conduct additional metallurgical tests. Recovery might be lower than what is currently being assumed. Metallurgical recoveries are based on limited testwork. Refine recruitment and retention planning and/or make use of consultants. Technical work quality will be impacted and/or delayed. Difficulty in attracting experienced professionals. Incorporate more comprehensive geotechnical data from drilling. Conduct additional geotechnical assessment and analysis. Mining methods and dimensions selected might be different than what is currently being assumed . Conceptual mine plans and stoping layouts are based on limited geotechnical testwork. Potential Benefit Explanation Opportunities Adding resources increases the economic value of the mining project. Potential to identify additional prospects and resources. Surface and underground exploration drilling. Lower capital and operating costs. Additional metallurgical testwork can be performed to determine if recovery can be improved through ore sorting, flotation or cyanidation. Potential improvement in metallurgical recoveries. Improved mining productivity and lower costs. Geotechnical analysis may determine mining methods and dimensions can be improved. Potential improvement in mining assumptions. Table supplied by Osisko Development.

Osisko Development Corp. 25.4 C ONCLUSIONS With its purchase of TCM in May, 2022 , Osisko Development has acquired a major portion of the historical East Tintic Mining District in Utah . The east Tintic district has been a prolific mining district throughout most of its history with several past producers located within the boundaries of Osisko Development’s Tintic Project . The exploration, compilation and development work on the Trixie deposit conducted by Osisko Development since the initial MRE dated January 2023 , has resulted in a better understanding of the geology and mineralization . Based upon the work, Osisko Development has been able to provide an update to the mineral resource estimate for the Trixie deposit, with additional high priority target areas along strike to the north and at depth below historical areas at 756 and Survey Vein . Micon QPs have reviewed and validated the programs conducted by Osisko Development which are the basis for the 2024 mineral resource estimate, as well as validating the mineral resource itself . It is Micon’s QPs opinion that the exploration programs, which are the basis of the mineral resource estimate, and the mineral resource estimate itself have both been conducted according to industry best practices as outlined by the CIM . Therefore, Micon’s QPs believe that the 2024 mineral resource estimate can be used as the basis for further exploration and development work, and to expand the mineral resources . 196 Tintic Project April 25, 2024

Osisko Development Corp. 1. RECOMMENDATIONS 2. E XPLORATION B UDGET AND O THER E XPENDITURES The budgets presented in Table 26 . 1 and Table 26 . 2 summarize the estimated costs for completing the recommended drilling and exploration program described below . The budget is a cost estimate and guideline to complete the work . The budget is divided into a two - phase approach, with the second phase contingent on the successful completion of the first . Table 26.1 Tintic Project, Recommended Budget for Further Work, Phase 1 (USD) 197 Tintic Project April 25, 2024 Total (USD) Quantity Cost/ft (approx.) All included Type of Activity $4,500,000 15,000 ft $300/ft Trixie exploration drilling (756, T2 North, 75 - 85/Survey) $900,000 2,400 ft $375/ft Trixie exploration development $680,000 1,700 $400/ft Trixie porphyry exploration drilling $10,000,000 40,000 ft. $250/ft Regional drilling (Eureka Standard, North Lily, Big Hill) $2,400,000 40,000 $60/sample Assays $1,500,000 Surface geochemical surveys, surface and underground sampling and mapping, GIS compilation $1,000,000 Operational and environmental permits and licenses $1,500,000 Test stoping $200,000 Concept mine engineering and geotechnical update $250,000 Metallurgical test work $22,680,000 Property wide activities, subtotal $2,268,000 Contingency (~10%) $25,948,000 Total Phase 1 Table provided by Osisko Development. Table 26.2 Tintic Project, Recommended Budget for Further Work, Phase 2 (US$) Total (USD) Quantity Cost/ft (approx.) All included Type of Activity $5,200,000 20,000 ft. $260/ft. Additional infill and exploration drilling on existing resource $5,200,000 20,000 ft. $260/ft Additional regional drilling on CRD targets $200,000 Updated MRE $1,000,000 Completion of an internal scoping study for engineering $18,750,000 7,500 ft. $2500/ft Underground development for exploration $30,350,000 Subtotal Phase 2 $3,035,000 Contingency (~10%) $33,385,000 Total Phase 2 $59,333,000 Total Phase 1 and 2 Table provided by Osisko Development.

Osisko Development Corp. It is the opinion of the Micon QPs that all of the recommended work is warranted and that only the amount of exploration drilling on new targets needs to be finalized . Micon and its QPs appreciate that the nature of the programs and expenditures may change as the further studies are undertaken, and that the final expenditures and results may not be the same as originally proposed . The underground development for exploration is contingent upon successful drilling results from surface and existing access underground . The Micon QPs are of the opinion that Osisko Development’s recommended work program and proposed expenditures are appropriate and well thought out . The Micon QPs believe that the proposed budget reasonably reflects the type and amount of the activities required to advance the Trixie deposit . 2. F URTHER R ECOMMENDATIONS Based on the results of the MRE reported herein Micon’s QPs recommend further exploration and development of Trixie deposit . It is recommended that Osisko Development continues with underground exploration drilling at Trixie in the areas north of T 2 and T 4 at the 625 Level, down dip of 756 , and down plunge of 75 - 85 to the presumed location of the Survey Vein and Sioux Ajax Fault . In addition to exploration at Trixie, it is recommended that Osisko Development continue its exploration program on the other mineral targets on the Tintic Property, with continued surface mapping and sampling, data compilation and surface drilling of regional high sulphidation, CRD and porphyry targets . In summary, the following work program is recommended : 1. Exploration Work : a) Conduct an additional approximately 4 , 500 m ( 15 , 000 ft . ) of underground diamond drilling for exploration and delineation at Trixie, with focus on 756 , South Survey, T 2 North and infill drilling . b) Conduct additional exploration drilling for a copper - gold - moly porphyry at depth below Trixie . c) Commence surface drilling of regional targets to potentially add further mineral resources in secondary deposits . Focus on Eureka Standard and North Lily, and porphyry targets around the Big Hill area . Each target should have a phase 1 of 10 , 000 m of surface drilling to adequately test the mineral potential . d) Continue generative work within the greater Tintic Project, including geophysical interpretation, historic data compilation, and geologic modelling of CRD targets at Tintic Standard and Burgin . 2. Metallurgical Testwork: a) Leaching tests to optimize conditions in terms of precious metal recovery, capital costs and operating costs. b) Comparative testwork and techno - economic study to compare heap, VAT and agitation leaching technologies. 198 Tintic Project April 25, 2024

Osisko Development Corp. c) Geochemical characterization testwork on representative feed and residue samples. d) Appropriate additional comminution testing, depending on the most likely process flowsheet. e) Characterization and leaching behavior testwork on sample of 75 - 85 material to de - risk processing variability of this structure. f) Variability testwork. 3. Internal Scoping Study : a) Complete independent metallurgical testwork at the Trixie test mine . Conduct variability testwork and separate recoverability testwork for each zone . If the zones exhibit notable or significant differences in recoveries, incorporate those into an updated resource model . b) Complete further geotechnical work . c) Identify further permitting considerations and potential environmental studies for the Project . d) Continue with further community engagement and social license management . e) Undertake further detailed economic analysis, based upon engineering and metallurgical trade - off studies . 199 Tintic Project April 25, 2024

Osisko Development Corp. 27.0 DATE AND SIGNITURE PAGE The independent Qualified Persons for this report are as follows: MICON INTERNATIONAL LIMITED 200 Tintic Project April 25, 2024 “William J. Lewis” {signed and sealed as of the report date} William J. Lewis, P.Geo. Senior Geologist Report Date: April 25, 2024. Effective Date: March 14, 2024. “Alan J. San Martin” {signed as of the report date} Ing. Alan J. San Martin, MAusIMM (CP) Mineral Resource Specialist Report Date: April 25, 2024. Effective Date: March 14, 2024. “Richard Gowans” {signed and sealed as of the report date} Richard M. Gowans, P.Eng. Principal Metallurgist Report Date: April 25, 2024. Effective Date: March 14, 2024.

Osisko Development Corp. 1. REFERENCES 2. G ENERAL P UBLICATION AND R EPORT R EFERENCES Allen, T . L . , ( 2012 ), “Mafic Alkaline Magmatism in the East Tintic Mountains, West - Central Utah : Implications for a Late Oligocene Transition from Subduction to Extension . ” Provo, UT, Brigham Young University, M . S . thesis, 55 p . , https : //scholarsarchive . byu . edu/etd/ 2938 / . Allmendinger, R . W . , and Jordan, T . E . , ( 1981 ), “Mesozoic evolution, hinterland of the Sevier orogenic belt” . Geology, vol . 9 , no . 7 , pp . 308 – 313 . https : //doi . org/ 10 . 1130 / 0091 - 7613 ( 1981 ) 9 < 308 : MEHOTS> 2 . 0 . CO ; 2 . Applied Petrologic Services and Research, ( 2020 ), “Petrologic Studies of Drill Core & Subsurface Rock Chip from the Trixie Precious Metal Mine, Utah USA . ” Report APSAR 123001 prepared for Tintic Consolidated Metals, 36 p . Banks, Paul, ( 2015 ), An Update on harmonization of 2014 CIM Definition Standards, CIM Magazine, Vol . 10 , No . 3 , May, 2015 , pp 44 to 46 . 41 p . Banks, Paul, ( 2015 ), Implementation of 2014 CIM Definition Standards, CIM Magazine, Vol . 10 , No . 5 , August, 2015 , pp 32 to 34 . Cohen, J . F . , ( 2011 ), Compositional Variations in Hydrothermal White Mica and Chlorite from Wall - Rock Alteration at the Ann - Mason Porphyry Copper Deposit, Nevada . Journal of Chemical Information and Modeling vol . 53 . Jolette, C . , ( 2022 ) Laboratory Audit – Burgin Mine, internal report conducted for Osisko Development Corp . by Qualitica Consulting Inc . , 41 p . John, D . A . , Vikre, P . G . , du Bray, E . A . , Blakely, R . J . , Fey, D . L . , Rockwell, B . W . , Mauk, J . L . , Anderson, E . D . , and Graybeal, F . T . , ( 2018 ), “Descriptive models for epithermal gold - silver deposits . ” U . S . Geological Survey Scientific Investigations Report 2010 – 5070 – Q, 247 p . , https : //doi . org/ 10 . 3133 /sir 20105070 Q . Kappes, Cassiday & Associates, (July, 2022 ), Trixie Project, T 2 Soil Sample, Report of Metallurgical Test Work Prepared for Tintic Consolidated Metals LLC, 127 p . Kappes, Cassiday & Associates, (October, 2022 ), Trixie Project, T 4 Soil Sample, Report of Metallurgical Test Work Prepared for Tintic Consolidated Metals LLC, 98 p . Krahulec, K . , and Briggs, D . F . , ( 2006 ), “History, Geology, and Production of the Tintic Mining District, Juab, Utah, and Tooele Counties, Utah . ” in Bon . , R . L . , Gloyn, R . W . , and Park, G . M . , eds . Mining Districts of Utah, Geological Association of Utah Publication, no . 32 , pp . 121 – 50 . Krahulec, K . , ( 1996 ), “Geology and Geochemistry of the SWT Copper System, Tintic Mining District, Juab County, Utah . ” Geology and Ore Deposits of the American Cordillera : Field Trip Guidebook Compendium : April 10 - 13 , 1995 Reno/Sparks, Nevada : pp 62 to 78 . 201 Tintic Project April 25, 2024

Osisko Development Corp. Keith, J . D . , Dallmeyer, R . D . , Kim . , C - S . , and Kowallis, B . J . , ( 1989 ), “A Re - evaluation of the volcanic history and mineral potential of the central East Tintic Mountains, Utah . ” Utah Geological and Mineral Survey Open File Report 166 , 86 p . Hedenquist, J . W . and Henley, R . W . , ( 1985 ), “Hydrothermal eruptions in the Waiotapu geothermal system, New Zealand : their origin, associated breccias, and relation to precious metal mineralization” Economic Geology, vol . 80 , pp . 1640 – 1668 . Laughlin, A . W . , Lovering, T . S . , and Mauger, R . L . , ( 1969 ), “Age of Some Tertiary Igneous Rocks from the East Tintic District, Utah . ” Economic Geology, vol . 64 , no . 8 , pp . 915 to 918 , https : //doi . org/ 10 . 2113 /gsecongeo . 64 . 8 . 915 . Lindgren, W . & G . F . Loughlin, ( 1919 ), Geology and Ore Deposits of the Tintic Mining District, Utah . 323 . Leveille, R . A . , ( 2021 ), “Volcanic Stratigraphy, Instructions, and Targets, Tintic District, Utah . ” Report prepared for Tintic Consolidated Metals . 8 p . Lewis, W . J . , San Martin, A . J . and Gowans, R . , ( 2023 ), NI 43 - 101 Technical Report, Initial Mineral Resource Estimate for the Trixie Deposit, Tintic Project, Utah, United States of America, for Osisko Development Corp . with a report date of January 27 , 2023 and an effective date of January 10 , 2023 , 279 p . Lovering, T . S . , Morris, H . T . , Wagner, H . V . & Stringham, B . F . , ( 1960 ), Alteration Map of the East Tintic District, Utah . Lovering, T. S., (1949), Rock Alteration as a Guide to Ore — East Tintic District, Utah. Econ. Geol. Publ. Co. doi:10.5382/mono.01. McKean, A . P . , ( 2011 ), “Volcanic stratigraphy and a kinematic analysis of NE - trending faults of Allens Ranch 7 . 5 ' quadrangle, Utah County, Utah . ” Provo, UT, Brigham Young University, M . S . thesis, 95 p . , https : //scholarsarchive . byu . edu/etd/ 2410 / . Moore, D.K., (1993), “Oligocene East Tintic volcanic Field, Utah – geology and petrogenesis.” Provo, UT, Brigham Young University, M.S. thesis, 64 p. Moore, D . K . , Keith, J . D . , Christiansen, E . H . , Kim, C . S . , Tingey, D . G . , Nelson, S . T . , and Flamm, D . S . , ( 2007 ), “Petrogenesis of the Oligocene East Tintic volcanic field, Utah . ” in Willis, G . C . , Hylland, M . D . , Clark, D . L . , and Chidsey, T . C . , Jr . , eds . Central Utah – Diverse geology of a Dynamic Landscape, Geological Association of Utah Publication, no . 36 , pp . 163 - 180 . Morris, H . T . , ( 1956 ), United States Geological Survey . Geologic Map and Section of the Tintic Junction Quadrangle, Juab, Tooele and Utah Counties, Utah . Map . 1 : 24 000 . Bulletin 1142 - L, Plate I . Reston, VA : U.S. Department of the Interior. Morris, H., T. (1964), “Geology of the Eureka Quadrangle Utah and Juab Counties, Utah.” Contributions to Economic Geology, Geological Survey Bulletin 1142 - K. U.S. Department of the Interior. 202 Tintic Project April 25, 2024

Osisko Development Corp. Morris, H . , T . ( 1964 ), “Geology of the Tintic Junction Quadrangle Tooele, Juab, and Utah Counties, Utah . ” Contributions to Economic Geology, Geological Survey Bulletin 1142 - L . Department of the Interior . Morris, H . T . , ( 1964 ), United States Geological Survey . Geologic Map and Section of the Eureka Quadrangle, Juab and Utah Counties, Utah . Map . 1 : 24 000 . Bulletin 1142 - K, Plate I . Reston, VA : U . S . Department of the Interior . Morris, H. T., (1974), Geologic Map of the East Tintic Mining District, Utah and Juab Counties, Utah. Morris, H . T . , Lovering, T . S . , Mogensen, A . P . , Shepard, W . M . , Perry, L . I . , and Smith, S . M . , ( 1979 ), “General Geology and Mines of the East - Tintic Mining District, Utah and Juab Counties, Utah . ” U . S . Geological Survey Professional Paper, vol . 1024 . Morris, H . T . , Lovering, T . S . , Mogensen, A . P . , Shepard, W . M . , Perry, L . I . , and Smith, S . M . , ( 1979 ), United States Geological Survey . Geologic map of the East Tintic mining district, Utah and Juab Counties, Utah . Map . 1 : 9 600 . Professional Paper 1024 , Plate I . Reston, VA : U . S . Department of the Interior . Morris, H . T . , Lovering, T . S . , Mogensen, A . P . , Shepard, W . M . , Perry, L . I . , and Smith, S . M . , ( 1979 ), United States Geological Survey . Geologic sections of the East Tintic mining district, Utah and Juab Counties, Utah . Map . 1 : 9 600 . Professional Paper 1024 , Plate II . Reston, VA : U . S . Department of the Interior . Prince, J . , ( 2024 ) Summary of 2023 Regional Exploration, East Tintic District, Utah . Osisko Development internal report, 68 p . Rockwell, B . W . , McDougal, R . R . , Gent, C . A . , ( 2005 ), Remote sensing for environmental site screening and watershed evaluation in Utah Mine lands : East Tintic mountains, Oquirrh mountains, and Tushar mountains . USHS Scientific Investigations Report 2004 - 5241 . SRK Consulting (U.S.)., (2021) “NI 43 - 101 Technical Report: Mineral Project Exploration Information, Tintic Project, Utah, U.S.A.” Prepared for Ivanhoe Electric, A.M. Deiss, QP, 158 p. Sillitoe, R.H., (2006), “Exploration Potential of the Tintic District.” Report prepared for Chief Consolidated Mining Company, 12 p. Tintic Consolidated Metals . , ( 2022 ), Technical Report on the Tintic Project : East Tintic Mining District : Utah County, Utah, USA . Draft NI - 43 - 101 prepared for Osisko Development Corporation, T . A . Henricksen, QP . 197 p . Utah Geological Survey and New Mexico Geochronology Research Laboratory . , ( 2007 ), “ 40 Ar/ 39 Ar Geochronology Results for the Furner Ridge and Tintic Mountain Quadrangles, Utah . ” Utah Geological Survey Open File Report 505 , 26 p . http : //geology . utah . gov/online/ofr/ofr - 505 . pdf . Utah Geological Survey and Nevada Isotope Geochronology Laboratory . , ( 2009 ), “ 40 Ar/ 39 Ar Geochronology Results for Tintic Mountain and Champlin Peak Quadrangles, Utah . ” Utah Geological Survey Open Field Report 558 , 17 p . http : //geology . utah . gov/online/ofr/ofr - 558 . pdf . 203 Tintic Project April 25, 2024

Osisko Development Corp. Yonkee, W. A., and Weil, A.B., (2015), "Tectonic evolution of the Sevier and Laramide belts within the North American Cordillera orogenic system." Earth - Science Reviews, vol. 150, pp. 531 - 593. 28.2 W EBSITE R EFERENCES Osisko Development Corporation website, (2023), https://osiskodev.com/news/ 204 Tintic Project April 25, 2024

Osisko Development Corp. 29.0 CERTIFICATES OF QUALIFIED PERSONS (AUTHORS) 205 Tintic Project April 25, 2024

Osisko Development Corp. CERTIFICATE OF AUTHOR William J. Lewis, P.Geo. As the co - author of this report for Osisko Development Corp . entitled “NI 43 - 101 Technical Report, Mineral Resource Estimate for the Trixie Deposit, Tintic Project, Utah, USA” dated April 25 , 2024 , with an effective date of March 14 , 2024 , I, William J . Lewis do hereby certify that : 1. I am employed as a Principal Geologist by, and carried out this assignment for, Micon International Limited, Suite 601 , 90 Eglinton Avenue East, Toronto, Ontario M 4 P 2 Y 3 , tel . ( 416 ) 362 - 5135 , e - mail wlewis@micon - international . com . 2. This certificate applies to the Technical Report titled “NI 43 - 101 Technical Report, Mineral Resource Estimate for the Trixie Deposit, Tintic Project, Utah, USA” dated April 25, 2024, with an effective date of March 14, 2024. 3. I hold the following academic qualifications: B.Sc. (Geology) University of British Columbia 1985. 4. I am a registered Professional Geoscientist with the Association of Professional Engineers and Geoscientists of Manitoba (membership # 20480 ) ; as well, I am a member in good standing of several other technical associations and societies, including :  Association of Professional Engineers and Geoscientists of British Columbia (Membership # 20333).  Association of Professional Engineers, Geologists and Geophysicists of the Northwest Territories (Membership # 1450).  Professional Association of Geoscientists of Ontario (Membership # 1522). 5. I have worked as a geologist in the minerals industry for over 35 years. 6. I am familiar with NI 43 - 101 and, by reason of education, experience and professional registration, I fulfill the requirements of a Qualified Person as defined in NI 43 - 101 . My work experience includes 4 years as an exploration geologist looking for gold and base metal deposits, more than 11 years as a mine geologist in underground mines and 20 years as a surficial geologist and consulting geologist on precious and base metals and industrial minerals . 7. I have read NI 43 - 101 and this Technical Report has been prepared in compliance with the instrument. 8. I have visited the Tintic Project and the Trixie Deposit for three days between September 12 to September 16 , 2022 and again for two days between February 5 and February 8 , 2024 . 9. This is the second Technical Report I have written or co - authored for the mineral property that is the subject of this Technical Report . 10. I am independent Osisko Development Corp . and its subsidiaries according to the definition described in NI 43 - 101 and the Companion Policy 43 - 101 CP . 11. I am responsible for Section 1 (except for 1 . 7 ), 2 to 12 , 14 . 1 to 14 . 4 , 14 . 10 to 14 . 16 (except for 14 . 12 and 14 . 14 ) and 23 to 28 of this Technical Report with Sections 15 through 22 not applicable to this Technical Report . 12. As of the date of this certificate, to the best of my knowledge, information and belief, the Technical Report contains all scientific and technical information that is required to be disclosed to make this technical report not misleading . Report Dated this 25 day of April, 2024 with an effective date of March 14, 2024. “William J. Lewis” {signed and sealed as of the report date} William J. Lewis, B.Sc., P.Geo. Principal Geologist, Micon International Limited 206 Tintic Project April 25, 2024

Osisko Development Corp. CERTIFICATE OF AUTHOR Ing. Alan J. San Martin, MAusIMM (CP) As the co - author of this report for Osisko Development Corp . entitled “NI 43 - 101 Technical Report, Mineral Resource Estimate for the Trixie Deposit, Tintic Project, Utah, USA” dated April 25 , 2024 , with an effective date of March 14 , 2024 , I, Alan J . San Martin do hereby certify that : 1. I am employed as a Mineral Resource Specialist by Micon International Limited, Suite 601, 90 Eglinton Avenue East, Toronto, Ontario M4P 2Y3, tel. (416) 362 - 5135, e - mail asanmartin@micon - international.com . 2. I hold a bachelor’s degree in mining engineering (equivalent to B.Sc.) from the National University of Piura, Peru, 1999. 3. I am a member in good standing of the following professional entities:  The Australasian Institute of Mining and Metallurgy accredited Chartered Professional in Geology, Membership #301778.  Canadian Institute of Mining, Metallurgy and Petroleum, Member ID 151724.  Colegio de Ingenieros del Perú (CIP), Membership # 79184. 4. I have continuously worked in my profession since 1999. My experience includes mining exploration, mineral deposit modelling, mineral resource estimation and consulting services for the mineral industry. 5. I am familiar with NI 43 - 101 and form 43 - 101F1 and by reason of education, experience and professional registration with AusIMM(CP), I fulfill the requirements of a Qualified Person as defined in NI 43 - 101. 6. I have not visited the Tintic Project. 7. This is the second Technical Report I have written or co - authored for the mineral property that is the subject of this Technical Report. 8. As of the date of this certificate to the best of my knowledge, information and belief, the Technical Report contains all scientific and technical information that is required to be disclosed to make this report not misleading. 9. I have read NI 43 - 101 and this Technical Report has been prepared in compliance with the instrument. 10. I am independent Osisko Development Corp. and its subsidiaries according to the definition described in NI 43 - 101 and the Companion Policy 43 - 101 CP. 11. I am responsible for the preparation of Sections 14.5 to 14.9, 14.12 and 14.14 of this Technical Report with Sections 15 through 22 not applicable to this Technical Report. Report Dated this 25 day of April, 2024 with an effective date of March 14, 2024. “Alan J. San Martin” {signed as of the report date} Ing. Alan J. San Martin, MAusIMM (CP) Mineral Resource Specialist, Micon International Limited 207 Tintic Project April 25, 2024

Osisko Development Corp. CERTIFICATE OF AUTHOR Richard M. Gowans, P.Eng. As the co - author of this report for Osisko Development Corp . entitled “NI 43 - 101 Technical Report, Mineral Resource Estimate for the Trixie Deposit, Tintic Project, Utah, USA” dated April 25 , 2024 , with an effective date of March 14 , 2024 , I, Richard Gowans do hereby certify that : 1. I am employed as Principal Metallurgist by, and carried out this assignment for, Micon International Limited, Suite 601 , 90 Eglinton Avenue East, Toronto, Ontario M 4 P 2 Y 3 , tel . ( 416 ) 362 - 5135 , e - mail rgowans@micon - international . com . 2. I hold the following academic qualifications: B.Sc. (Hons) Minerals Engineering, The University of Birmingham, U.K. 1980. 3. I am a registered Professional Engineer of Ontario (membership number 90529389 ) ; as well, I am a member in good standing of the Canadian Institute of Mining, Metallurgy and Petroleum . 4. I am familiar with NI 43 - 101 and by reason of education, experience and professional registration, fulfill the requirements of a Qualified Person as defined in NI 43 - 101 . My work experience includes over 30 years of the management of technical studies and design of numerous metallurgical testwork programs and metallurgical processing plants . 5. I have read NI 43 - 101 and this Technical Report has been prepared in compliance with the instrument. 6. I have not visited the Tintic Project. 7. I have not participated in the preparation of a prior Technical Reports on the Tintic Project. 8. I am independent of Osisko Development Corp. and its related entities, as defined in Section 1.5 of NI 43 - 101. 9. I am responsible for Section 1 . 7 and 13 of this Technical Report with Sections 15 through 22 not applicable to this Technical Report . 10. As of the date of this certificate, to the best of my knowledge, information and belief, the Technical Report contains all scientific and technical information that is required to be disclosed to make this technical report not misleading . Report Dated this 25 day of April, 2024 with an effective date of March 14, 2024. “Richard Gowans” {signed and sealed as of the report date} Richard Gowans P.Eng. Principal Metallurgist, Micon International Limited 208 Tintic Project April 25, 2024

Osisko Development Corp. APPENDIX 1 GLOSSARY OF MINING AND OTHER RELATED TERMS 209 Tintic Project April 25, 2024

Osisko Development Corp. The following is a glossary of general mining terms that may be used in this Technical Report. 210 Tintic Project April 25, 2024 A Ag Assay Symbol for the element silver. A chemical test performed on a sample of ores or minerals to determine the amount of valuable metals contained. Symbol for the element gold. Au B Base metal Bulk mining Any non - precious metal (e . g . copper, lead, zinc, nickel, etc . ) . Any large - scale, mechanized method of mining involving many thousands of tonnes of ore being brought to surface per day . A large sample of mineralized rock, frequently hundreds of tonnes, selected in such a manner as to be representative of the potential orebody being sampled . The sample is usually used to determine metallurgical characteristics . Precious metal formed into bars or ingots . A secondary metal or mineral product recovered in the milling process . Bulk sample Bullion By - product C Channel sample A sample composed of pieces of vein or mineral deposit that have been cut out of a small trench or channel, usually about 10 cm wide and 2 cm deep . A method of sampling a rock exposure whereby a regular series of small chips of rock is broken off along a line across the face . The CIM Definition Standards on Mineral Resources and Mineral Reserves adopted by CIM Council from time to time . The most recent update adopted by the CIM Council is effective as of November 27 , 2010 . The Canadian Institute of Mining, Metallurgy and Petroleum . A fine, powdery product of the milling process containing a high percentage of valuable metal. A geological term used to describe the line or plane along which two different rock formations or rock types meet. The long cylindrical piece of rock, about an inch in diameter, brought to surface by diamond drilling. One or several pieces of whole or split parts of core selected as a sample for analysis or assay. Chip sample CIM Standards CIM Concentrate Contact Core Core sample

Osisko Development Corp. Cross - cut 211 Tintic Project April 25, 2024 A horizontal opening driven from a shaft and (or near) right angles to the strike of a vein or other orebody . The term is also used to signify that a drill hole is crossing the mineralization at or near right angles to it . Symbol for the element copper . The lowest grade of mineralized rock that qualifies as ore grade in a given deposit, and is also used as the lowest grade below which the mineralized rock currently cannot be profitably exploited . Cut - off grades vary between deposits depending upon the amenability of ore to gold extraction and upon costs of production . Cu Cut - off grade D Deposit An informal term for an accumulation of mineralization or other valuable earth material of any origin. Development drilling Drilling to establish accurate estimates of mineral resources or reserves usually in an operating mine or advanced project. Dilution Rock that is, by necessity, removed along with the ore in the mining process, subsequently lowering the grade of the ore . The angle at which a vein, structure or rock bed is inclined from the horizontal as measured at right angles to the strike . A semi refined alloy containing sufficient precious metal to make recovery profitable . Crude precious metal bars, ingots or comparable masses produced at a mine which are then sold or shipped to a refinery for further processing . Dip Doré E Epithermal Hydrothermal mineral deposit formed within one kilometre of the earth’s surface, in the temperature range of 50 to 200 Σ C. Epithermal deposit A mineral deposit consisting of veins and replacement bodies, usually in volcanic or sedimentary rocks, containing precious metals or, more rarely, base metals. Exploration Prospecting, sampling, mapping, diamond drilling and other work involved in searching for ore. F Face Fault The end of a drift, cross - cut or stope in which work is taking place. A break in the Earth's crust caused by tectonic forces which have moved the rock on one side with respect to the other. Any bending or wrinkling of rock strata. The rock on the underside of a vein or mineralized structure or deposit. Fold Footwall

Osisko Development Corp. Fracture 212 Tintic Project April 25, 2024 A break in the rock, the opening of which allows mineral - bearing solutions to enter . A "cross - fracture" is a minor break extending at more - or - less right angles to the direction of the principal fractures . G g/t g/t Grade Abbreviation for gram(s) per metric tonne . Abbreviation for gram(s) per tonne . Term used to indicate the concentration of an economically desirable mineral or element in its host rock as a function of its relative mass . With gold, this term may be expressed as grams per tonne (g/t) or ounces per tonne (opt) . One gram is equal to 0 . 0321507 troy ounces . Gram H Hanging wall High grade The rock on the upper side of a vein or mineral deposit. Rich mineralization or ore. As a verb, it refers to selective mining of the best ore in a deposit. The rock surrounding an ore deposit. Processes associated with heated or superheated water, especially mineralization or alteration. Host rock Hydrothermal I Indicated Mineral Resource An Indicated Mineral Resource is that part of a Mineral Resource for which quantity, grade or quality, densities, shape and physical characteristics are estimated with sufficient confidence to allow the application of Modifying Factors in sufficient detail to support mine planning and evaluation of the economic viability of the deposit . Geological evidence is derived from adequately detailed and reliable exploration, sampling and testing and is sufficient to assume geological and grade or quality continuity between points of observation . An Indicated Mineral Resource has a lower level of confidence than that applying to a Measured Mineral Resource and may only be converted to a Probable Mineral Reserve . Inferred Mineral Resource An Inferred Mineral Resource is that part of a Mineral Resource for which quantity and grade or quality are estimated on the basis of limited geological evidence and sampling . Geological evidence is sufficient to imply but not verify geological and grade or quality continuity . An Inferred Mineral Resource has a lower level of confidence than that applying to an Indicated Mineral Resource and must not be converted to a Mineral Reserve . It is reasonably expected that the majority of Inferred

Osisko Development Corp. Mineral Resources could be upgraded to Indicated Mineral Resources with continued exploration.” A body of igneous rock formed by the consolidation of magma intruded into other 213 Tintic Project April 25, 2024 Intrusive K km Abbreviation for kilometre(s). One kilometre is equal to 0.62 miles. L Leaching The separation, selective removal or dissolving - out of soluble constituents from a rock or ore body by the natural actions of percolating solutions . The horizontal openings on a working horizon in a mine ; it is customary to work mines from a shaft, establishing levels at regular intervals, generally about 50 m or more apart . Level M m Abbreviation for metre(s) . One metre is equal to 3 . 28 feet . Measured Mineral Resource A Measured Mineral Resource is that part of a Mineral Resource for which quantity, grade or quality, densities, shape, and physical characteristics are estimated with confidence sufficient to allow the application of Modifying Factors to support detailed mine planning and final evaluation of the economic viability of the deposit . Geological evidence is derived from detailed and reliable exploration, sampling and testing and is sufficient to confirm geological and grade or quality continuity between points of observation . A Measured Mineral Resource has a higher level of confidence than that applying to either an Indicated Mineral Resource or an Inferred Mineral Resource . It may be converted to a Proven Mineral Reserve or to a Probable Mineral Reserve . Metallurgy The science and art of separating metals and metallic minerals from their ores by mechanical and chemical processes . Affected by physical, chemical, and structural processes imposed by depth in the earth’s crust . A plant in which ore is treated and metals are recovered or prepared for smelting ; also a revolving drum used for the grinding of ores in preparation for treatment . An excavation beneath the surface of the ground from which mineral matter of value is extracted . A naturally occurring homogeneous substance having definite physical properties and chemical composition and, if formed under favourable conditions, a definite crystal form . Metamorphic Mill Mine Mineral Mineral Concession

Osisko Development Corp. That portion of public mineral lands which a party has staked or marked out in accordance with federal or state mining laws to acquire the right to explore for and exploit the minerals under the surface . The process or processes by which mineral or minerals are introduced into a rock, resulting in a valuable or potentially valuable deposit . 214 Tintic Project April 25, 2024 Mineralization Mineral Resource • A Mineral Resource is a concentration or occurrence of solid material of economic interest in or on the Earth’s crust in such form, grade or quality and quantity that there are reasonable prospects for eventual economic extraction . The location, quantity, grade or quality, continuity and other geological characteristics of a Mineral Resource are known, estimated or interpreted from specific geological evidence and knowledge, including sampling . Mineral Resources are sub - divided, in order of increasing geological confidence, into Inferred, Indicated and Measured categories . An Inferred Mineral Resource has a lower level of confidence than that applied to an Indicated Mineral Resource . An Indicated Mineral Resource has a higher level of confidence than an Inferred Mineral Resource but has a lower level of confidence than a Measured Mineral Resource . The term mineral resource used in this report is a Canadian mining term as defined in accordance with NI 43 - 101 – Standards of Disclosure for Mineral Projects under the guidelines set out in the Canadian Institute of Mining, Metallurgy and Petroleum (the CIM), Standards on Mineral Resource and Mineral Reserves Definitions and guidelines adopted by the CIM Council on December 11 , 2005 , updated as of November 27 , 2010 and more recently updated as of May 10 , 2014 (the CIM Standards) . N Net Smelter Return A payment made by a producer of metals based on the value of the gross metal production from the property, less deduction of certain limited costs including smelting, refining, transportation and insurance costs . NI 43 - 101 National Instrument 43 - 101 is a national instrument for the Standards of Disclosure for Mineral Projects within Canada . The Instrument is a codified set of rules and guidelines for reporting and displaying information related to mineral properties owned by, or explored by, companies which report these results on stock exchanges within Canada . This includes foreign - owned mining entities who trade on stock exchanges overseen by the Canadian Securities Administrators (CSA), even if they only trade on Over the Counter (OTC) derivatives or other instrumented securities . The NI 43 - 101 rules and guidelines were updated as of June 30 , 2011 .

Osisko Development Corp. O Open Pit/Cut 215 Tintic Project April 25, 2024 A form of mining operation designed to extract minerals that lie near the surface . Waste or overburden is first removed, and the mineral is broken and loaded for processing . The mining of metalliferous ores by surface - mining methods is commonly designated as open - pit mining as distinguished from strip mining of coal and the quarrying of other non - metallic materials, such as limestone and building stone . Osisko Development Osisko Development Corp., including, unless the context otherwise requires, the Company's subsidiaries. Outcrop An exposure of rock or mineral deposit that can be seen on surface that is, not covered by soil or water. A chemical reaction caused by exposure to oxygen that result in a change in the chemical composition of a mineral. A measure of weight in gold and other precious metals, correctly troy ounces, which weigh 31.2 grams as distinct from an imperial ounce which weigh 28.4 grams. Abbreviation for ounce. Oxidation Ounce oz P Plant A building or group of buildings in which a process or function is carried out ; at a mine site it will include warehouses, hoisting equipment, compressors, maintenance shops, offices and the mill or concentrator . A common, pale - bronze or brass - yellow, mineral composed of iron and sulphur . Pyrite has a brilliant metallic luster and has been mistaken for gold . Pyrite is the most wide - spread and abundant of the sulphide minerals and occurs in all kinds of rocks . Pyrite Q Qualified Person Conforms to that definition under NI 43 - 101 for an individual : (a) to be an engineer or geoscientist with a university degree, or equivalent accreditation, in an area of geoscience, or engineering, related to mineral exploration or mining ; (b) has at least five years' experience in mineral exploration, mine development or operation or mineral project assessment, or any combination of these, that is relevant to his or her professional degree or area of practice ; (c) to have experience relevant to the subject matter of the mineral project and the technical report ; (d) is in good standing with a professional association ; and (e) in the case of a professional association in a foreign jurisdiction, has a membership designation that (i) requires attainment of a position of responsibility in their profession that requires the exercise of independent judgement ; and (ii) requires (A . ) a favourable confidential peer evaluation of the individual’s character, professional judgement, experience, and ethical fitness ; or (B . ) a recommendation for membership by at least two peers, and demonstrated prominence or expertise in the field of mineral exploration or mining .

Osisko Development Corp. R Reclamation 216 Tintic Project April 25, 2024 The restoration of a site after mining or exploration activity is completed. S Shoot A concentration of mineral values ; that part of a vein or zone carrying values of ore grade . The direction, or bearing from true north, of a vein or rock formation measure on a horizontal surface . A narrow vein or irregular filament of a mineral or minerals traversing a rock mass . A group of minerals which contains sulphur and other metallic elements such as copper and zinc . Gold and silver are usually associated with sulphide enrichment in mineral deposits . Strike Stringer Sulphides T Tonne A metric ton of 1,000 kilograms (2,205 pounds). V Vein A fissure, fault or crack in a rock filled by minerals that have travelled upwards from some deep source. W Wall rocks Rock units on either side of an orebody. The hanging wall and footwall rocks of a mineral deposit or orebody. Unmineralized, or sometimes mineralized, rock that is not minable at a profit. May be a shaft, quarry, level, open - cut, open pit, or stope etc. Usually noted in the plural. Waste Working(s) Z Zone An area of distinct mineralization.

Osisko Development Corp. APPENDIX 2 TINTIC PROJECT PROPERTIES AND MINERAL RIGHTS 217 Tintic Project April 25, 2024

Osisko Development Corp. Properties and Mineral Rights Patented Claims Leased (Okelberry): 218 Tintic Project April 25, 2024 A Portion of Sections Range Township PatentNo. SurveyNo. Name 29 R2W T10S 884211 5774 CROWN POINT EXTENSION NO.1 28: NE¼ R2W T10S 884211 5774 CROWN POINT EXTENSION NO.2 28: NE¼ R2W T10S 884211 5774 CROWN POINT EXTENSION NO.3 27: NW¼ 28: NE¼ R2W T10S 884211 5774 MAPLE LEAF #1 21: SE¼ 28: NE¼ R2W T10S 884211 5774 MAPLE LEAF #2 21: SE¼ 28: NE¼ R2W T10S 884211 5774 MAPLE LEAF 29 R2W T10S 3025 6025 FRANK 28: NW¼ R2W T10S 852823 6402 NASHVILLE NO.2 21: SE¼ 28: NE¼ R2W T10S 879792 6402 COYOTE NO.6 27: NW¼ 28: NE¼ R2W T10S 852823 6402 NASHVILLE NO.3 21: SE¼ R2W T10S 852823 6402 COYOTE NO.1 21: SE¼ 28: NE¼ R2W T10S 852823 6402 COYOTE NO.2 21: SE¼ R2W T10S 852823 6402 COYOTE NO.3 8, 9, 16, 17 R2W T10S 852823 6402 COYOTE NO.10 8 R2W T10S 852823 6402 COYOTE FRACTION 17 R2W T10S 852823 6402 COYOTE NO.11 9 R2W T10S 852823 6402 NASHVILLE NO.1 9 R2W T10S 852823 6402 NASHVILLE NO.4 8, 9 R2W T10S 852823 6402 HILL TOP NO.2 29 R2W T10S 989402 6779 MAUD 29 R2W T10S 989402 6779 UNO 29 R2W T10S 989402 6779 NEVADA EXTENSION Trixie Claims: A Portion of Sections Range Township Patent No. Survey No. Name 28: NE¼ R2W T10S 1006490 6766 Cameo #27 28: NE¼ R2W T10S 959091 6574 Cedar 28: NE¼ R2W T10S 959091 6574 Cedar No. 1 27: NW¼ R2W T10S 993922 6737 Cedar No. 4

Osisko Development Corp. Burgin Claims: 219 Tintic Project April 25, 2024 A Portion of Sections Range Township PatentNo. SurveyNo. Name 15: SE¼ 22: NE¼ R2W T10S 915159 6560 Christmas 15: SE¼ 22: NE¼ R2W T10S 915159 6560 Christmas No. 1 15: SE¼ R2W T10S 915159 6560 Detective No. 5 15: SE¼ R2W T10S 915159 6560 Detective No. 7 15: SE¼ 22: NE¼ R2W T10S 915159 6560 Sunny Side No. 1 15: SE¼ 22: NE¼ R2W T10S 1038307 6784 Climax No. 1 15: SE¼ R2W T10S 1038307 6784 Climax No. 2 11: SW¼ 14: NW¼ 15: SE¼ R2W T10S 1038307 6784 Eastern No. 2 14: NW¼, SW¼ 22: NE¼ R2W T10S 945099 6752 Zenith No. 1 14: NW¼ 22: NE¼ R2W T10S 945099 6752 Zenith No. 19 14: NW¼ R2W T10S 1038307 6784 Eastern No. 10 11: SW¼ 14: NW¼ R2W T10S 1038307 6784 Eastern No. 11 14: NW¼ 15: SE¼ 22: NE¼ R2W T10S 1038307 6784 Eastern No. 3 A Portion of Sections Range Township Patent No. Survey No. Name 28: NE¼ 21: SE¼ 28: NE¼ R2W T10S 397059 6091 East Point #5 21: SE¼ 28: NE¼ R2W T10S 1108693 7138 Rose 27: NW¼ 28: NE¼ R2W T10S 214588 6073 Trixy 28: NW¼ R2W T10S 214588 6073 TRUMP 21: SE¼ 28: NE¼ R2W T10S 925953 6456 Vern No. 2 27: NW¼ 28: NE¼ R2W T10S 1006490 6766 White Rose No. Four 21: SE¼ R2W T10S 1006490 6766 White Rose No. 5 Amended 21: SE¼ 28: NE¼ R2W T10S 1006490 6766 White Rose No. Six 21: SE¼ R2W T10S 1006490 6766 White Rose No. Seven

Osisko Development Corp. 14: NW¼ SW¼ R2W T10S 1038307 6784 Eastern No. 4 14: NW¼, SW¼ R2W T10S 1038307 6784 Eastern No. 7 14: NW¼ R2W T10S 1038307 6784 Eastern No. 8 11: SW¼ 14: NW¼ R2W T10S 1038307 6784 Eastern No. 9 14: NW¼ R2W T10S 1039439 6785 Eastern No. 12 11: SW¼ 14: NW¼ R2W T10S 1039439 6785 Eastern No. 13 11: SW¼ 14: NW¼ R2W T10S 1039439 6785 Eastern No. 14 14: NW¼ R2W T10S 1039439 6785 Eastern No. 15 14: NW¼ R2W T10S 1039439 6785 Eastern No. 17 14: NW¼, SW¼ R2W T10S 1042410 6801 Inez No. 3 15: SE¼ R2W T10S 971242 6466 Wonderer No. X6 15: SE¼ R2W T10S 971242 6466 Wonderer No. X5 11: SW¼ 15: SE¼ R2W T10S 971242 6466 Wonderer AMND 220 Tintic Project April 25, 2024 Unpatented Claims Owned: Quadrant Township Range Section Claim Type Legacy Lead File Number Legacy Serial Number Lead File Number Serial Number Name 11S 2W 15 LODE CLAIM UMC446009 UMC446009 UT101615071 UT101615071 ANNA 1 11S 2W 15 LODE CLAIM UMC446009 UMC446010 UT101615072 UT101615072 ANNA 2 11S 2W 15 LODE CLAIM UMC446009 UMC446011 UT101615073 UT101615073 ANNA 3 11S 2W 15 LODE CLAIM UMC446009 UMC446012 UT101615074 UT101615074 ANNA 4 11S 2W 15 LODE CLAIM UMC446009 UMC446013 UT101615075 UT101615075 ANNA 5 11S 2W 15 LODE CLAIM UMC446009 UMC446014 UT101615076 UT101615076 ANNA 6 11S 2W 15 LODE CLAIM UMC446009 UMC446015 UT101615077 UT101615077 ANNA 7 11S 2W 15 LODE CLAIM UMC446009 UMC446016 UT101615078 UT101615078 ANNA 8 11S 2W 15 LODE CLAIM UMC446009 UMC446017 UT101615079 UT101615079 ANNA 9 11S 2W 15 LODE CLAIM UMC446009 UMC446018 UT101615080 UT101615080 ANNA 10

Osisko Development Corp. Quadrant Township Range Section Claim Type Legacy Lead File Number Legacy Serial Number Lead File Number Serial Number Name 11S 2W 15 LODE CLAIM UMC446009 UMC446019 UT101615081 UT101615081 ANNA 11 11S 2W 15 LODE CLAIM UMC446009 UMC446020 UT101615082 UT101615082 ANNA 12 11S 2W 15 LODE CLAIM UMC446009 UMC446021 UT101615083 UT101615083 ANNA 13 11S 2W 15 LODE CLAIM UMC446009 UMC446022 UT101615084 UT101615084 ANNA 14 11S 2W 15 LODE CLAIM UMC446009 UMC446023 UT101615085 UT101615085 ANNA 15 11S 2W 15 LODE CLAIM UMC446009 UMC446024 UT101615086 UT101615086 ANNA 16 11S 2W 15 LODE CLAIM UMC446009 UMC446025 UT101615087 UT101615087 ANNA 17 11S 2W 15 LODE CLAIM UMC446009 UMC446026 UT101615088 UT101615088 ANNA 18 11S 2W 15 LODE CLAIM UMC446009 UMC446027 UT101615089 UT101615089 ANNA 19 11S 2W 15 LODE CLAIM UMC446009 UMC446028 UT101615090 UT101615090 ANNA 20 11S 2W 15 LODE CLAIM UMC446009 UMC446029 UT101615841 UT101615841 ANNA 21 11S 2W 15 LODE CLAIM UMC446009 UMC446030 UT101615842 UT101615842 ANNA 22 11S 2W 15 LODE CLAIM UMC446009 UMC446031 UT101615843 UT101615843 ANNA 23 11S 2W 15 LODE CLAIM UMC446009 UMC446032 UT101615844 UT101615844 ANNA 24 11S 2W 15 LODE CLAIM UMC446009 UMC446033 UT101615845 UT101615845 ANNA 25 11S 2W 15 LODE CLAIM UMC446009 UMC446034 UT101615846 UT101615846 ANNA 26 11S 2W 15 LODE CLAIM UMC446009 UMC446035 UT101615847 UT101615847 ANNA 27 LODE CLAIM UMC446009 UMC446036 UT101615848 UT101615848 CLOE NO 1 11S 2W 22 LODE CLAIM UMC446009 UMC446037 UT101615849 UT101615849 CLOE NO 2 11S 2W 22 LODE CLAIM UMC446009 UMC446038 UT101615850 UT101615850 CLOE NO 3 11S 2W 22 LODE CLAIM UMC446009 UMC446039 UT101615851 UT101615851 CLOE NO 4 11S 2W 22 LODE CLAIM UMC446009 UMC446040 UT101615852 UT101615852 CLOE NO 5 11S 2W 15 LODE CLAIM UMC446009 UMC446041 UT101615853 UT101615853 LAUREN NO 1 221 Tintic Project April 25, 2024

Osisko Development Corp. Quadrant Township Range Section Claim Type Legacy Lead File Number Legacy Serial Number Lead File Number Serial Number Name 11S 2W 15 LODE CLAIM UMC446009 UMC446042 UT101615854 UT101615854 LAUREN NO 2 11S 2W 15 LODE CLAIM UMC446009 UMC446043 UT101615855 UT101615855 LAUREN NO 3 11S 2W 15 LODE CLAIM UMC446009 UMC446044 UT101615856 UT101615856 LAUREN NO 4 11S 2W 15 LODE CLAIM UMC446009 UMC446045 UT101615857 UT101615857 LAUREN NO 5 11S 2W 15 LODE CLAIM UMC446009 UMC446046 UT101615858 UT101615858 LAUREN NO 6 11S 2W 15 LODE CLAIM UMC446009 UMC446047 UT101616463 UT101616463 LAUREN NO 7 11S 2W 15 LODE CLAIM UMC446009 UMC446048 UT101616464 UT101616464 LAUREN NO 8 11S 2W 15 LODE CLAIM UMC446009 UMC446049 UT101616465 UT101616465 LAUREN NO 9 11S 2W 15 LODE CLAIM UMC446009 UMC446050 UT101616466 UT101616466 SANDY B NO 1 11S 2W 15 LODE CLAIM UMC446009 UMC446051 UT101616467 UT101616467 SANDY B NO 2 11S 2W 15 LODE CLAIM UMC446009 UMC446052 UT101616468 UT101616468 SANDY B NO 3 11S 2W 15 LODE CLAIM UMC446009 UMC446053 UT101616469 UT101616469 SANDY B NO 4 11S 2W 15 LODE CLAIM UMC446009 UMC446054 UT101616470 UT101616470 SANDY B NO 5 NE NW 11S 2W 22 LODE CLAIM UMC445639 UMC445639 UT101857326 UT101857326 SANDY B NO 10 NE NW 11S 2W 22 LODE CLAIM UMC445639 UMC445640 UT101857327 UT101857327 SANDY B NO 11 NE NW 11S 2W 22 LODE CLAIM UMC445639 UMC445641 UT101857328 UT101857328 SANDY B NO 12 NE NW 11S 2W 22 LODE CLAIM UMC445639 UMC445642 UT101857329 UT101857329 SANDY B NO 13 NE NW SE SW 11S 2W 22 LODE CLAIM UMC445639 UMC445643 UT101857330 UT101857330 SANDY B NO 14 NE 11S 2W 22 LODE CLAIM UMC445639 UMC445644 UT101857331 UT101857331 SANDY B NO 19 NE 11S 2W 22 LODE CLAIM UMC445639 UMC445645 UT101857332 UT101857332 SANDY B NO 20 NE 11S 2W 22 LODE CLAIM UMC445639 UMC445646 UT101857333 UT101857333 SANDY B NO 21 NE 11S 2W 22 LODE CLAIM UMC445639 UMC445647 UT101857334 UT101857334 SANDY B NO 22 222 Tintic Project April 25, 2024

Osisko Development Corp. Quadrant Township Range Section Claim Type Legacy Lead File Number Legacy Serial Number Lead File Number Serial Number Name NE SE 11S 2W 22 LODE CLAIM UMC445639 UMC445648 UT101857335 UT101857335 SANDY B NO 23 SW 11S 2W 11 LODE CLAIM UMC446346 UMC446346 UT101718478 UT101718478 TRACY KT NO 1 SW 11S 2W 11 LODE CLAIM UMC446346 UMC446347 UT101718479 UT101718479 TRACY KT NO 2 SW 11S 2W 11 LODE CLAIM UMC446346 UMC446348 UT101718480 UT101718480 TRACY KT NO 3 SW 11S 2W 11 LODE CLAIM UMC446346 UMC446349 UT101718481 UT101718481 TRACY KT NO 4 SW 11S 2W 11 LODE CLAIM UMC446346 UMC446350 UT101718482 UT101718482 TRACY KT NO 5 SW 11S 2W 11 LODE CLAIM UMC446346 UMC446351 UT101718483 UT101718483 TRACY KT NO 6 SW 11S 2W 11 LODE CLAIM UMC446346 UMC446352 UT101718484 UT101718484 TRACY KT NO 7 SW 11S 2W 11 LODE CLAIM UMC446346 UMC446353 UT101718485 UT101718485 TRACY KT NO 8 SW 11S 2W 11 LODE CLAIM UMC446346 UMC446354 UT101719330 UT101719330 TRACY KT NO 9 SW 11S 2W 11 LODE CLAIM UMC446346 UMC446355 UT101719331 UT101719331 TRACY KT NO 10 SW 11S 2W 22 LODE CLAIM UMC445649 UMC445649 UT101858489 UT101858489 SANDY B NO 6 SW 11S 2W 22 LODE CLAIM UMC445649 UMC445650 UT101858490 UT101858490 SANDY B NO 7 SW 11S 2W 22 LODE CLAIM UMC445649 UMC445651 UT101858491 UT101858491 SANDY B NO 8 SW 11S 2W 22 LODE CLAIM UMC445649 UMC445652 UT101858492 UT101858492 SANDY B NO 9 SE SW 11S 2W 22 LODE CLAIM UMC445649 UMC445653 UT101858493 UT101858493 SANDY B NO 15 SE SW 11S 2W 22 LODE CLAIM UMC445649 UMC445654 UT101858494 UT101858494 SANDY B NO 16 SE SW 11S 2W 22 LODE CLAIM UMC445649 UMC445655 UT101858495 UT101858495 SANDY B NO 17 SE SW 11S 2W 22 LODE CLAIM UMC445649 UMC445656 UT101858496 UT101858496 SANDY B NO 18 SE 11S 2W 22 LODE CLAIM UMC445649 UMC445657 UT101858497 UT101858497 SANDY B NO 24 SE 11S 2W 22 LODE CLAIM UMC445649 UMC445658 UT101858498 UT101858498 SANDY B NO 25 SE 11S 2W 22 LODE CLAIM UMC445649 UMC445659 UT101858499 UT101858499 SANDY B NO 26 SE 11S 2W 22 LODE CLAIM UMC445649 UMC445660 UT101858500 UT101858500 SANDY B NO 27 223 Tintic Project April 25, 2024

Osisko Development Corp. Quadrant Township Range Section Claim Type Legacy Lead File Number Legacy Serial Number Lead File Number Serial Number Name SW 11S 2W 22 LODE CLAIM UMC445649 UMC445661 UT101858501 UT101858501 CLOE NO 6 SW 11S 2W 22 LODE CLAIM UMC445649 UMC445662 UT101858502 UT101858502 CLOE NO 7 SW 11S 2W 22 LODE CLAIM UMC445649 UMC445663 UT101858503 UT101858503 CLOE NO 8 SW 11S 2W 22 LODE CLAIM UMC445649 UMC445664 UT101858504 UT101858504 CLOE NO 9 NW 10S 2W 29 LODE CLAIM UMC399883 UMC399886 UT101363382 UT101363382 CCM 4 NW SW 10S 2W 29 10S 2W 20 LODE CLAIM UMC399883 UMC399887 UT101363383 UT101363383 CCM 5 NW SW 10S 2W 29 10S 2W 20 LODE CLAIM UMC399883 UMC399888 UT101363384 UT101363384 CCM 6 SW 10S 2W 20 LODE CLAIM UMC399883 UMC399889 UT101363385 UT101363385 CCM 7 NE SE 10S 2W 19 LODE CLAIM UMC399883 UMC399890 UT101363386 UT101363386 CCM 8 SE SW 10S 2W 20 LODE CLAIM UMC399883 UMC399891 UT101364242 UT101364242 CCM 9 SW 10S 2W 20 LODE CLAIM UMC399883 UMC399892 UT101364243 UT101364243 CCM 10 NW 10S 2W 20 LODE CLAIM UMC399883 UMC399893 UT101364244 UT101364244 CCM 11 NW 10S 2W 20 LODE CLAIM UMC399883 UMC399894 UT101364245 UT101364245 CCM 12 SE 10S 2W 17 LODE CLAIM UMC403414 UMC403434 UT101650658 UT101650658 CCM 43 SE SW 10S 2W 17 LODE CLAIM UMC403414 UMC403435 UT101650659 UT101650659 CCM 44 SE SW 10S 2W 17 LODE CLAIM UMC403414 UMC403436 UT101650660 UT101650660 CCM 45 SE 10S 2W 17 LODE CLAIM UMC403414 UMC403437 UT101651635 UT101651635 CCM 46 SE SW 10S 2W 17 LODE CLAIM UMC403515 UMC403515 UT101678678 UT101678678 DAN SULLIVAN SW 10S 2W 17 LODE CLAIM UMC403515 UMC403516 UT101678679 UT101678679 DAN SULLIVAN # 1 NW 10S 2W 22 LODE CLAIM UMC399883 UMC399896 UT101364247 UT101364247 CCM 14 SW 10S 2W 21 LODE CLAIM UMC399883 UMC399895 UT101364246 UT101364246 CCM 13 SE 10S 2W 15 LODE CLAIM UMC399883 UMC399897 UT101364248 UT101364248 CCM 15 NW 10S 2W 10 LODE CLAIM UMC399883 UMC399898 UT101364249 UT101364249 CCM 16 224 Tintic Project April 25, 2024

Osisko Development Corp. Quadrant Township Range Section Claim Type Legacy Lead File Number Legacy Serial Number Lead File Number Serial Number Name SW NW 10S 2W 3 10S 2W 10 LODE CLAIM UMC399883 UMC399899 UT101364250 UT101364250 CCM 17 SE 10S 2W 3 LODE CLAIM UMC399883 UMC399900 UT101364251 UT101364251 CCM 18 NE SE 10S 2W 3 LODE CLAIM UMC399883 UMC399901 UT101364252 UT101364252 CCM 19 NE 10S 2W 3 LODE CLAIM UMC399883 UMC399902 UT101364253 UT101364253 CCM 20 SE SW 9S 2W 34 LODE CLAIM UMC399883 UMC399903 UT101364254 UT101364254 CCM 21 10S 2W 28 10S 2W 33 LODE CLAIM UT105790757 UT105790757 TRIXIE EAST NO 1 10S 2W 27 10S 2W 28 10S 2W 33 LODE CLAIM UT105790757 UT105790758 TRIXIE EAST NO 2 10S 2W 27 10S2W 28 LODE CLAIM UT105790757 UT105790759 TRIXIE EAST NO 3 10S 2W 27 10S 2W 28 LODE CLAIM UT105790757 UT105790760 TRIXIE EAST NO 4 225 Tintic Project April 25, 2024 Patented Claims Owned: Section Range Township County SurveyNo. State Of Utah TaxPropertyNo. Name 33 2W 10S UTAH, JUAB 6847 62661 ACORN AMENDED 18 2W 10S JUAB 312 21897 ALABAMA 20 2W 10S UTAH 5685 19300 ALFALFA 11 3W JUAB JUAB 4287 44793 ALLA 32 2W 10S JUAB 6052 63074 ALMA (Card - 657) 7, 13 2W, 3W 10S JUAB 4536 43515, 43514 ALOHA 7, 12 2W, 3W 10S JUAB 105 43512 ALPHA MILL 9 2W 10S UTAH 6775 40335, 21785 ALPINE 30 2W 10S JUAB 4550 01588 AMELIA RIVES ADDITION 30 2W 10S JUAB 4550 01588 AMELIE RIVES 32 2W 10S JUAB 6052 63076 AMERICA(Card - 657) 20 2W 10S UTAH 5698 19298 AMERICAN 18,19 2W 10S JUAB 240 21942 AMERICAN STAR 31, 2 2W 10S, 11S JUAB 4360 40193 ANA LARA 19 2W 10S UTAH 3220 40423 ANACONDA 17,18 2W 10S UTAH, JUAB 3519 21858 ANACONDA LODE

Osisko Development Corp. Section Range Township County SurveyNo. State Of Utah TaxPropertyNo. Name 16 2W 10S UTAH 6433 19284 ANDYAMENDED 20 2W 10S UTAH 5854 19291 ANGLE 30, 25 2W, 3W 10S JUAB 4535 40090 ANITA 20 2W 10S UTAH 5714 19295 ARROW 1, 2, 35, 36 3W 9S, 10S UTAH 264 21889 ANNA MARGARET 24 3W 10S JUAB 4320 60745 ANNA NO.2 17, 20 2W 10S UTAH 4628 40406 ANNIE HURLEY 30 2W 10S JUAB 3241 4365 ANNIE MAY GUNDRY 31 2W 10S JUAB 5999 39951 ANTELOPE 31 2W 10S JUAB 6014 40180 ANTELOPE FRACTION 31 2W 10S JUAB 5999 40184 ANTELOPE NO.2 30 2W 10S JUAB 3332 40079 ARDATH 30 2W 10S JUAB 290 4362 ARGENTA 17 2W 10S UTAH 4623 40408 ARGENTUM 21 2W 10S UTAH 6439 19283 ATAIR 17 2W 10S UTAH 5736 40398 AUG BESTELMEYER 16 2W 10S UTAH 5795 4390 AUGUST GULCH 16, 17 2W 10S UTAH 5736 40399 AUGUST NO.1 13, 18 2W, 3W 10S JUAB 4536 43540 AURORA 13, 18 2W, 3W 10S JUAB 4536 43539 AURORA NO.1 16 2W 10S UTAH 4282 19316 AURORIA 25, 30 2W, 3W 10S JUAB 4523 40104 AVELANCHE 1, 2, 6, 7 2W, 3W 10S UTAH 6024 21886 BALTIC 9 2W 10S UTAH 6000 21844 BALTIMORE NO.3 27 2W 10S UTAH 6757 21792 BANK NOTE NO.12 27 2W 10S UTAH 6757 60563 BANK NOTE NO.13 27 2W 10S UTAH 6757 60564 BANK NOTE NO.14 27 2W 10S UTAH 6757 60565 BANK NOTE NO.15 27 2W 10S UTAH 6757 60566 BANK NOTE NO.16 13 3W 10S JUAB 4026 21953 BAPTA 7 2W 10S JUAB 4536 43525 BATTERY B 16, 17 2W 10S UTAH 5734 4394 BAVARIA GIRL 18, 19 2W 10S JUAB 196A 24821 BEECHER 17 2W 10S UTAH 6975 40334 BELVA 4, 5 2W 10S UTAH 6402 21837 BEND 5 2W 10S UTAH 6430 21883 BEND NO.1 5 2W 10S UTAH 6430 21834 BEND NO.2 5 2W 10S UTAH 6430 60397 BEND NO.3 226 Tintic Project April 25, 2024

Osisko Development Corp. Section Range Township County SurveyNo. State Of Utah TaxPropertyNo. Name 8, 9 2W 10S UTAH 6402 60696 BERTHA 20 2W 10S UTAH 3149 19336 BIG EASTERNMINE 28, 33 2W 10S UTAH 6462 19281 BIG SPRING 24 3W 10S JUAB 5081 21901 BILL MCKINLEY 20, 29 2W 10S UTAH 219 19342 BILL SHULER 30, 31 2W 10S JUAB 49 51905 BLACK DRAGON 31 2W 10S JUAB 79 33525 BLACK DRAGON LODE FIRST EXTENSION SOUTH CLAIMS 3 & 4 15, 22 2W 10S UTAH 6848 21752 BLAK EAGEL 15 2W 10S UTAH 6848 60366 BLAK EAGEL #1 30 2W 10S JUAB 101 40092 BLACK JACK 35, 2 3W 9S, 10S JUAB 3746 31174 BLACK ROCK 18, 19 2W 10S JUAB 124 62827 BLUE BELL 31 2W 10S JUAB 4360 40194 BLUE BIRD 8 2W 11S JUAB 3904 4398 BLUE BIRD EXTENSION 28 2W 10S UTAH 6847 62662 BLUE RIBBONAMENDED 28 2W 10S UTAH 6847 62663 BLUERIBBONAMENDED#1 28 2W 10S UTAH 6847 19260 BLUE RIBBON NO. 2 AMENDED 28 2W 10S UTAH 6847 62657 BLUE RIBBON NO. 3 AMENDED 2, 34 2W, 3W 9S, 10S UTAH 6582 21809 BLUFF 31 2W 10S JUAB 6666 40122 BOGDAN FRACTION AMENDED 31 2W 10S JUAB 6666 40119 BOGDAN NO.1 31 2W 10S JUAB 6666 40120 BOGDAN NO.2 31 2W 10S JUAB 6666 40121 BOGDAN NO.3 AMENDED 18 2W 10S JUAB 247 21957 BOOM MS 30 2W 10S JUAB 237 40316 BOSS TWEED 30 2W 10S JUAB 237 40317 BOSS TWEED EXTENSION 29, 32 2W 10S JUAB 6779 4368 BRAGO 30 2W 10S JUAB 274 40318 BRAZIL LODE 2ND. 24 3W 10S JUAB 307 40084 BRAZILIAN 31 2W 10S JUAB 86 101115 BROOKLYN 31 2W 10S JUAB 3783 51906 BROOKLYN NO.2 30 2W 10S UTAH, JUAB 4053 24800 BROWNIE 29, 30 2W 10S JUAB 5905 60818 BUDDER 13 3W 10S JUAB 76 21954 BULLION 16 2W 10S UTAH 6935 4345 BULLION FRACTION 32 2W 10S JUAB 6052 76395 BURGLAREXTENSION (Card - 657) 227 Tintic Project April 25, 2024

Osisko Development Corp. Section Range Township County SurveyNo. State Of Utah TaxPropertyNo. Name 5 2W 11S JUAB 4141 63111 BURGLER(Card - 113) 20 2W 10S UTAH 4420 19314 BUTTE 28,29 2W 10S UTAH 6847 62658 BUZZARD 35 3W 9S UTAH 265 21888 C.S.D. 30, 25 2W, 3W 10S UTAH 4180 35090 CADAVER 19, 24 2W, 3W 10S JUAB 187 25527 CAFFER EXTENSION 9 2W 10S UTAH 6438 40428 CALDWELL 29 2W 10S UTAH 342 40418 CALIFORNIA 28 2W 10S UTAH 6766 19268 CAMEO NO.27 27 2W 10S UTAH 6766 62680 CAMEO NO.33 27 2W 10S UTAH 6737 19269 CAMEO NO.34 25 3W 10S JUAB 250 CANE 20, 29 2W 10S UTAH, JUAB 4054 24799 CAPTAIN S. 29, 30 2W 10S UTAH, JUAB 56 40026 CARISA 29, 32 2W 10S JUAB 6847 63115 CARL 16 2W 10S UTAH 37 19329 CAROLINE 7, 12 3W 10S JUAB 4536 43510, 43511 CASCARA 20 2W 10S UTAH 5714 62729 CASTLE 16, 17 2W 10S UTAH 5734 64974 CATHARINA BESTELMEYER 28 2W 10S UTAH 6574 19276 CEDAR 27,28 2W 10S UTAH 6737 21795 CEDAR NO.5 AMENDED 9 2W 10S UTAH 6882 4348 CEDAR FRACTION 28 2W 10S UTAH 6574 62698 CEDAR NO.1 9 2W 10S UTAH 6436 4378 CEDAR NO.10 28 2W 10S UTAH 6574 62697 CEDAR NO.2 9 2W 10S UTAH 6000 60714 CEDAR NO.2 28 2W 10S UTAH 6574 62698 CEDAR NO.3 9 2W 10S UTAH 6000 60713 CEDAR NO.4 9 2W 10S UTAH 6737 19271 CEDAR NO.4 27, 28 2W 10S UTAH 7140 19255 CEDAR NO.6 18 2W 10S JUAB 6289 60756 CHIEF FRACTION 29 2W 9S UTAH 6484 21875 CHIEF NO. 9 29 2W 9S UTAH 6484 21876 CHIEF NO.10 29 2W 9S UTAH 6484 60260 CHIEF NO.4 29 2W 9S UTAH 6484 60264 CHIEF NO.5 29 2W 9S UTAH 6484 60265 CHIEF NO.6 29 2W 9S UTAH 6484 60266 CHIEF NO.7 29 2W 9S UTAH 6484 60267 CHIEF NO.8 228 Tintic Project April 25, 2024

Osisko Development Corp. Section Range Township County SurveyNo. State Of Utah TaxPropertyNo. Name 15, 22 2W 10S UTAH 6560 21812 CHRISTMAS 15, 22 2W 10S UTAH 6560 60616 CHRISTMAS NO.1 33 2W 9S UTAH 6633 21866 CHRISTMAS NO.1 33 2W 9S UTAH 6633 60217 CHRISTMAS NO.2 33 2W 9S UTAH 6633 60218 CHRISTMAS NO.3 27, 33, 34 2W 9S UTAH 6633 60220 CHRISTMAS NO.4 33 2W 9S UTAH 6633 21798 CHRISTMAS NO.5 33, 34 2W 9S UTAH 6633 60580 CHRISTMAS NO.6 34 2W 9S UTAH 6633 60581 CHRISTMAS NO.7 12, 13 3W 10S JUAB 3871 43551 CHURCH STREET [SIC] 2, 35 3W 10S JUAB 264 60761 CINCH 16 2W 10S UTAH 5795 66457 CLARA 16 2W 10S UTAH 6553 4373 CLARA NO.2 EXTENSION 16 2W 10S UTAH 5795 66459 CLARA NO.2 9,16 2W 10S UTAH 6438 40429 CLARK 21 2W 10S UTAH 6439 62706 CLIMAX 15, 22 2W 10S UTAH 6784 21783 CLIMAX NO.1 15 2W 10S UTAH 6784 60525 CLIMAX NO.2 18 2W 10S JUAB 4800 43541 CLIMAX PLACER 20 2W 10S UTAH 5714 62730 CLINTON 20 2W 10S UTAH 5714 62731 CLIPPER 29 2W 10S JUAB 6025 40043 CLOUD 13,18,19,24 3W 10S JUAB 186 63160 COFFER 30 2W 10S JUAB 293 1268 COLCONDA 7,12 2W 10S JUAB 4536 43522 COLD CANYON 20, 29 2W 10S UTAH 4420 19321 COLORADO 13 3W 10S JUAB 139 60747 COLORADO CHIEF 16 2W 10S UTAH 6433 62707 COMET AMENDED 24, 25 3W 10S JUAB 330 4387 COMING SUMMER 25 3W 10S JUAB 3338 4389 COMING SUMMER FRACTION 5 2W 11S JUAB 6699 4317 COMPROMISE 17 2W 10S UTAH, JUAB 6114 21841 COMSTOCK 15, 16 2W 10S UTAH 6204 21840 CONTACT 15, 16 2W 10S UTAH 3826 40414 CONTACT 17, 20 2W 10S UTAH 6516 40414 CONTACT 3, 34 2W 9S, 10S UTAH 6516 60638 CONTACT NO.1 27,34 2W 9S UTAH 6516 60639 CONTACT NO.2 27,34 2W 9S UTAH 6516 60640 CONTACT NO.3 27,34 2W 9S UTAH 6516 64948 CONTACT NO.5 31 2W 10S JUAB 83 51923 CONTEST MINE 229 Tintic Project April 25, 2024

Osisko Development Corp. Section Range Township County SurveyNo. State Of Utah TaxPropertyNo. Name 2 2W 10S UTAH 6583 60600 COPPER GLANCE EXTENSION #001 2 2W 10S UTAH 6583 60601 COPPER GLANCE EXTENSION #002 2 2W 10S UTAH 6583 60599 COPPER GLANCE #001 15, 16 2W 10S UTAH 6204 60704 COPPER QUEEN 15 2W 10S UTAH 6204 60705 COPPER QUEEN NO.2 15 2W 10S UTAH 6204 60706 COPPER QUEEN NO.3 15 2W 10S UTAH 6204 60707 COPPER QUEEN NO.4 29 2W 10S UTAH 4479 40412 CORDELIA ORTON 6 2W 11S JUAB 4171 40129 CORNUCOPIA 13 3W 10S JUAB 97 21952 CORNUCOPIA 7,18 2W 10S JUAB 4536 43528 CORPORAL 12 3W 10S JUAB 140 21934 COSMOPOLITE NO.2 6,7 2W 10S UTAH 6537 21869 COSSACK 8 2W 10S UTAH 6402 23531 COYOTE 16, 17 2W 10S UTAH 6402 66454 COYOTE NO.7 16 2W 10S UTAH 6402 66455 COYOTE NO.8 16, 17 2W 10S UTAH 6402 66456 COYOTE NO.9 2 2W 10S UTAH 6583 60602 CRESCENT #006 1,12 3W 10S UTAH 6024 60319 CROESUS 31 2W 10S JUAB 80 24755 CROSS DRAGON 20,29 2W 10S UTAH 5774 62837 CROWN POINT EXTENSION NO.4 20, 21, 28, 29 2W 10S UTAH 5774 62838 CROWN POINT EXTENSION NO.5 7,18 2W 10S JUAB 4536 43538 CURACOA 30, 31 2W 10S JUAB 334 24756 CYGNET 19, 20 2W 10S UTAH 3327 19330 CYRUS OLIVER 29 2W 10S JUAB 6090 319737 DAD 6 2W 11S JUAB 316 40130 DAISEY HAMILTON 30, 31 2W 10S JUAB 4519 62495 DAISY 30, 25 2W, 3W 10S JUAB 4179 40115 DAMIFICARE 12 3W 10S JUAB 6024 60750 DAN PATCH 30 2W 10S JUAB 320 51982 DANDY LODE 30 2W 10S JUAB 4565 40094 DANDY JIM 5, 32 2W 10S, 11S JUAB 6699 DAWSON NO.3 AMENDED 32 2W 10s JUAB 6699 4319 DAWSON NO.4 AMENDED 32 2W 10S JUAB 4136 34931 DECEIVER 19, 30 2W 10S JUAB 3491 51986 DECEMBER 2, 35 3W 9S, 10S JUAB 3746 31174 DENVER 9, 16 2W 10S UTAH 6402 4379 DESERT 16 2W 10S UTAH 6402 66449 DESERT FRACTION 230 Tintic Project April 25, 2024

Osisko Development Corp. Section Range Township County SurveyNo. State Of Utah TaxPropertyNo. Name 9 2W 10S UTAH 6448 4376 DESERT NO.002 9, 16 2W 10S UTAH 6448 64728 DESERT NO.003 9, 16 2W 10S UTAH 6448 64027 DESERT NO.004 9, 16 2W 10S UTAH 6402 66450 DESERT NO.005 17 2W 10S UTAH 6402 66451 DESERT NO.006 17 2W 10S UTAH 6402 66452 DESERT NO.007 9, 16 2W 10S UTAH 6448 64018 DESERT NO.008 16 2W 10S UTAH 6402 66453 DESERT NO.009 15 2W 10S UTAH 6560 60618 DETECTIVE NO.002 (AMENDED) 15 2W 10S UTAH 6560 60617 DETECTIVE NO.005 15 2W 10S UTAH 6560 21813 DETECTIVE NO.007 31 2W 10S JUAB 4519 51924 DEW DROP 9 2W 10S UTAH 6438 40430 DEWEY 9 2W 11S JUAB 7004 49883 DIMOND KING 9 2W 11S JUAB 7004 49883 DIMOND KING NO.1 9 2W 11S JUAB 7004 49883 DIMOND KING NO.2 5 2W 10S UTAH 6430 65546 DIVIDE 5 2W 10S UTAH 6430 60306 DIVIDE FRACTION 5 2W 10S UTAH 6430 60398 DIVIDE NO.001 7 2W 10S UTAH 6432 21878 DIVIDE NO.010 5 ,6, 7, 8 2W 10S UTAH 6432 60685 DIVIDE NO.011 6, 7 2W 10S UTAH 6432 60691 DIVIDE NO.012 6, 7 2W 10S UTAH 6432 60268 DIVIDE NO.013 6, 7 2W 10S UTAH 6432 60269 DIVIDE NO.014 6, 7 2W 10S UTAH 6432 60270 DIVIDE NO.015 5 2W 10S UTAH 6430 60307 DIVIDE NO.002 7 2W 10S UTAH, JUAB 6432 43520 DIVIDE NO.022 7, 8 2W 10S UTAH 6432 60693 DIVIDE NO.023 5 2W 10S UTAH 6432 60271 DIVIDE NO.003 5, 6 2W 10S UTAH 6432 21877 DIVIDE NO.004 5, 8 2W 10S UTAH 6432 60695 DIVIDE NO.006 5 2W 10S UTAH 6430 60399 DIVIDE NO.007 5, 8 2W 10S UTAH 6430 60400 DIVIDE NO.008 5, 6 2W 10S UTAH 6432 60272 DIVIDE NO.009 29 2W 10S JUAB 6025 DOMINON NO.1 24 3W 10S JUAB 311 60752 DONNELLY BOY 18, 19 2W 10S JUAB 5663 62828 DORA MINING 12 3W 10S UTAH, JUAB 6024 60320 DORIC 17 2W 10S UTAH 4758 40405 DOVE 231 Tintic Project April 25, 2024

Osisko Development Corp. Section Range Township County SurveyNo. State Of Utah TaxPropertyNo. Name 2, 35 3W 9S, 10S UTAH, JUAB 264 21903 DROP 19, 30 2W 10S JUAB 320 51981 DUDE LODE 4, 33 2W 9S, 10S UTAH 6516 60847 E. PINYON 3, 34 2W 9S, 10S UTAH 6516 60642 E. PINYON NO.10 27,34 2W 9S UTAH 6516 21816 E. PINYON NO.11 3, 34 2W 9S, 10S UTAH 6516 60632 E. PINYON NO.12 3, 34 2W 9S,10S UTAH 6516 60633 E. PINYON NO.14 27, 34 2W 9S UTAH 6516 60634 E. PINYON NO.15 4, 33 2W 9S, 10S UTAH 6516 60635 E. PINYON NO.2 33 2W 9S UTAH 6516 21871 E. PINYON NO.3 3, 4, 33, 34 2W 9S, 10S UTAH 6516 60636 E. PINYON NO.4 33, 34, 27 2W 9S UTAH 6516 21815 E. PINYON NO.5 3, 34 2W 9S, 10S UTAH 6516 60625 E. PINYON NO.6 3, 34 2W 9S, 10S UTAH 6516 60626 E. PINYON NO.8 27, 34 2W 9S UTAH 6516 65792 E. PINYON NO.9 21, 22 2W 10S UTAH 6767 62666 EAGEL 18 2W 10S JUAB 123 62829 EAGLE 4, 9 2W 10S UTAH 4126 60723 EAGLE LODE MINING CLAIM NO.1 20 2W 10S UTAH 3148 19337 EAST BOY MINE 11 2W 10S UTAH 6789 21774 EAST CONTACT NO.001 2, 11 2W 10S UTAH 6789 60493 EAST CONTACT NO.010 11 2W 10S UTAH 6789 60495 EAST CONTACT NO.012 2, 11 2W 10S UTAH 6789 60496 EAST CONTACT NO.013 11 2W 10S UTAH 6789 21773 EAST CONTACT NO.014 11 2W 10S UTAH 6789 60492 EAST CONTACT NO.015 2, 11 2W 10S UTAH 6789 60489 EAST CONTACT NO.016 11 2W 10S UTAH 6789 60490 EAST CONTACT NO.017 11 2W 10S UTAH 6789 60491 EAST CONTACT NO.018 11 2W 10S UTAH 6788 21777 EAST CONTACT NO.019 11 2W 10S UTAH 6789 21772 EAST CONTACT NO.002 11 2W 10S UTAH 6788 60509 EAST CONTACT NO.020 11 2W 10S UTAH 6788 60510 EAST CONTACT NO.021 11 2W 10S UTAH 6788 60511 EAST CONTACT NO.022 11 2W 10S UTAH 6788 65554 EAST CONTACT NO.023 11 2W 10S UTAH 6788 60512 EAST CONTACT NO.024 11 2W 10S UTAH 6790 21770 EAST CONTACT NO.025 11 2W 10S UTAH 6788 21776 EAST CONTACT NO.026 11 2W 10S UTAH 6788 60504 EAST CONTACT NO.027 11 2W 10S UTAH 6790 60470 EAST CONTACT NO.028 11 2W 10S UTAH 6788 60505 EAST CONTACT NO.029 232 Tintic Project April 25, 2024

Osisko Development Corp. Section Range Township County SurveyNo. State Of Utah TaxPropertyNo. Name 11 2W 10S UTAH 6789 60483 EAST CONTACT NO.003 11 2W 10S UTAH 6788 60506 EAST CONTACT NO.030 11 2W 10S UTAH 6789 60471 EAST CONTACT NO.031 11 2W 10S UTAH 6788 60507 EAST CONTACT NO.032 11 2W 10S UTAH 6788 60508 EAST CONTACT NO.033 11, 12 2W 10S UTAH 6790 60472 EAST CONTACT NO.034 11, 12 2W 10S UTAH 6788 21775 EAST CONTACT NO.035 11, 12 2W 10S UTAH 6788 60497 EAST CONTACT NO.036 14 2W 10S UTAH 6793 21766 EAST CONTACT NO.037 2, 11 2W 10S UTAH 6789 60484 EAST CONTACT NO.004 11, 14 2W 10S UTAH 6793 60450 EAST CONTACT NO.040 11, 14 2W 10S UTAH 6793 60451 EAST CONTACT NO.041 11, 14 2W 10S UTAH 6793 60452 EAST CONTACT NO.042 11, 14 2W 10S UTAH 6790 60474 EAST CONTACT NO.043 11, 14 2W 10S UTAH 6790 60476 EAST CONTACT NO.044 11 2W 10S UTAH 6790 21769 EAST CONTACT NO.045 11 2W 10S UTAH 6790 60465 EAST CONTACT NO.046 11, 14 2W 10S UTAH 6790 60466 EAST CONTACT NO.047 11, 14 2W 10S UTAH 6790 60467 EAST CONTACT NO.048 11, 14 2W 10S UTAH 6790 60468 EAST CONTACT NO.049 11 2W 10S UTAH 6789 60486 EAST CONTACT NO.005 11, 14 2W 10S UTAH 6790 21768 EAST CONTACT NO.050 11, 14 2W 10S UTAH 6790 60460 EAST CONTACT NO.051 11, 12, 13, 14 2W 10S UTAH 6790 60461 EAST CONTACT NO.052 14 2W 10S UTAH 6790 60462 EAST CONTACT NO.053 14 2W 10S UTAH 6790 60463 EAST CONTACT NO.054 14 2W 10S UTAH 6790 60464 EAST CONTACT NO.055 14 2W 10S UTAH 6790 21767 EAST CONTACT NO.056 14 2W 10S UTAH 6790 60454 EAST CONTACT NO.057 14 2W 10S UTAH 6790 60455 EAST CONTACT NO.058 2, 11 2W 10S UTAH 6789 60487 EAST CONTACT NO.059 11 2W 10S UTAH 6789 21771 EAST CONTACT NO.006 2, 11 2W 10S UTAH 6788 60498 EAST CONTACT NO.060 2, 11 2W 10S UTAH 6788 60499 EAST CONTACT NO.061 2, 11 2W 10S UTAH 6788 60500 EAST CONTACT NO.062 2, 11 2W 10S UTAH 6788 60501 EAST CONTACT NO.063 14 2W 10S UTAH 6793 60453 EAST CONTACT NO.066 14 2W 10S UTAH 6790 60456 EAST CONTACT NO.067 14 2W 10S UTAH 6790 60457 EAST CONTACT NO.068 14 2W 10S UTAH 6790 60458 EAST CONTACT NO.069 233 Tintic Project April 25, 2024

Osisko Development Corp. Section Range Township County SurveyNo. State Of Utah TaxPropertyNo. Name 2, 11 2W 10S UTAH 6789 60479 EAST CONTACT NO.007 13, 14 2W 10S UTAH 6790 60459 EAST CONTACT NO.070 11 2W 10S UTAH 6789 60481 EAST CONTACT NO.008 11 2W 10S UTAH 6789 60482 EAST CONTACT NO.009 11 2W 10S UTAH 6789 60494 EAST CONTACT NO.011 16 2W 10S UTAH 5740 19293 EAST FRACTION 17 2W 10S UTAH 6114 60709 EAST HUMBUG 21 2W 10S UTAH 6091 19287 EAST POINT NO.1 21 2W 10S UTAH 6091 62710 EAST POINT NO.2 21 2W 10S UTAH 6091 19286 EAST POINT NO.3 21 2W 10S UTAH 6091 62708 EAST POINT NO.4 21, 22 2W 10S UTAH 6091 62709 EAST POINT NO.5 30, 31 2W 10S JUAB 232 40081 EAST STAR 29, 30 2W 10S JUAB 4519 51908 EASTERN 14 2W 10S UTAH 6784 60526 EASTERN NO.010 11, 14 2W 10S UTAH 6784 60527 EASTERN NO.011 14 2W 10S UTAH 6785 35365 EASTERN NO.012 11, 14 2W 10S UTAH 6785 60516 EASTERN NO.013 11, 14 2W 10S UTAH 6785 60517 EASTERN NO.014 14 2W 10S UTAH 6785 60518 EASTERN NO.015 11, 14 2W 10S UTAH 6785 60519 EASTERN NO.016 14 2W 10S UTAH 6785 21780 EASTERN NO.017 11, 14 2W 10S UTAH 6785 60513 EASTERN NO.018 14 2W 10S UTAH 6785 60514 EASTERN NO.019 11, 14, 15 2W 10S UTAH 6784 60528 EASTERN NO.002 14 2W 10S UTAH 6785 60515 EASTERN NO.020 14, 15, 22 2W 10S UTAH 6784 60529 EASTERN NO.003 14 2W 10S UTAH 6784 21781 EASTERN NO.004 14, 22 2W 10S UTAH 6784 60520 EASTERN NO.005 14, 22, 23 2W 10S UTAH 6784 60521 EASTERN NO.006 14 2W 10S UTAH 6784 60522 EASTERN NO.007 14, 15 2W 10S UTAH 6784 60523 EASTERN NO.008 11, 14, 15 2W 10S UTAH 6784 60524 EASTERN NO.009 31 3W 10S JUAB 4029 31726 ECLIPSE 24 3W 10S JUAB 107 64831 ECLIPSE 31 3W 10S JUAB 4029 62964 ECLIPSE NO.2 19, 20, 29 2W 10S UTAH 218 19343 ED. STOKES 2, 11 3W 10S JUAB 4287 44793 EDGEWARD 35 3W 9S JUAB 265 60979 EIGHTH OF AUGUST 21, 28 2W 10S UTAH 6585 60597 ELEANOR 234 Tintic Project April 25, 2024

Osisko Development Corp. Section Range Township County SurveyNo. State Of Utah TaxPropertyNo. Name 21, 28 2W 10S UTAH 6595 19273 ELEANOR #2 21 2W 10S UTAH 6585 60598 ELEANORE NO.1 6 2W 10S UTAH 6534 12129 ELECTRIC 30 2W 10S JUAB 4019 40101 ELGIN AMENDED 31 2W 10S JUAB 84 18506 ELISE 31 2W 10S JUAB 222 20250 ELISE NO.2 17, 18 2W 10S UTAH, JUAB 6455 43552 ELLA 1, 36 3W 9S, 10S UTAH, JUAB 264 60336 ELLA 20 2W 10S UTAH 5687 73786 EMMA 24 3W 10S JUAB 309 40083 EMMA ABBOTT 17 2W 10S UTAH 6059 21843 ENDY 19, 20 2W 10S JUAB 326 40422 ENTERPRISE 2, 11 3W 10S JUAB 4287 44793 ERIE 24 3W 10S JUAB 305 4327 ERNANI 6 2W 11S JUAB 4360 40254 EUCHRE 24 3W 10S JUAB 39 60748 EUREKA MINING CLAIM 1 3W 10S UTAH 6895 62793 EUREKA MINING CLAIM 1 3W 10S UTAH 6895 60214 EUREKA NO.01 1 3W 10S UTAH 6895 60216 EUREKA NO.02 12 3W 10S JUAB 6895 65570 EUREKA NO.06 29 2W 10S JUAB 6090 40037 EVA FRACTION 24 3W 10S JUAB 6897 60763 EVANS 32 2W 10S JUAB 6052 65571 EVELYNE 31, 36 2W, 3W 10S JUAB 3382 40076 EVENING STAR 29 2W 10S JUAB 6025 40045 FIDDLER 7, 12 2W, 3W 10S JUAB 6043 43546, 21931 FIELD 16 2W 10S UTAH 6936 40333 FINLAY 20 2W 10S UTAH 5709 19296 FINLEY 19, 20 2W 10S UTAH 324 19333 FLAGSTAFF 2, 35 3W 9S, 10S JUAB 4321 34333 FLORENCE 1, 6 2W, 3W 10S UTAH 6569 21868 FLORENCE (AMENDED) 32, 33 2W 10S UTAH, JUAB 6052 19344 FLOWER 12, 13 3W 10S JUAB 3373 21930 FOURTH OF JULY 16 2W 10S UTAH 5550 21852 FRACTION VICTORY NO.1 16, 21 2W 10S UTAH 4668 19311 FRACTION GOLD HILL 4 2W 10S UTAH 6402 60697 FRACTION 32 2W 10S JUAB 6052 65584 FRACTION 16 2W 10S UTAH 4668 62735 FRACTION HEDWIG 235 Tintic Project April 25, 2024

Osisko Development Corp. Section Range Township County SurveyNo. State Of Utah TaxPropertyNo. Name 4 2W 10S UTAH 6402 60698 FRACTION NO.1 17 2W 10S UTAH 5823 40396 FRANCELIA 29 2W 10S UTAH 6025 40050 FRANK 31 2W 10S JUAB 4109 34303 FRANKIE NO.1 31 2W 10S JUAB 4110 51910 FRANKIE NO.2 30, 31 2W 10S JUAB 4111 51921 FRANKIE NO.3 15, 16, 21, 22 2W 10S UTAH 6204 19285 GREAT CARBONATE QUEEN A 31 2W 10S JUAB 3852 40096 GARNET 15 2W 10S UTAH 6848 60367 GATLEY LODE MINING CLAIM 13 3W 10S JUAB 69 60749 GEMINI 13 3W 10S JUAB 111 60722 GEMINI EXTENSION 7, 12 2W, 3W 10S JUAB 111 43523 GEMINI MS 13 3W 10S JUAB 4379 60769 GEMINI NO.2 24 3W 10S JUAB 308 40086 GENERAL HARRISON 1 3W 10S UTAH 6569 64002 GENERAL SLOCUM 24 3W 10S JUAB 296 21925 GEORGE A. WILSON 35,36 3W 9S UTAH 265 60329 GET THERE ELI 4, 33 2W 9S, 10S UTAH 6513 12125 GETUP 7, 12 2W, 3W 10S UTAH, JUAB 6024 60321, 21926 GIANT 32 2W 10S JUAB 6847 63139 GILES 29 2W 10S JUAB 6090 319737 GOEASY 30 2W 10S JUAB 3981 40072 GOLCONDA 33 2W 10S UTAH, JUAB 6574 61056 GOLD BOND NO.17 33 2W 10S UTAH, JUAB 6574 19275 GOLD BOND NO.18 28, 33 2W 10S UTAH 6574 62693 GOLD BOND NO.19 27, 28 2W 10S UTAH 6574 61057 GOLD BOND NO.20 28, 33 2W 10S UTAH 6574 62694 GOLD BOND NO.21 27, 34 2W 10S UTAH 6759 60538 GOLD BOND NO.13 AMENDED 28, 33 2W 10S UTAH 6759 19270 GOLD BOND NO.22 27, 34 2W 10S UTAH 6759 21789 GOLD BOND NO.12 27, 34 2W 10S UTAH 6759 60539 GOLD BOND NO.14 27, 34 2W 10S UTAH 6759 60540 GOLD BOND NO.15 27 2W 10S UTAH 6759 60541 GOLD BOND NO.16 20 2W 10S UTAH 5466 19307 GOLDEN CHARIOT MINE NO.1 20 2W 10S UTAH 5466 62732 GOLDEN CHARIOT NO.2 20 2W 10S UTAH 5466 62733 GOLDEN CHARIOT NO.3 20, 21 2W 10S UTAH 5533 19306 GOLDEN CHARIOT NO.4 4, 9 2W 10S UTAH 4126 60723 GOLDEN EAGLE 236 Tintic Project April 25, 2024

Osisko Development Corp. Section Range Township County SurveyNo. State Of Utah TaxPropertyNo. Name 21 2W 10S UTAH 6091 62711 GOLDEN FISURE 16 2W 10S UTAH 5878 21846 GOLDEN HORSE SHOE 32 2W 10S JUAB 4136 34931 GOLDEN KEY 24 3W 10S JUAB 311 21927 GOLDEN RAY 6 2W 11S JUAB 78 40182 GOLDEN TREASURE 17 2W 10S UTAH 4628 40407 GOLDEN TREASURE 18 2W 10S JUAB 3742 62830 GOOD ENOUGH 8, 9 2W 10S UTAH 6402 60699 GOOD WILL 24 3W 10S JUAB 311 60793 GOODENOUGH NO.2 4, 5, 9 2W 10S UTAH 6402 23531 GOODLUCK 20 2W 10S UTAH 5708 19297 GOSHEN NO.4 29, 30, 31, 32 2W 10S JUAB 85 51911 GOVERNOR 30 2W 10S JUAB 4522 40087 GRACE 28 2W 10S UTAH 6606 19272 GRACE 6 2W 11S JUAB 317 40178 GRACE ELY 5 2W 11S JUAB 6528 40436, 66425 GRAND EASTERN NO.010 5 2W 11S JUAB 6528 40434, 66433 GRAND EASTERN NO.009 17 2W 10S UTAH 6059 60712 GRANITE MOUNTAIN 18 2W 10S JUAB 234 21928 GRANITE 17 2W 10S UTAH 6061 40382 GRANT NO.1 8,17 2W 10S UTAH 6061 40383 GRANT NO.2 8,17 2W 10S UTAH 6061 40384 GRANT NO.3 17 2W 10S UTAH 6061 40385 GRANT NO.4 17 2W 10S UTAH 6061 40386 GRANT NO.5 17 2W 10S UTAH 5740 19292 GREAT EASTERN #1 16, 17 2W 10S UTAH 5740 65617 GREAT EASTERN #2 16, 17, 20, 21 2W 10S UTAH 5740 62717 GREAT EASTERN #3 16, 21 2W 10S UTAH 5740 65618 GREAT EASTERN #4 16, 21 2W 10S UTAH 5740 19294 GREAT EASTERN #5 17, 20, 21 2W 10S UTAH 5740 62725 GREAT EASTERN #6 20 2W 10S UTAH 5740 62726 GREAT EASTERN #7 16 2W 10S UTAH 5740 62727 GREAT EASTERN #8 20 2W 10S UTAH 5740 62728 GREAT IRISH CHANGE 31 2W 10S JUAB 298 51925 GREAT WHEL VOR 15 2W 10S UTAH 6393 21838 GREYHOUND 15 2W 10S UTAH 6393 60701 GREYHOUND NO.2 AMENDED 15 2W 10S UTAH 6393 60702 GREYHOUND NO.3 15 2W 10S UTAH 6393 60703 GREYHOUND NO.4 15, 21, 22 2W 10S UTAH 6465 19280 GREYHOUND NO.5 16 2W 10S UTAH 5795 66458 GRUTLI 237 Tintic Project April 25, 2024

Osisko Development Corp. Section Range Township County SurveyNo. State Of Utah TaxPropertyNo. Name 16 2W 10S UTAH 5795 66460 GRUTLI EXTENTION 16 2W 10S UTAH 4984 19308 FRACTION OF GRUTLI NUMBER 3 16 2W 10S UTAH 4984 62734 GRUTLI NO.3 31 2W 10S JUAB 3852 51912 GUARDIAN 24 3W 10S JUAB 346 60773 HADES 8, 9, 16 2W 10S UTAH 5736 60718 HANIBAL 6 2W 10S UTAH 6884 21865 HARDING 17, 20 2W 10S UTAH 4759 40402 HAWK 16, 21 2W 10S UTAH 4668 62736 HEDWIG 4,9 2W 10S UTAH 6631 21799 HELEN 29 2W 10S UTAH 5472 21854 HEMITITE 24 3W 10S JUAB 3626 60775 HIATUS 16 2W 10S UTAH 6754 4351 HICKS FRACTION 10 2W 10S UTAH 6466 60655 HIDDEN TREASURE #3 9, 10 2W 10S UTAH 6466 60656 HIDDEN TREASURE #4 9, 10, 15, 16 2W 10S UTAH 6527 21814 HIDDEN TREASURE #2 9, 10, 15, 16 2W 10S UTAH 6466 21824 HIDDEN TREASURE 16 2W 10S UTAH 38 19327 HIGHLAND MARY 4 2W 10S UTAH 6402 21836 HILL SIDE 4 2W 10S UTAH 6463 60671, 21829 HILL SIDE NO.1 27 2W 10S UTAH 6757 60559 HILL TOP 34 2W 10S UTAH 6759 21788 HILL TOP NUMBER 1 22, 23, 27 2W 10S UTAH 6800 21765 HILL TOP NO.1 34 2W 10S UTAH 6759 60551 HILL TOP NUMBER 2 23, 27 2W 10S UTAH 6800 60444 HILL TOP NO.2 27, 34 2W 10S UTAH 6759 60544 HILL TOP NUMBER 3 27 2W 10S UTAH 6800 60445 HILL TOP NO.3 27, 33, 34 2W 10S UTAH 6759 60543 HILL TOP NUMBER 4 27 2W 10S UTAH 6800 60446 HILL TOP NO.4 27, 28, 33,34 2W 10S UTAH 6759 60546 HILL TOP NUMBER 5 27 2W 10S UTAH 6800 60447 HILL TOP NO.5 27 2W 10S UTAH 6759 60545 HILL TOP NUMBER 6 23, 27 2W 10S UTAH 6800 60448 HILL TOP NO.6 34 2W 10S UTAH 6759 60547 HILL TOP NUMBER 7 27 2W 10S UTAH 6800 60449 HILL TOP NO.7 25 3W 10S JUAB 6068 40071 HILLSIDE 35 3W 9S UTAH, JUAB 265 60330 HOBBS 25, 36 3W 10S JUAB 3295 40307 HOLMAN 25, 36 3W 10S JUAB 3852 40095 HOME RULE 19 2W 10S JUAB 4472 20999 HONORA 238 Tintic Project April 25, 2024

Osisko Development Corp. Section Range Township County SurveyNo. State Of Utah TaxPropertyNo. Name 24 3W 10S JUAB 203 60774 HORNSILVER 2W 10S UTAH UTAH 6091 62714 HORSE SHOE NO.1 2W 10S UTAH UTAH 6091 62712 HORSE SHOE 2W 10S UTAH UTAH 6091 62713 HORSESHOE A 18,19 2W 10S JUAB 197 62831 HOUGHTON 28, 29 2W 10S UTAH, JUAB 6847 62659 HOUSE 25, 36 3W 10S JUAB 3860 40030 HOWARD 19, 20 2W 10S UTAH 347 40416 HUMBUG 18, 19 2W 10S JUAB 3293 4298 HUMBUG LODE NO. 2 30 2W 10S JUAB 164 40111 HUNGARIAN 2, 35 3W 9S, 10S JUAB 264 60760 HYMICKYMUCK 15, 16 2W 10S UTAH 6392 21839 ICE KING 22 2W 10S UTAH 6767 19265 IDAHO FRACTION 25 3W 10S JUAB 3206 IMPEREIAL AKA IMPERIAL 20 2W 10S UTAH 325 19332 INDEPENDENCE 18, 19 2W 10S JUAB 3293 4299 INEZ MINE 14 2W 10S UTAH 6801 60438 INEZ NO.4 14 2W 10S UTAH 6801 21764 INEZ NO.1 14 2W 10S UTAH 6801 60436 INEZ NO.2 14 2W 10S UTAH 6801 36232 INEZ NO.3 14, 23 2W 10S UTAH 6801 60439 INEZ NO.5 14, 23 2W 10S UTAH 6801 60440 INEZ NO.6 23 2W 10S UTAH 6801 60441 INEZ NO.7 30, 25, 36 2W, 3W 10S JUAB 3860 40031 IONE 16, 17 2W 10S UTAH 6916 4347 IRMA FRACTION 30, 31 2W 10S JUAB 82 51926 IRON CLAD 33 3W 9S JUAB 281 4414 IRON CLOUD 21 2W 10S UTAH 6807 19263 IRON KING AM'D NO.1 21 2W 10S UTAH 6808 19262 IRON KING AMNDED 31 2W 10S JUAB 4360 40255 IVANHOE 17 2W 10S UTAH, JUAB 6114 60710 JACKFRACT 19 2W 10S JUAB 227 21899 JAMES G.BLAINE 15 2W 10S UTAH 6466 60657 JAMISON HILL 30, 36 2W, 3W 10S JUAB 3382 40077 JANUARY 24 3W 10S JUAB 6896 21924 JAY 11 3W 10S JUAB 4254 4395 JAY EYE SEE 29 2W 10S UTAH 4478 40324 JIM FISK 6 2W 10S UTAH 6569 60223 JOE DANDY 32 2W 10S JUAB 6429 40159 JOHN D 239 Tintic Project April 25, 2024

Osisko Development Corp. Section Range Township County SurveyNo. State Of Utah TaxPropertyNo. Name 31, 32 2W 10S JUAB 6429 40160 JOHN D NO.3 16, 17 2W 10S UTAH 5736 40400 JOHNY AND CLARA 15 2W 10S UTAH 6786 21779 JUDGE 6 2W 11S JUAB 77 40128 JULIAN LANE 2 3W 10S UTAH 264 60337 JUMBO 1,12 3W 10S UTAH, JUAB 6024 60322 JUMBO 36 3W 11S JUAB 3432 JUNCTION 36 3W 11S JUAB 3432 JUNCTION NO.2 1, 36 3W 10S, 11S JUAB 3432 JUNCTION NO.3 1, 36 3W 10S, 11S JUAB 3432 JUNCTION NO.4 30, 31 2W 10S JUAB 4519 51913 JUNE 20 2W 10S UTAH 4440 19312 JUNE BUG 31 2W 10S JUAB 136 51927 JUNE ROSE 17 2W 10S UTAH 4623 40409 JUNIATA 19, 30 2W 10S UTAH 320 51983 JUPITER LODE 20 2W 10S UTAH 314 19339 JUSTICE 2W 10S UTAH 6563 KARREN FRACTION 22 2W 10S UTAH 6563 65661 KARREN NO.1 22 2W 10S UTAH 6563 65662 KARREN NO.2 22 2W 10S UTAH 6563 65663 KARREN NO.3 22, 27 2W 10S UTAH 6563 65664 KARREN NO.4 13 3W 10S JUAB 112 60768 KEY STONE 7,18 2W 10S JUAB 112 43536 KEY STONE MILL SITE 35,36 3W 9S UTAH 265 60331 KID 16, 21 2W 10S UTAH 5740 62720 KIDNAPPING 31 2W 10S JUAB 87 24757 KING JAMES 13 3W 10S JUAB 4378 21893 KINGSTON 21, 28 2W 10S UTAH 6595 62685 KLENZO 21, 28 2W 10S UTAH 6595 62686 KLENZO NO.2 17 2W 10S UTAH, JUAB 6114 60711 KNIGHT 17 2W 10S UTAH 6059 40388 KNIGHTSVILLE 35 3W 9S UTAH 265 60332 KO KO 30 2W 10S JUAB 3046 40080 KOH - I - NOOR 29 2W 10S UTAH 122 21863 LA BONTA 19, 20, 29, 30 2W 10S UTAH 3364 24805 LAKEVIEW 19, 20, 29, 30 2W 10S UTAH, JUAB 3450 40417 LAKE VIEW 30 2W 10S UTAH 342 40420 LAKEVIEW GOLD & SILVER 23 2W 10S UTAH 6803 21761 LAMB NO.010 240 Tintic Project April 25, 2024

Osisko Development Corp. Section Range Township County SurveyNo. State Of Utah TaxPropertyNo. Name 23 2W 10S UTAH 6803 60422 LAMB NO.011 23 2W 10S UTAH 6803 60423 LAMB NO.012 23 2W 10S UTAH 6803 60425 LAMB NO.013 23 2W 10S UTAH 6803 60426 LAMB NO.014 23 2W 10S UTAH 6803 21760 LAMB NO.015 23 2W 10S UTAH 6803 60418 LAMB NO.016 23 2W 10S UTAH 6803 60419 LAMB NO.017 23 2W 10S UTAH 6803 60420 LAMB NO.019 23 2W 10S UTAH 6802 21763 LAMB NO.020 23 2W 10S UTAH 6802 60431 LAMB NO.021 14,23 2W 10S UTAH 6802 60432 LAMB NO.022 14, 23 2W 10S UTAH 6803 60421 LAMB NO.003 14 2W 10S UTAH 6801 60442 LAMB NO.004 14, 23 2W 10S UTAH 6803 21759 LAMB NO.005 14, 23 2W 10S UTAH 6802 60434 LAMB NO.006 23 2W 10S UTAH 6803 60414 LAMB NO.007 14, 23 2W 10S UTAH 6802 60435 LAMB NO.008 6, 31 2W 9S, 10S UTAH 6431 21882 LAP 31 2W 9S UTAH 6431 60302 LAP NO.1 20 2W 10S UTAH 4140 19320 LAST CHANCE 31 2W 10S UTAH 4360 36350 LAST CHANCE 30, 31 2W 10S UTAH 3830 33281 LAST CHANCE 19 2W 10S UTAH 336 33275 LAST CHANCE 13, 9 3W 10S JUAB 261 21950 LAST CHANCE 9, 16 2W 10S UTAH 6527 65671, 60623 LAST CHANCE 16 2W 10S UTAH 4178 21856 LAST HOPE 13 3W 10S JUAB 6081 21904, 49127 LEADVILLE 28,29,32,33 2W 10S UTAH, JUAB 6847 62660 LEDGE 13,24 3W 10S JUAB 132 21923 LEGAL 30 2W 10S JUAB 290 4363 LEO 24 3W 10S JUAB 6475 60817 LEO CLAIM 20 2W 10S UTAH 5983 19290 LEONA 19, 29, 30 2W 10S UTAH 3370 24801 LEONORA 29 2W 10S JUAB 6090 40039 LETHBRIDGE 17 2W 10S UTAH 4759 40403 LETTA 7 2W 10S JUAB 6024 60815 LITTLE GEM 13 3W 10S JUAB 3622 21921 LIABILITY 16 2W 10S UTAH 4282 62738 LILLEY OF WEST 16 2W 10S UTAH 6933 19257 LILY FRACTION 16 2W 10S UTAH 6931 19258 LILY SLIVER 241 Tintic Project April 25, 2024

Osisko Development Corp. Section Range Township County SurveyNo. State Of Utah TaxPropertyNo. Name 4, 9 2W 10S UTAH 6402 60404 LIMESTONE 32,33 2W 9S UTAH 6402 21885 LIMIT 31 2W 9S UTAH 6431 60303 LIMIT NO.010 31 2W 9S UTAH 6431 60304 LIMIT NO.011 31,32 2W 9S UTAH 6431 60305 LIMIT NO.009 19 2W 10S JUAB 3490 51984 LION 30 2W 10S JUAB 290 4364 LISBON 13 3W 10S JUAB 5171 65685 LITTLE CHIEF 20 2W 10S UTAH 5850 40395 LITTLE FRED 30 2W 10S JUAB 4181 40117 LITTLE HOPES 19 2W 10S UTAH 3220 40424 LITTLE LYON 16 2W 10S UTAH 4104 19323 LITTLE SLVER KING 30 2W 10S JUAB 320 24796 LIZZIE LODE 24 3W 10S JUAB 198 4323 LOOKEY JACK 1,2, 35 3W 9S, 10S UTAH, JUAB 264 21902 LOUISE 16 2W 10S UTAH 4323 19315 LOVE WANDERER 30 2W 10S JUAB 3221 40093 LOWER MAMMOTH 29 2W 10S UTAH 5471 21855 LUCILE 6, 31 2W 10S, 11S JUAB 4360 40257 LUCKY BOY 3,4,33,34 2W 9S, 10S UTAH 6629 21800 LUCKY BOY 13,18,19,24 2W, 3W 10S JUAB 6565 60766 LUCKY BOY JR 4,33 2W 9S, 10S UTAH 6629 60603 LUCKY BOY NO.2 6 2W 10S UTAH 6432 65708 LUPUS 6 2W 10S UTAH 6432 60274 LUPUS NO.002 6 2W 10S UTAH 6432 60276 LUPUS NO.003 6 2W 10S UTAH 6432 60273 LUPUS NO.001 6 2W 10S UTAH 6431 60277 LUPUS NO.009 35,36 3W 9S UTAH 264 60338 MABEL 20 2W 10S UTAH 5584 19304 MACK 35 3W 9S UTAH, JUAB 265 60978 MAE E. A. 18, 19 2W 10S JUAB 4102 40186 MAGGIE S 18, 19 2W 10S JUAB 4102 40187 MAGGIE S #2 5 2W 10S UTAH 6630 21867 MAGPIE 19, 20 2W 10S UTAH 3970 19325 MAHOGANY 17, 20 2W 10S UTAH 4099 18768 MAPLE 29, 30, 31, 32 2W 10S JUAB 4519 51928 MARCH 24 3W 10S JUAB 5081 21922 MARCUS AURELIUS 3,34 2W 9S, 10S UTAH 6598 21806 MARINDA NO.1 3,34 2W 9S, 10S UTAH 6598 60596 MARINDA NO.2 242 Tintic Project April 25, 2024

Osisko Development Corp. Section Range Township County SurveyNo. State Of Utah TaxPropertyNo. Name 19, 30 2W 10S JUAB 320 51980 MARS LODE 31 2W 10S JUAB 137 51915 MARTHA WASHINGTON NO.2 31 2W 10S JUAB 3873 51916 MARY 24 3W 10S JUAB 311 60984 MARY ALICE 24 3W 10S JUAB 311 60986 MARY BELL 6 2W 11S JUAB 4360 40258 MARY ELLEN 2, 35 3W 9S, 10S JUAB 4321 4413 MARY JANE 35 3W 9S JUAB 3746 40294 MARY V.H. 30 2W 10S JUAB 4473 40098 MASCOT 9 2W 10S UTAH 6467 21820 MATILDA 18,19 2W 10S JUAB 315 21920 MATILDA 6,7 2W 10S UTAH 6024 60324 MAUD S 17, 18, 19, 20 2W 10S JUAB 3267 4296 MAY DAY 17 2W 10S UTAH 4283 40413 MAY DAY ANNEXATTION 6,7 2W 10S UTAH 6534 48737 MAY FLOWER NO.2 29,32 2W 9S UTAH 6484 60255 MEG MERILESS 19, 20 2W 10S UTAH 220 19345 MIDDLE MAN 34 2W 9S UTAH 6017 21842 MIDNIGHT EXTENSION 9 2W 10S UTAH 6438 40431 MILLER 30 2W 10S JUAB 3521 40106 MINERS DELIGHT 20 2W 10S UTAH 3835 65245 MINNEY MOORE 17 2W 10S UTAH 4623 40410 MINNIE 18 2W 10S JUAB 6290 60985 MODELA 32 2W 10S JUAB 4604 MOLLIE GIBSON 32 2W 10S JUAB 4604 MOLLIE GIBSON NO.2 5, 6, 32 2W 10S, 11S JUAB 4604 MOLLIE GIBSON NO.3 5, 6, 32 2W 10S, 11S JUAB 4604 MOLLIE GIBSON NO.4 30, 36 2W, 3W 10S JUAB 3830 40022 MOLLY BAWN 24, 25 3W 10S JUAB 250 39938 MOLLY S 13,24 3W 10S JUAB 70 60781 MONO 20 2W 10S UTAH 4143 19319 MONTANA 21, 22 2W 10S UTAH 6767 62669 MONTANA 21, 22 2W 10S UTAH 6767 62670 MONTANA NO.2 6 2W 10S UTAH 6569 65259 MONTE CARLO 20, 29 2W 10S UTAH 4420 62741 MORNING STAR 24 3W 10S JUAB 5108 60779 MORNING STAR 19 2W 10S UTAH 3220 40425 MOUNTAIN VIEW 17, 20 2W 10S UTAH 3326 19331, 40421 MOUNTAIN VIEW 16 2W 10S UTAH 5795 66461 MY CATHARINA B. 20 2W 10S UTAH 5822 40397 MYRTLE 243 Tintic Project April 25, 2024

Osisko Development Corp. Section Range Township County SurveyNo. State Of Utah TaxPropertyNo. Name 35 3W 9S UTAH, JUAB 265 30982 N. A. R. 9, 16 2W 10S UTAH 6438 40427 NATRONA 28 2W 9S UTAH 6484 60256 N END 28 2W 9S UTAH 6484 60251 N END NO.1 28 2W 9S UTAH 6484 60257 N END NO.10 28 2W 9S UTAH 6484 21873 N END NO.2 28 2W 9S UTAH 6484 60241 N END NO.3 28, 29 2W 9S UTAH 6484 60258 N END NO.4 28 2W 9S UTAH 6484 60259 N END NO.5 28 2W 9S UTAH 6484 21874 N END NO.6 28, 29 2W 9S UTAH 6484 60247 N END NO.7 28 2W 9S UTAH 6484 60252 N END NO.8 28 2W 9S UTAH 6484 60253 N END NO.9 6 2W 10S UTAH 6491 21872 NORTH OF IRELAND NO.1 6 2W 10S UTAH 6491 60236 NORTH OF IRELAND NO.2 6 2W 10S UTAH 6491 60237 NORTH OF IRELAND NO.3 6 2W 10S UTAH 6491 60239 NORTH OF IRELAND NO.4 25, 36 3W 10S JUAB 2955 40309 NORTH SWANSEA 5, 32 2W 9S, 10S UTAH 6430 60308 N.S. NO.016 5, 32 2W 9S, 10S UTAH 6430 60309 N.S. NO.017 3 2W 10S UTAH 6463 60677 N. TUNNEL 3 2W 10S UTAH 6463 60678 N. TUNNEL NO.1 3 2W 10S UTAH 6463 60679 N. TUNNEL NO.2 3 2W 10S UTAH 6463 21828 N. TUNNEL NO.3 3 2W 10S UTAH 6463 60672 N. TUNNEL NO.4 3 2W 10S UTAH 6463 60673 N. TUNNEL NO.5 2 3W 10S JUAB 38 60758 N.E. 18 2W 10S JUAB 212 62825 NORTH EXTENSION BLUE BELL 6,31 2W 9S, 10S UTAH 6431 21879 N.S. NO.007 4,5,33 2W 9S, 10S UTAH 6402 60316 N.S. NO.19 5 2W 10S UTAH 6431 60286 N.S. NO.001 5, 6, 32 2W 9S, 10S UTAH 6431 60287 N.S. NO.010 5, 32 2W 9S, 10S UTAH 6431 60288 N.S. NO.011 5, 32 2W 9S, 10S UTAH 6431 60290 N.S. NO.012 4,5,32,33 2W 9S, 10S UTAH 6402 60315 N.S. NO.18 5 2W 10S UTAH 6431 21880 N.S. NO.002 5,6 2W 10S UTAH 6431 60282 N.S. NO.003 6 2W 10S UTAH 6431 60283 N.S. NO.004 6 2W 10S UTAH 6431 60284 N.S. NO.005 6 2W 10S UTAH 6431 60285 N.S. NO.006 244 Tintic Project April 25, 2024

Osisko Development Corp. Section Range Township County SurveyNo. State Of Utah TaxPropertyNo. Name 6,31 2W 9S, 10S UTAH 6431 60280 N.S. NO.008 6,31,32 2W 9S, 10S UTAH 6431 60281 N.S. NO.009 2 3W 10S JUAB 38 60759 N.W. 19, 20 2W 10S UTAH 323 19334 NARROW GUAGE 9, 16 2W 10S UTAH 6438 40427 NATRONA 29, 30 2W 10S UTAH 342 40419 NEVADA 22 2W 10S UTAH 6767 62671 NEVADA 19 2W 10S UTAH 4767 19309 NEVADA 29 2W 10S UTAH, JUAB 6779 4383 NEVADA EXTENSION 29 2W 10S UTAH, JUAB 6025 40047 NEVADA EXTENSION NO.1 22 2W 10S UTAH 6767 62672 NEVADA NO.1 21, 22 2W 10S UTAH 6767 19264 NEVADA NO.2 29 2W 10S JUAB 6779 4369 NEVADA NO.3 21, 22 2W 10S UTAH 6766 62681 NEVADA NO.3 29 2W 10S JUAB 6090 40040 NEVADA NO.4 15, 22 2W 10S UTAH 6767 21784 NEVADA NO.4 21, 22 2W 10S UTAH 6766 62682 NEVADA NO.6 28, 29 2W 10S UTAH 6606 62684 NEVADA TUNNEL EXTENSION NO.2 28, 29 2W 10S UTAH 6847 19259 NEVADA TUNNEL EXTENSION 29 2W 10S UTAH 6847 19261 NEVADA TUNNEL NO.2 AMENDED 32, 33 2W 10S UTAH 6847 62664 NEVADA TUNNEL NO.3 32 2W 10S UTAH 6052 65306 NEVADA TUNNELL NO.4 32 2W 10S UTAH 6052 65307 NEVADA TUNNELL NO.5 20 2W 10S UTAH 5585 19303 NELLIE 18,19 2W 10S JUAB 239 63428 NOAH 19 2W 10S JUAB 6550 62824 NOAH FRACTION 31 2W 10S JUAB 117 51929 NOM DE PLUME 18 2W 10S JUAB 213 24820 NORTH EXTENSION EAGLE 13 3W 10S JUAB 231 25528 NORTH EXTENSION RIDGE 13 3W 10S JUAB 231 25531 NORTH EXTENSION VALLEY 13 3W 10S JUAB 231 25530 NORTH EXTENSION ZULU 30 2W 10S JUAB 62 40078 NORTH STAR LODE 29 2W 10S UTAH 129 40426 NORTHERN SPY 13 3W 10S JUAB 276 21948, 43549 NORWAY 13 3W 10S JUAB 6539 43548, 43547 NORWAY FRACTION 29,32 2W 10S JUAB 4548 60811 OCKONOOK 5 2W 10S UTAH 4827 21887 OHIO MINING CLAIM 245 Tintic Project April 25, 2024

Osisko Development Corp. Section Range Township County SurveyNo. State Of Utah TaxPropertyNo. Name 33 2W 10S UTAH 6847 62654 OLD ROSE AMENDED 28, 33 2W 10S UTAH 6847 62655 OLD ROSE NO.1 AMENDED 13 3W 10S JUAB 275 21947 OLE BOLE 35,36 3W 9S UTAH 265 60333 ONNIE GAGAN 19 2W 10S JUAB 6885 60743 OVERSIGHT 9 2W 10S UTAH 5974 21845 OXEN 12 3W 10S UTAH, JUAB 6024 21917, 65348 PALERMO 17, 18 2W 11S JUAB 3359 62347 PARALLEL 7 2W 10S UTAH, JUAB 6024 43508 PARROT 28 2W 10S UTAH 6574 62695 PAUL 28 2W 10S UTAH 6574 19274 PAUL NO.1 28, 33 2W 10S UTAH 6574 62689 PAUL NO.2 28 2W 10S UTAH 6574 62690 PAUL NO.3 28,33 2W 10S UTAH 6574 62691 PAUL NO.4 28 2W 10S UTAH 6574 62692 PAUL NO.5 7,8 2W 10S UTAH 3286 21859 PAXMAN 7,8 2W 10S UTAH 3518 21860 PAXMAN MILL SITE NO.2 4 2W 10S UTAH 6730 21797 PEACE 4 2W 10S UTAH 6730 60579 PEACE FRACTION 33 2W 9S UTAH 6516 60628 PEAK 24, 25 3W 10S JUAB 306 40085 PEWABIC 20, 29 2W 10S UTAH 3700 19328 PHEBE S 19 2W 10S JUAB 3368 24807 PHEBE SHULER 30 2W 10S JUAB 152 40089 PHOENIX 9 2W 10S UTAH 6771 4350 PINE 24, 25 3W 10S JUAB 250 39939 PINEY 4, 33 2W 9S, 10S UTAH 6516 60629 PINYON 30 2W 10S JUAB 3836 40082 PRINCE OF INDIA 20 2W 10S UTAH 3147 19338 PROTECTION 25, 36 3W 10S JUAB 5893 40032 QUARTZITE 4 2W 10S UTAH 6515 21818 R.R.FRACTION 5, 32 2W 9S, 10S UTAH 6630 60222 RABBIT 3 2W 10S UTAH 6463 21827 RAILROAD NO.010 3 2W 10S UTAH 6463 60667 RAILROAD NO.012 3 2W 10S UTAH 6463 60668 RAILROAD NO.013 3 2W 10S UTAH 6463 60669 RAILROAD NO.014 3 2W 10S UTAH 6463 21826 RAILROAD NO.004 3 2W 10S UTAH 6563 60662 RAILROAD NO.005 29 2W 10S JUAB 6025 40048 RAIN STORM 246 Tintic Project April 25, 2024

Osisko Development Corp. Section Range Township County SurveyNo. State Of Utah TaxPropertyNo. Name 16 2W 10S UTAH 4100 19324 RALPH 19, 30 2W 10S UTAH, JUAB 336 RALPH 19 2W 10S UTAH, JUAB 336 51952 RANGER CONSOLIDATED 23 2W 10S UTAH 6804 60413 RATTLESNAKE NO.013 14 2W 10S UTAH 6802 60427 RATTLESNAKE NO.002 31 2W 10S JUAB 151 51917 RATTLER 14 2W 10S UTAH 6802 60428 RATTLESNAKE NO.003 23 2W 10S UTAH 6802 21762 RATTLESNAKE NO.001 23 2W 10S UTAH 6804 21758 RATTLESNAKE NO.010 23 2W 10S UTAH 6804 60411 RATTLESNAKE NO.011 23 2W 10S UTAH 6804 60412 RATTLESNAKE NO.012 14 2W 10S UTAH 6802 60429 RATTLESNAKE NO.004 14 2W 10S UTAH 6804 60410 RATTLESNAKE NO.005 14 2W 10S UTAH 6804 62789 RATTLESNAKE NO.006 14 2W 10S UTAH 6804 60392 RATTLESNAKE NO.007 14 2W 10S UTAH 6804 60393 RATTLESNAKE NO.008 23, 14 2W 10S UTAH 6804 60394 RATTLESNAKE NO.009 19 2W 10S JUAB 4391 51979 RAVIENE 29 2W 10S JUAB 6090 40041 RAYMOND 20 2W 10S UTAH 4422 19313 RED BIRD 13 3W 10S JUAB 96 60981 RED BIRD 33 2W 10S UTAH 6648 40365 RED CROSS NO. 25 AMENDED 33 2W 10S UTAH 6648 40366 RED CROSS NO. 26 AMENDED 33 2W 10S UTAH 6648 40367 RED CROSS NO. 27 AMENDED 33 2W 10S UTAH 6648 40368 RED CROSS NO. 28 AMENDED 33, 34 2W 10S UTAH 6648 40369 RED CROSS NO. 29 AMENDED 34 2W 10S UTAH 6648 40370 RED CROSS NO. 30 AMENDED 34 2W 10S UTAH 6648 40371 RED CROSS NO. 31 AMENDED 34 2W 10S UTAH 6648 40372 RED CROSS NO. 32 AMENDED 34 2W 10S UTAH 6648 40373 RED CROSS NO. 33 AMENDED 34 2W 10S UTAH 6648 40374 RED CROSS NO. 34 AMENDED 3 2W 11S UTAH, JUAB 6605 32704 RED CROSS NO.111 3 2W 11S UTAH 6679 32792 RED CROSS NO.112 3 2W 11S UTAH 6679 32792 RED CROSS NO.113 3 2W 11S UTAH 6679 32792 RED CROSS NO.114 3 2W 11S UTAH 6681 40350 RED CROSS NO.115 3 2W 11S UTAH 6681 40351 RED CROSS NO.116 3 2W 11S UTAH 6681 40352 RED CROSS NO.117 247 Tintic Project April 25, 2024

Osisko Development Corp. Section Range Township County SurveyNo. State Of Utah TaxPropertyNo. Name 3, 35 2W 11S UTAH 6681 40353 RED CROSS NO.118 33 2W 10S UTAH, JUAB 6608 76750 RED CROSS NO.041 34 2W 10S UTAH 6648 40379 RED CROSS NO. 52 34 2W 10S UTAH 6648 40380 RED CROSS NO. 53 34 2W 10S UTAH 6648 40381 RED CROSS NO. 54 33 2W 10S JUAB 6608 RED CROSS NO.061 3 2W 11S UTAH 6679 32792 RED CROSS NO.071 34 2W 10S UTAH 6679 32792 RED CROSS NO. 72 34 2W 10S UTAH 6679 32792 RED CROSS NO. 73 34 2W 10S UTAH 6679 32792 RED CROSS NO. 74 34 2W 10S UTAH 6681 40342 RED CROSS NO. 75 34 2W 10S UTAH 6681 40343 RED CROSS NO. 76 34 2W 10S UTAH 6681 40344 RED CROSS NO. 77 26, 34, 35 2W 10S UTAH 6681 40375 RED CROSS NO. 78 3 2W 11S UTAH 6679 40151 RED CROSS NO. 91 3 2W 11S UTAH 6679 40152 RED CROSS NO. 92 3 2W 11S UTAH 6679 40153 RED CROSS NO. 93 3 2W 11S UTAH 6679 40154 RED CROSS NO. 94 3 2W 11S UTAH 6681 40346 RED CROSS NO. 95 3 2W 11S UTAH 6681 40347 RED CROSS NO. 96 3 2W 11S UTAH 6681 40348 RED CROSS NO. 97 3, 35 2W 10S, 11S UTAH 6681 40349 RED CROSS NO. 98 33 2W 10S UTAH, JUAB 6608 4344 RED CROSS NO.042 AMENDED 10 2W 11S UTAH, JUAB 6695 35414 RED CROSS NO.191 9 2W 11S JUAB 6665 RED CROSS NO.201 9 2W 11S JUAB 6695 35414 RED CROSS NO.165 9 2W 11S JUAB 6695 35414 RED CROSS NO.165 AMENDED 9 2W 11S JUAB 6695 35414 RED CROSS AM 185 9 2W 11S JUAB 6695 35414 RED CROSS NO.188 9 2W 11S JUAB 6695 35414 RED CROSS NO.188 AMENDED 3 2W 11S UTAH, JUAB 6605 32704 RED CROSS NO.131 3 2W 11S UTAH, JUAB 6684 35415 RED CROSS NO.132 3 2W 11S UTAH, JUAB 6684 35415 RED CROSS NO.133 4 2W 11S JUAB 6640 39990 RED CROSS NO.144 4 2W 11S JUAB 6640 39991 RED CROSS NO.145 4 2W 11S JUAB 6640 RED CROSS NO.146 248 Tintic Project April 25, 2024

Osisko Development Corp. Section Range Township County SurveyNo. State Of Utah TaxPropertyNo. Name 4 2W 11S JUAB 6664 4328 RED CROSS NO.147 4 2W 11S JUAB 6664 4329 RED CROSS NO.148 4 2W 11S JUAB 6664 4330 RED CROSS NO.149 3, 10 2W 11S JUAB 6664 4331 RED CROSS NO.150 3, 10 2W 11S UTAH, JUAB 6664 4332 RED CROSS NO.151 3, 10 2W 11S UTAH, JUAB 6684 35415, 76443 RED CROSS NO.152 3, 10 2W 11S UTAH, JUAB 6684 35415, 4308 RED CROSS NO.153 8, 9 2W 11S JUAB 6665 RED CROSS NO.161 9 2W 11S JUAB 6665 RED CROSS NO.162 9 2W 11S JUAB 6665 RED CROSS NO.163 9 2W 11S JUAB 6695 RED CROSS NO.164 9 2W 11S JUAB 6695 RED CROSS NO.165 AMENDED 9 2W 11S JUAB 6664 RED CROSS NO.168 9 2W 11S JUAB 6664 4336 RED CROSS NO.169 10 2W 11S UTAH, JUAB 6664 4337 RED CROSS NO.170 10 2W 11S UTAH, JUAB 6664 4340 RED CROSS NO.171 10 2W 11S UTAH 6685 40260 RED CROSS NO.172 10 2W 11S UTAH 6685 35417 RED CROSS NO.173 10 2W 11S UTAH 6685 35417 RED CROSS NO.174 10 2W 11S UTAH 6685 35417, 40265 RED CROSS NO.175 8, 9 2W 11S JUAB 6665 RED CROSS NO.181 9 2W 11S JUAB 6665 RED CROSS NO.182 9 2W 11S JUAB 6665 RED CROSS NO.183 9 2W 11S JUAB 6695 35414 RED CROSS NO.184 9 2W 11S JUAB 6695 35414 RED CROSS NO.185 AMENDED 9 2W 11S JUAB 6695 35414 RED CROSS NO.186 9 2W 11S JUAB 6695 35414 RED CROSS NO.187 9, 10 2W 11S JUAB 6695 35414 RED CROSS NO.189 10 2W 11S UTAH, JUAB 6695 35414 RED CROSS NO.190 10 2W 11S UTAH, JUAB 6695 35414 RED CROSS NO.191 10 2W 11S UTAH 6685 35417 RED CROSS NO.192 10 2W 11S UTAH 6685 35417 RED CROSS NO.193 10 2W 11S UTAH 6685 35417 RED CROSS NO.194 10 2W 11S UTAH 6685 35417 RED CROSS NO.195 9 2W 11S JUAB 6665 RED CROSS NO.202 249 Tintic Project April 25, 2024

Osisko Development Corp. Section Range Township County SurveyNo. State Of Utah TaxPropertyNo. Name 9 2W 11S JUAB 6665 RED CROSS NO.203 9 2W 11S JUAB 6696 RED CROSS NO.204 9 2W 11S JUAB 6696 RED CROSS NO.205 9 2W 11S JUAB 6692 RED CROSS NO.206 9 2W 11S UTAH, JUAB 6692 RED CROSS NO.207 9 2W 11S UTAH, JUAB 6692 RED CROSS NO.208 9 2W 11S UTAH, JUAB 6692 RED CROSS NO.209 10 2W 11S UTAH, JUAB 6692 RED CROSS NO.210 10 2W 11S UTAH, JUAB 6692 RED CROSS NO.211 10 2W 11S UTAH 6685 35417 RED CROSS NO.212 10 2W 11S UTAH 6685 35417 RED CROSS NO.213 9 2W 11S JUAB 6696 RED CROSS NO.221 9 2W 11S JUAB 6696 RED CROSS NO.222 9 2W 11S JUAB 6696 RED CROSS NO.223 9 2W 11S JUAB 6696 RED CROSS NO.224 9 2W 11S JUAB 6696 RED CROSS NO.225 16 2W 11S UTAH, JUAB 6692 RED CROSS NO.226 9 2W 11S UTAH, JUAB 6692 40289 RED CROSS NO.227 9 2W 11S JUAB 6692 40290 RED CROSS NO.228 9, 10, 15, 16 2W 11S JUAB 6692 40291 RED CROSS NO.229 10, 15 2W 11S UTAH 6692 RED CROSS NO.230 10, 15 2W 11S UTAH 6692 RED CROSS NO.231 10, 15 2W 11S UTAH 6685 35417 RED CROSS NO.232 10, 15 2W 11S UTAH 6685 35417 RED CROSS NO.233 33 2W 10S UTAH 6648 40375 RED CROSS NO.050 33 2W 10S UTAH 6648 40377 RED CROSS NO.051 4 2W 11S JUAB 6587 32781 RED CROSS NO.081 4 2W 11S JUAB 6587 32781 RED CROSS NO.082 2, 35 3W 9S, 10S JUAB 3746 40297 RED ROCK 30 2W 10S JUAB 91 40315 RED ROSE 31 2W 10S JUAB 81 51930 REVERSE 30,31 2W 10S JUAB 333 51918 REVERSE NO.2 28 2W 10S UTAH 6595 62687 REXALL 28 2W 10S UTAH 6595 62688 REXALL NO.2 21 2W 10S UTAH 7157 19253 RHOMBUS 250 Tintic Project April 25, 2024

Osisko Development Corp. Section Range Township County SurveyNo. State Of Utah TaxPropertyNo. Name 24 3W 10S JUAB 6898 21916 RICHARD 13,24 3W 10S JUAB 106 25529 RIDGE 29 2W 10S JUAB 5708 25529 RIDGE 7,12,13,18 2W 10S JUAB 4536 43529, 43530 RIO TINTO 25, 36 3W 10S JUAB 5695 47258 RISING SUN 31 2W 10S JUAB 150 51931 ROADSIDE 13,24 3W 10S JUAB 71 21918 ROBBINS EUREKA 27, 34 2W 10S UTAH 6806 21754 ROBERT 27 2W 10S UTAH 6806 60374 ROBERT NO.001 23,26 2W 10S UTAH 6806 60375 ROBERT NO.010 26 2W 10S UTAH 6806 60376 ROBERT NO.011 23,26 2W 10S UTAH 6806 60377 ROBERT NO.012 26 2W 10S UTAH 6806 60378 ROBERT NO.013 23,26 2W 10S UTAH 6805 21756 ROBERT NO.014 26 2W 10S UTAH 6805 60387 ROBERT NO.015 26 2W 10S UTAH 6805 60388 ROBERT NO.016 26 2W 10S UTAH 6805 60389 ROBERT NO.017 26 2W 10S UTAH 6805 60390 ROBERT NO.018 26 2W 10S UTAH 6805 60391 ROBERT NO.019 23, 26, 27 2W 10S UTAH 6806 60379 ROBERT NO.002 26 2W 10S UTAH 6805 21755 ROBERT NO.020 26 2W 10S UTAH 6805 60380 ROBERT NO.021 26 2W 10S UTAH 6805 60381 ROBERT NO.022 26 2W 10S UTAH 6805 60383 ROBERT NO.023 26 2W 10S UTAH 6805 60384 ROBERT NO.024 26 2W 10S UTAH 6805 60384 ROBERT NO.025 23,26 2W 10S UTAH 6805 60385 ROBERT NO.026 23, 26 2W 10S UTAH 6805 60386 ROBERT NO.027 26, 27, 34 2W 10S UTAH 6806 21753 ROBERT NO.003 23, 26 2W 10S UTAH 6806 60368 ROBERT NO.004 26, 27, 34 2W 10S UTAH 6806 60369 ROBERT NO.005 23, 26 2W 10S UTAH 6806 60370 ROBERT NO.006 26 2W 10S UTAH 6806 60371 ROBERT NO.007 23, 26 2W 10S UTAH 6806 60372 ROBERT NO.008 26 2W 10S UTAH 6806 60373 ROBERT NO.009 24 3W 10S JUAB 250 39943 ROSA 21, 28 2W 10S UTAH 7138 61961 ROSE 4, 9 2W 10S UTAH 4126 60724 ROSSIE 24 3W 10S JUAB 223 40034 ROVER 4 3W 10S JUAB 3389 65932 RUBY a/k/a RUBY CONSOLIDATED 251 Tintic Project April 25, 2024

Osisko Development Corp. Section Range Township County SurveyNo. State Of Utah TaxPropertyNo. Name 32 2W 10S JUAB 6699 RUBY NO.060 32 2W 10S JUAB 6699 RUBY NO.061 32 2W 10S JUAB 6699 RUBY NO.062 AMENDED 6, 31 2W 10S, 11S JUAB 6666 40123 RUBY NO.055 31, 32 2W 10S JUAB 6666 40124 RUBY NO.056 32 2W 10S JUAB 6666 40125 RUBY NO.057 31, 32 2W 10S JUAB 6666 40126 RUBY NO.058 32 2W 10S JUAB 6666 40127 RUBY NO.059 32 2W 10S JUAB 6608 RUBY NO.052 5 2W 11S JUAB 6640 39971 RUBY NO.080 AMENDED 18 2W 10S UTAH, JUAB 3060 43542 RYAN MILLSITE 24 3W 10S JUAB 5348 60987 SOUTH EXTENSION OF THE WEST MAMOTH 4 2W 10S UTAH 6402 60407 S.S. 4 2W 10S UTAH 6463 65405 S.S. NO.1 4 2W 10S UTAH 6463 65406 S.S. NO.2 4 2W 10S UTAH 6463 65407 S.S. NO.3 3, 4 2W 10S UTAH 6516 60630 S. S. NO.6 19 2W 10S JUAB 216 62820 SOUTH EXTENSION BEECHER 19 2W 10S JUAB 215 24819 SOUTH EXTENSION BLUE BELL 4 2W 10S UTAH 6515 60643 S.S. NO.5 32, 33 2W 10S UTAH, JUAB 6052 62716 SAGE BRUSH 27, 28 2W 10S UTAH 7141 19254 SALLY 19 2W 10S UTAH 3219 19335 SALVATOR 16 2W 10S UTAH 4282 62739 SAMPSON 12 3W 10S UTAH, JUAB 6024 60989, 65412, 60990 SAN JUAN 16 2W 10S UTAH 39 19326 SARAH 12 3W 10S JUAB 6024 21913 SAVAGE 36 3W 10S JUAB 3976 40299 SEA SWAN 17, 20 2W 10S UTAH 5740 62721 SEPTEMBER 20 2W 10S UTAH 5883 19305 SEPTEMBER FRACTION 32, 33 2W 10S JUAB 6052 65416 SHAFT 28,29,32,33 2W 9S UTAH 6484 60242 SHAITAN 5, 32 2W 10S, 11S JUAB 6533 62598 SHAMROCK NO.2 5, 32 2W 10S, 11S JUAB 6533 62600 SHAMROCK NO.4 21 2W 10S UTAH 6808 62665 SHAWNEE 30 3W 10S JUAB 3983 40118 SHELBY 35 3W 9S UTAH 265 60334 SHERMAN 252 Tintic Project April 25, 2024

Osisko Development Corp. Section Range Township County SurveyNo. State Of Utah TaxPropertyNo. Name 2,11 2W 10S UTAH 7024 60358 SHIELD NO.007 2 2W 10S UTAH 7021 60360 SHIELD NO.001 2,11 2W 10S UTAH 7024 63149 SHIELD NO.010 2,11 2W 10S UTAH 7024 63150 SHIELD NO.011 2,11 2W 10S UTAH 7024 63151 SHIELD NO.012 2 2W 10S UTAH 7021 63152 SHIELD NO.002 2 2W 10S UTAH 7021 63157 SHIELD NO.026 2 2W 10S UTAH 7021 63158 SHIELD NO.027 2 2W 10S UTAH 7021 63159 SHIELD NO.028 2,3,10 2W 10S UTAH 7025 21749 SHIELD NO.029 2,11 2W 10S UTAH 7021 63153 SHIELD NO.003 2 2W 10S UTAH 7025 60352 SHIELD NO.030 2 2W 10S UTAH 7025 60353 SHIELD NO.031 2 2W 10S UTAH 7025 60354 SHIELD NO.032 2,11 2W 10S UTAH 7021 63154 SHIELD NO.004 2,11 2W 10S UTAH 7021 63155 SHIELD NO.005 2, 34 2W 9S, 10S UTAH 7025 60355 SHIELD NO.052 2, 34 2W 9S, 10S UTAH 7025 21748 SHIELD NO.053 2, 34 2W 9S, 10S UTAH 7025 60346 SHIELD NO.054 2, 34 2W 9S, 10S UTAH 7025 60348 SHIELD NO.055 2,3, 34 2W 9S, 10S UTAH 7025 60349 SHIELD NO.056 2,11 2W 10S UTAH 7021 63156 SHIELD NO.006 2,11 2W 10S UTAH 7024 63147 SHIELD NO.008 2,11 2W 10S UTAH 7024 63148 SHIELD NO.009 2 3W 10S JUAB 264 60971 SI TAM 16 2W 10S UTAH 4105 19322 SIDE EXTENSION OF L SILVER KING 21, 22 2W 10S UTAH 6767 62667 SIDE EXTENSION OF SUNRISE 30 3W 10S JUAB 6085 40025 SILVER BAR NO.1 30, 31, 36 2W, 3W 10S JUAB 6085 40441 SILVER BAR NO.2 24, 25 3W 10S JUAB 168 40073 SILVERBELT 24, 25 3W 10S JUAB 4664 4396 SILVERBELT #2 35 3W 9S UTAH 265 60335 SILVER BILL 30 2W 10S JUAB 5880 1273 SILVER CHAIN 31 2W 10S JUAB 144 51919 SILVER COIN 24 3W 10S JUAB 128 21912 SILVER GEM 30 2W 10S JUAB 4118 40067 SILVER HILL NO.1 30 2W 10S JUAB 4118 40068 SILVER HILL MINING CLAIM NO.2 30 2W 10S JUAB 4118 40069 SILVER HILL MINE NO.3 30 2W 10S JUAB 4118 40070 SILVER HILL MINE NO.4 30 3W 10S JUAB 5893 40073 SILVER REED NO. 1 253 Tintic Project April 25, 2024

Osisko Development Corp. Section Range Township County SurveyNo. State Of Utah TaxPropertyNo. Name 27, 28 2W 10S UTAH 6559 19279 SILVER ROCK # 1 27, 28 2W 10S UTAH 6559 62699 SILVER ROCK # 2 27, 28 2W 10S UTAH 6559 62700 SILVER ROCK # 3 30 2W 10S JUAB 290 4360 SILVER SPAR 30 2W 10S JUAB 290 4361 SILVER STAR 18 2W 10S JUAB 6401 60992 SILVERS 20, 29 2W 10S UTAH 221 19341 SIOUX 32 2W 10S JUAB 6847 63140 SLIM 18 2W 10S JUAB 6503 21914 SMUGGLER NO.4 31 2W 10S JUAB 3195 51932 SNAP DRAGON 25, 30 2W, 3W 10S JUAB 4523 40105 SNOWBIRD 16, 21 2W 10S UTAH 5740 4392 SNOWBIRD 35, 36 3W 10S JUAB 3294 76427, 40304 SNYDER 18 2W 10S JUAB 283 21911 SOLID MOULTOON 25, 30 2W, 3W 10S JUAB 4563 4386 SOUTH EUREKA NO. ONE 19 2W 10S JUAB 214 62821 SOUTH EXTENSION EAGLE 30 2W 10S JUAB 63 40108 SOUTH MAMMOTH 7 2W 10S UTAH 6432 21832 SOUTH SIDE 7 2W 10S UTAH, JUAB 6432 60686 SOUTH SIDE NO.1 7 2W 10S UTAH, JUAB 6432 60687, 21910 SOUTH SIDE NO.2 7,8 2W 10S UTAH 6432 60688 SOUTH SIDE NO.3 7,8 2W 10S UTAH 6432 60689 SOUTH SIDE NO.4 7,8 2W 10S UTAH 6432 60690 SOUTH SIDE NO.5 27 2W 10S UTAH 6757 60560 SOUTH STAND NO.01 22, 27 2W 10S UTAH 6757 60561 SOUTH STAND NO.10 27 2W 10S UTAH 6757 60561 SOUTH STAND NO.11 27 2W 10S UTAH 6757 21790 SOUTH STAND NO.03 27 2W 10S UTAH 6757 60542 SOUTH STAND NO.05 22, 27 2W 10S UTAH 6757 60548 SOUTH STAND NO.07 22, 27 2W 10S UTAH 6757 60549 SOUTH STAND NO.08 22, 27 2W 10S UTAH 6757 65436 SOUTH STAND NO.09 36 3W 10S JUAB 337 51935 SOUTH SWANSEA 24, 25 3W 10S JUAB 3234 4384 SPACE 17 2W 10S UTAH 4759 40404 SPARROW 20 2W 10S UTAH 4140 62740 SPY MINE NO.4 20 2W 10S UTAH 4149 19318 SPY NO.2 20 2W 10S UTAH 4166 19317 SPY NO.3 25 2W 10S JUAB 3206 40114 STANDARD 30 2W 10S UTAH, 289 21562 ST. GEORGE 254 Tintic Project April 25, 2024

Osisko Development Corp. Section Range Township County SurveyNo. State Of Utah TaxPropertyNo. Name JUAB 29,32 2W 9S UTAH 6484 60243 STELLA FRACTION 19, 30 2W 10S UTAH 3365 24803, 24804 STOCKTON 19, 30 2W 10S UTAH 3366 51991 STOCKTON NO.2 19 2W 10S UTAH 3367 24802 STOCKTON NO.3 18,19 2W 10S JUAB 210 60808 STONEWALL JACKSON 24 3W 10S JUAB 346 60991 STYX 20 2W 10S UTAH 260 19340 SUCCESS 19 2W 10S JUAB 254 86593 SULLIVAN 29, 32, 33 2W 10S UTAH, JUAB 6847 62656 SUMMIT 5 2W 10S UTAH 6430 60401 SUMMIT NO.01 4, 33 2W 9S, 10S UTAH 6516 60209, 60210 SUMMIT NO.10 5 2W 10S UTAH 6430 60402 SUMMIT NO.02 5 2W 10S UTAH 6430 60310 SUMMIT NO.03 4, 5 2W 10S UTAH 6402 60317 SUMMIT NO.04 4 2W 10S UTAH 6402 60318 SUMMIT NO.05 4 2W 10S UTAH 6402 60408 SUMMIT NO.06 4, 33 2W 9S, 10S UTAH 6402 21884 SUMMIT NO.07 33 2W 9S UTAH 6402 60198, 60199 SUMMIT NO.08 4, 33 2W 9S, 10S UTAH 6402 60192, 60193 SUMMIT NO.09 20 2W 10S UTAH 5740 63143, 62723 SUNBEAM #1 20 2W 10S UTAH 5740 63144, 62724 SUNBEAM #2 21 2W 10S UTAH 5740 63145, 62718 SUNBEAM #3 16, 21 2W 10S UTAH 5740 63146, 62719 SUNBEAM #4 22 2W 10S UTAH 6563 65463 SUNDOWN 20,29 2W 10S UTAH 6563 21810 SUNDOWN #2 15, 22 2W 10S UTAH 6560 30926 SUNNY SIDE NO.1 15, 22 2W 10S UTAH 6560 60621 SUNNY SIDE NO.2 (AMENDED) 15, 22 2W 10S UTAH 6560 60622 SUNNY SIDE NO.3 (AMENDED) 31 2W 10S JUAB 3782 24760 SUNNY SIDE 15, 22 2W 10S UTAH 6560 60619 SUNNY SIDE FRACTION (AMENDED) 22 2W 10S UTAH 6563 60611 SUNNY SIDE NO.5 22 2W 10S UTAH 6563 60612 SUNNY SIDE NO.6 22 2W 10S UTAH 6563 60613 SUNNY SIDE NO.7 22 2W 10S UTAH 6563 60614 SUNNY SIDE NO.8 5, 32 2W 10S, 11S JUAB 6052 65466 SUNRISE 21, 22 2W 10S UTAH 6767 62668 SUNRISE FRACTION 19 2W 10S UTAH, JUAB 3371 51987 SUNSET 255 Tintic Project April 25, 2024

Osisko Development Corp. Section Range Township County SurveyNo. State Of Utah TaxPropertyNo. Name 1,12 3W 10S UTAH 6024 60328 SUNSET 9, 16 2W 10S UTAH 6466 4374 SURPRISE 9 2W 10S UTAH 7171 21746 SURPRISE FRACTON 9 2W 10S UTAH 6466 60658 SURPRISE NO.2 29 2W 10S JUAB 6025 40049 TABOR 13 3W 10S JUAB 104 60983 TALISMAN 13 3W 10S JUAB 6545 21945 TALISMAN FRACTON 7,18 2W 10S JUAB 4536 43537 TAMARACK 25 3W 10S JUAB 331 4388 TENNESSEE REBEL 25 3W 10S JUAB 3338 4393 TENNESSEE REBEL FRACTION 7, 18 2W 10S JUAB 312 21909, 21898 TETRO 14, 23 2W 10S UTAH 6803 60415 THE LAMB NO.001 14 2W 10S UTAH 6801 60443 THE LAMB NO.002 23 2W 10S UTAH 6803 60416 THE LAMB NO.009 13 3W 10S JUAB 95 60204 THREE PLY 27,34 2W 9S UTAH 6516 60631 THUMB TACK 19 2W 10S JUAB 3435 51985 TIGER 31 2W 10S JUAB 3254 51934 TINA 36 3W 9S UTAH 264 60339 TINTIC 2, 10 2W 10S UTAH 6763 60533 TINTIC STANDARD NO.022 AMENDED 2, 3, 0 2W 10S UTAH 6763 60534 TINTIC STANDARD NO.024 AMENDED 2, 34 2W 9S, 10S UTAH 6763 60535 TINTIC STANDARD NO.028 AMENDED 2, 34 2W 9S, 10S UTAH 6763 21786 TINTIC STANDARD NO.029 AMENDED 2, 34 2W 9S, 10S UTAH 6763 60530 TINTIC STANDARD NO.030 AMENDED 2, 3, 34 2W 9S, 10S UTAH 6763 60730 TINTIC STANDARD NO.051 AMENDED 10, 15 2W 10S UTAH 6612 21802 TINTIC STANDARD NO.010 10, 15 2W 10S UTAH 6612 60607 TINTIC STANDARD NO.031 10, 15 2W 10S UTAH 6612 60608 TINTIC STANDARD NO.032 AMENDED 10, 15 2W 10S UTAH 6612 60609 TINTIC STANDARD NO.033 AMENDED 10, 15 2W 10S UTAH 6612 21801 TINTIC STANDARD NO.034 AMENDED 10, 11, 15 2W 10S UTAH 6612 60604 TINTIC STANDARD NO.035 AMENDED 11 2W 10S UTAH 6612 60605 TINTIC STANDARD NO.036 AMENDED 256 Tintic Project April 25, 2024

Osisko Development Corp. Section Range Township County SurveyNo. State Of Utah TaxPropertyNo. Name 10 2W 10S UTAH 6611 60591 TINTIC STANDARD NO.012 10 2W 10S UTAH 6611 60592 TINTIC STANDARD NO.013 10 2W 10S UTAH 6611 60593 TINTIC STANDARD NO.015 10 2W 10S UTAH 6611 60594 TINTIC STANDARD NO.016 2,10,11 2W 10S UTAH 6611 21804 TINTIC STANDARD NO.037 2,10,11,15 2W 10S UTAH 6611 60585 TINTIC STANDARD NO.038 2,11 2W 10S UTAH 6611 60586 TINTIC STANDARD NO.039 11 2W 10S UTAH 6612 60606 TINTIC STANDARD NO.044 AMENDED 10 2W 10S UTAH 6611 21803 TINTIC STANDARD NO.007 10 2W 10S UTAH 6611 60583 TINTIC STANDARD NO.008 10 2W 10S UTAH 6611 60588 TINTIC STANDARD NO.005 AMENDED 10 2W 10S UTAH 6611 60589 TINTIC STANDARD NO.006 AMENDED 10 2W 10S UTAH 6611 60584 TINTIC STANDARD NO.009 AMENDED 10 2W 10S UTAH 6611 21805 TINTIC STANDARD NO.011 AMENDED 3,10 2W 10S UTAH 6763 21787 TINTIC STANDARD NO.017 10 2W 10S UTAH 6763 60531 TINTIC STANDARD NO.018 2,10 2W 10S UTAH 6763 60532 TINTIC STANDARD NO.019 2,10 2W 10S UTAH 6763 65481 TINTIC STANDARD NO.040 3,10 2W 10S UTAH 6763 60537 TINTIC STANDARD NO.045 3 2W 10S UTAH 6763 60536 TINTIC STANDARD NO.046 3,10 2W 10S UTAH 6763 30983 TINTIC STANDARD NO.047 3 2W 10S UTAH 6763 60727 TINTIC STANDARD NO.048 3,10 2W 10S UTAH 6763 60728 TINTIC STANDARD NO.049 3, 34 2W 9S, 10S UTAH 6763 60729 TINTIC STANDARD NO.050 3,10 2W 10S UTAH 6763 60731 TINTIC STANDARD NO.052 9,10 2W 10S UTAH 6466 60659 TINTIC STANDARD NO.002 9 2W 10S UTAH 5974 60716 TIP TOP NO 2 7 2W 10S JUAB 4536 43524 TOLTEC 24 3W 10S JUAB 3625 60794 TOLTEC 18 2W 10S JUAB 4307 63162 TOWN VIEW 18 2W 10S JUAB 6672 25949 TOWN VIEW FRACTION 30 2W 10S JUAB 121 4385 TRAIL 3 2W 10S UTAH 6463 60660 TRESTLE 18 2W 10S JUAB 4600 60993 TRIANGULAR 27, 28 2W 10S UTAH 6073 19288 TRIXY 28 2W 10S UTAH 6073 62715 TRUMP 257 Tintic Project April 25, 2024

Osisko Development Corp. Section Range Township County SurveyNo. State Of Utah TaxPropertyNo. Name 4,9 2W 10S UTAH 6463 63431 TUNNEL NO.3 3,4,9,10 2W 10S UTAH 6463 63388 TUNNEL NO.4 4 2W 10S UTAH 4126 60725 TUNNEL SITE MINING CLAIM 29, 30 2W 10S JUAB 4519 24759 TURK 16 2W 10S UTAH 5734 64975 UNCLE ANDREAS 16 2W 10S UTAH 5795 66462 UNCLE ANDREAS NO.2 18 2W 10S UTAH, JUAB 321 40185 UNCLE SAM 24 3W 10S JUAB 188 65491 UNION 15, 16 2W 10S UTAH 5559 21851 UNION B 16 2W 10S UTAH 6204 60708 UNION NO.2 30 2W 10S JUAB 116 40097 VALEJO 13,24 3W 10S JUAB 100 60970 VALLEY 16 2W 10S UTAH 5480 21853 VEGA 9 2W 10S UTAH 5974 60717 VENUS 30 2W 10S JUAB 4392 51988 VENUS 21 2W 9S UTAH 6881 36301 VENUS FRACTION 20, 29 2W 10S UTAH 5588 19301 VERMONT 21, 28 2W 10S UTAH 6456 19282 VERN NO.1 21, 28 2W 10S UTAH 6456 62701 VERN NO.2 28 2W 10S UTAH 6456 62702 VERN NO.3 28 2W 10S UTAH 6456 62703 VERN NO.4 28 2W 10S UTAH 6456 62704 VERN NO.5 28 2W 10S UTAH 6456 62705 VERN NO.6 29, 30 2W 10S UTAH 4480 40411 VICTOR 30 2W 10S JUAB 238 40314 VICTORY LODE 12 3W 10S JUAB 103 21906 VOLTAIRE MS 20 2W 10S UTAH 3825 40415 W. J. BRYAN 33 2W 9S UTAH 6516 60231 W PINYON 28,33 2W 9S UTAH 6484 60244 W PINYON NO.7 33 2W 9S UTAH 6402 60207 W PINYON NO.2 33 2W 9S UTAH 6402 60311 W PINYON NO.3 33 2W 9S UTAH 6402 60313 W PINYON NO.4 28,33 2W 9S UTAH 6402 60312 W PINYON NO.5 28,33 2W 9S UTAH 6402 60314 W PINYON NO.6 33 2W 9S UTAH 6516 60205, 65501 W PINYON NO.8 33 2W 9S UTAH 6516 60233 W PINYON NO.9 18 2W 10S JUAB 163 21943 W.W.C.MS 15 2W 10S UTAH 6787 21778 WANDERER NUMBER.9 AMENDED 8, 9, 16, 17 2W 10S UTAH 5736 60719 WATER GULCH 258 Tintic Project April 25, 2024

Osisko Development Corp. Section Range Township County SurveyNo. State Of Utah TaxPropertyNo. Name 3 2W 10S UTAH 6457 21831 WATER LILLIE 18,19 2W 10S JUAB 3722 62822 WATSON 19 2W 10S JUAB 3723 62823 WATSON EXTENSION 9, 16 2W 10S UTAH 6438 40432 WEBER 16 2W 10S UTAH 7156 21747 WEDGE 16 2W 10S UTAH 4668 62737 WELLER FRACTION 25, 36 3W 10S JUAB 3296 40305 WEST BOWER 13,24 3W 10S JUAB 90 21944 WEST BULLION 13 3W 10S JUAB 6082 65515 WEST EMMA 30 2W 10S JUAB 319 40107 WEST MAMMOTH 30, 31 2W 10S JUAB 233 4367 WEST STAR 36 3W 10S JUAB 337 51936 WEST SWANSEA 18,19 2W 10S JUAB 6566 60806 WHISPERING WILLIE 30 2W 10S JUAB 4163 51933 WHITE DRAGON 27, 28 2W 10S UTAH 6766 62676 WHITE ROSE NO.10 AMENDED 21 2W 10S UTAH 6766 62679 WHITE ROSE NO.5 AMENDED 27, 28 2W 10S UTAH 6766 19266 WHITE ROSE NO.4 21, 28 2W 10S UTAH 6766 62675 WHITE ROSE NO.6 21 2W 10S UTAH 6766 62674 WHITE ROSE NO.7 16 2W 10S UTAH 4654 21796 WHITE STALLION NO.2 16 2W 10S UTAH 6527 60624 WHITE WING #2 10, 15 2W 10S UTAH 6466 60651 WHITE WING NO.006 10 2W 10S UTAH 6466 60652 WHITE WING NO.007 10, 15 2W 10S UTAH 6466 60653 WHITE WING NO.008 10, 15 2W 10S UTAH 6466 60654 WHITE WING NO.009 31 2W 10S JUAB 3240 51922 WILLIE GUNDRY 21, 22 2W 10S UTAH 6766 62683 WITHE ROSE 21, 22 2W 10S UTAH 6766 19267 WITHE ROSE FRACTION 21, 22 2W 10S UTAH 6766 62677 WITHE ROSE NO.1 21, 22 2W 10S UTAH 6766 62678 WITHE ROSE NO.2 21, 22, 27, 28 2W 10S UTAH 6766 62679 WITHE ROSE NO.3 29, 30 2W 10S UTAH, JUAB 244 40024 WOLF 7 2W 10S UTAH, JUAB 6001 60972, 76573 WONDER NO.1 6,7 2W 10S UTAH, JUAB 6001 48712, 76574 WONDER NO.2 7 2W 10S UTAH, JUAB 6001 48713, 76575 WONDER NO.3 15 2W 10S UTAH 6466 60646 WONDERER # 1 15 2W 10S UTAH 6466 60647 WONDERER # 2 259 Tintic Project April 25, 2024

Osisko Development Corp. Section Range Township County SurveyNo. State Of Utah TaxPropertyNo. Name 15 2W 10S UTAH 6466 60648 WONDERER # 3 15 2W 10S UTAH 6466 60649 WONDERER # 4 11, 15 2W 10S UTAH 6466 21822 WONDERER AMENDED 15, 22 2W 10S UTAH 6466 60650 WONDERER AMENDED NO.7 15 2W 10S UTAH 6466 21821 WONDERER NO.8 15 2W 10S UTAH 6466 60644 WONDERER NO 5 - X AMENDED 15 2W 10S UTAH 6466 60645 WONDERER NO 6 - X AMENDED 20 2W 10S UTAH 5586 19302 WYMA 29 2W 10S JUAB 6090 40042 WYOMING 8 2W 10S UTAH 52 21861 WYOMING SILVER 17, 20 2W 10S UTAH 3794 40325 YANKEE 17, 20 2W 10S UTAH 3794 40326 YANKEE #2 17, 20 2W 10S UTAH 3794 40327 YANKEE #3 22 2W 10S UTAH 6563 60615 ZENITH FRACTION 14, 22 2W 10S UTAH 6752 21794 ZENITH NO.001 22 2W 10S UTAH 6752 60572 ZENITH NO.011 22 2W 10S UTAH 6752 60573 ZENITH NO.013 22, 27 2W 10S UTAH 6752 60574 ZENITH NO.015 22 2W 10S UTAH 6752 60575 ZENITH NO.016 22, 27 2W 10S UTAH 6752 60576 ZENITH NO.017 22, 27 2W 10S UTAH 6752 60577 ZENITH NO.018 14, 22 2W 10S UTAH 6752 21793 ZENITH NO.019 22 2W 10S UTAH 6752 60567 ZENITH NO.002 14, 22 2W 10S UTAH 6752 60570 ZENITH NO.003 14, 22 2W 10S UTAH 6752 60571 ZENITH NO.005 14, 22 2W 10S UTAH 6752 60568 ZENITH NO.007 14, 22 2W 10S UTAH 6752 60569 ZENITH NO.009 13,24 3W 10S JUAB 99 21955 ZULU 21, 28 2W 10S UTAH 5774 21847 ZUMA FRACTION #1 21, 28, 29 2W 10S UTAH 5735 21849 ZUMA NO.1 21 2W 10S UTAH 5735 60720 ZUMA NO.2 20, 21, 28, 29 2W 10S UTAH 5735 60721 ZUMA NO.3 21 2W 10S UTAH 5735 63060 ZUMA NO.4 260 Tintic Project April 25, 2024