EX-99.22 23 rio-ex9922_11.htm EX-99.22 rio-ex9922_11.htm

Exhibit 99.22

Notice to ASX

 

 

Rio Tinto Exploration Update – copper-gold mineralisation discovered in the Paterson Province in the far east Pilbara region of Western Australia

 

27 February 2019

 

Rio Tinto has discovered copper-gold mineralisation at the Winu project in the Yeneena Basin of the Paterson Province in Western Australia. The Winu project is located approximately 130 km north of the Telfer mine and 350 km southeast of Port Hedland.

 

The discovery was made by Rio Tinto Exploration (RTX) who are conducting a program targeted at finding copper mineralisation in the Paterson Province. The exploration program consisted of eight reverse circulation (RC) and twenty diamond holes drilled on exploration licence E45/4833 between December 2017 and the end of 2018, totalling 13,286 metres (1,473 m RC and 11,813 m diamond). Assays for all RC holes and fourteen diamond holes were received and validated at the time of preparing this release. Assays are pending for the remaining six diamond holes (partially or totally); partial results are included for two holes. Diamond drilling recommenced in mid-January 2019. Four holes have been completed for 1,409 metres during 2019 and are pending assay results.

 

Assay results to date indicate relatively wide intersections of copper mineralisation associated with gold and silver. Vein style copper, gold and silver mineralisation beneath relatively shallow cover which ranges from 50 to 100 m. The mineralisation remains open at depth and to the east, north and south.

 

While results are encouraging, the exploration project is still at an early stage and drilling to date does not allow sufficient understanding of the mineralised body to assess the potential size or quality of the mineralisation nor to enable estimation of a Mineral Resource. The assessment and interpretation of existing data is ongoing and will be used to help guide the drilling in 2019.  Significant mineralised drill hole intercepts above 0.4% Cu or 0.4 g/t Au are shown in Table 1 below. More detailed mineralised intercepts are provided in Table 2.

 

Table 1:Significant mineralised drill hole intercepts >0.4% Cu or >0.4 g/t Au

Drill hole

Down hole (m)

Down hole length (m)

Copper (Cu %)

Gold   (Au g/t)

Silver    (Ag g/t)

From

To

RC17PAW0001

70

174

104

0.80

0.28

4.35

RC17PAW0002

193

204

11

0.47

0.21

2.60

RC18WIN0002

105

123

18

0.45

0.31

2.80

RC18WIN0002

158

219

61

0.57

0.52

4.23

RC18WIN0003

77

148

71

1.02

0.49

5.14

WIDI0007

60

120

60

1.03

1.22

4.30

WINU0001

135

156

21

1.00

0.72

7.58

WINU0001

163

174

11

0.80

0.39

4.81

WINU0003

140

579

439

0.42

0.32

2.45

WINU0003

656

664

8

0.50

0.38

2.23

WINU0003

710

719

9

0.48

0.67

2.19


Page 1 of 15


Drill hole

Down hole (m)

Down hole length (m)

Copper (Cu %)

Gold   (Au g/t)

Silver    (Ag g/t)

From

To

WINU0004

88

233

145

0.43

0.48

3.09

WINU0006

68

809

741

0.45

0.52

2.94

WINU0007

244

274

30

0.40

0.21

2.40

WINU0007

318

663

345

0.41

0.31

2.68

WINU0008

197

214

17

0.77

0.76

4.56

WINU0009

179

191

12

0.54

0.36

3.75

WINU0009

604

619

15

0.76

0.25

4.71

WINU0010

122

135

13

0.71

0.54

3.66

WINU0010

222

257

35

0.97

0.46

6.50

WINU0011

276

775

499

0.40

0.20

2.33

WINU0012

95

241

146

0.43

0.39

2.81

WINU0013

91

160

69

0.51

0.26

3.94

WINU0013

215

687

472

0.43

0.35

2.69

WINU0014

78

99

21

0.41

0.11

2.30

WINU0014

110

121

11

0.45

0.19

1.91

WINU0014

185

377

192

0.40

0.37

2.69

WINU0014

450

465

15

1.08

0.49

5.10

WINU0015

100

211

111

0.41

0.22

2.53

WINU0015

226

263

37

0.69

0.23

2.41

WINU0017

326

522

196

0.46

0.23

2.60

WINU0018

213

456

243

0.36

0.21

2.25

WINU0019

100

204

104

0.57

0.56

3.37

WINU0024

97

258

161

0.57

0.46

3.25

 

The Winu exploration camp is located approximately 200 km by gravel and sand track from the Great Northern Highway. The camp is a seven hour drive from Port Hedland, which poses a significant safety risk. A gravel airstrip is being constructed at Winu for emergency response purposes. In addition, the sand section of the track will be upgraded for logistics supply purposes.

 

In conjunction with the ongoing work at Winu, RTX will continue to explore its adjacent wholly owned licences and joint venture licences within the Paterson Province.

 

Information on the criteria listed in the JORC Table 1 checklist in The Australasian Code for the Reporting of Exploration Results, Mineral Resources and Ore Reserves (the JORC Code, 2012 Edition) relating to these exploration results is attached to this release.

 

Project History

 

The Winu project is located within the Exploration Licence E45/4833 which lies within both the Nyangumarta and Martu Native Title Determination areas. It is approximately 130 km north of the Telfer deposit in the Paterson Province of WA (Figure 1). Target generation began in 2016 with regional interpretation, area selection,


Page 2 of 15


tenement application followed by additional geophysical surveys in 2017.  The ground target testing began in late 2017 with the completion of two RC drill holes.

 

An 80-person temporary exploration camp was constructed in stages throughout 2018.

 

Competent Persons Statement

 

The information in this report that relates to Exploration Results is based on information compiled by Dr Jacques Batumike Mwandulo who is a Member of the Australasian Institute of Mining and Metallurgy (MAusIMM) and has sufficient experience which is relevant to the style of mineralisation and type of deposit under consideration and to the activity to which he is undertaking to qualify as a competent person as defined in the 2012 edition of the “Australasian Code for Reporting of Exploration Results, Mineral Resources and Ore Reserves”. Dr Jacques Batumike Mwandulo is a full-time employee of Rio Tinto Exploration and consents to the inclusion in the report of the matters based on his information in the form and context in which it appears.

 

Table 2: Detailed intercepts above >0.2% Cu or 0.2 g.t Au

 

Drill hole

Down hole (m)

Down hole length (m)

Copper (Cu %)

Gold   (Au g/t)

Silver    (Ag g/t)

From

To

RC17PAW0001

70

174

104

0.80

0.28

4.35

RC17PAW0001 incl

72

83

11

2.23

0.24

8.44

RC17PAW0001 incl

143

174

31

1.13

0.35

7.02

RC17PAW0002

71

79

8

0.74

0.31

3.23

RC17PAW0002

98

144

46

0.44

0.29

2.21

RC17PAW0002 incl

98

120

24

0.50

0.32

2.14

RC17PAW0002

173

182

9

0.44

0.53

1.80

RC17PAW0002

193

204

11

0.47

0.21

2.60

RC18WIN0001

118

133

15

0.24

0.18

0.76

RC18WIN0001

190

204

14

0.24

0.23

1.08

RC18WIN0002

105

123

18

0.45

0.31

2.80

RC18WIN0002

158

219

61

0.57

0.52

4.23

RC18WIN0003

77

148

71

1.02

0.49

5.14

RC18WIN0003 incl

77

90

13

2.07

0.52

5.52

RC18WIN0003 incl

104

136

32

1.15

0.53

6.59

WB18WIN0002

98

111

13

0.20

0.12

1.40

WB18WIN0002

130

142

12

0.27

0.20

1.76

WIDI0007

60

120

60

1.03

1.22

4.30

WIDI0007 incl

82

102

20

1.05

1.96

5.33

WIDI0007 incl

105

120

15

1.94

0.85

4.63

WINU0001

75

481

406

0.29

0.24

1.90

WINU0001 incl

135

156

21

1.00

0.72

7.58

WINU0001 incl

163

174

11

0.80

0.39

4.81

WINU0003

140

579

439

0.42

0.32

2.45

WINU0003 incl

157

174

17

0.81

0.36

5.01

WINU0003 incl

194

206

12

0.57

0.59

3.44

WINU0003 incl

299

306

7

0.98

0.54

4.40

WINU0003 incl

315

321

6

2.78

0.78

17.31

WINU0003 incl

452

481

29

0.76

0.40

3.84

WINU0003

656

664

8

0.50

0.38

2.23

Page 3 of 15


Drill hole

Down hole (m)

Down hole length (m)

Copper (Cu %)

Gold   (Au g/t)

Silver    (Ag g/t)

From

To

WINU0003

710

719

9

0.48

0.67

2.19

WINU0004

88

233

145

0.43

0.48

3.09

WINU0004 incl

88

94

6

4.69

2.52

26.41

WINU0006

46

809

763

0.44

0.65

2.88

WINU0006 incl

46

100

54

0.25

5.43

1.75

WINU0006 incl

111

304

193

0.83

0.47

5.49

WINU0006 incl

339

350

11

1.60

1.06

11.36

WINU0006 incl

478

491

13

0.79

0.40

5.42

WINU0006 incl

520

528

8

0.87

0.57

5.84

WINU0006 incl

625

635

10

0.77

0.34

5.83

WINU0006 incl

729

735

6

0.99

0.64

3.27

WINU0007

211

218

7

0.43

0.12

3.13

WINU0007

244

274

30

0.40

0.21

2.40

WINU0007

278

283

5

0.42

0.17

3.13

WINU0007

285

292

7

0.61

0.20

3.15

WINU0007

318

663

345

0.41

0.31

2.68

WINU0007 incl

338

348

10

1.66

0.27

11.34

WINU0007 incl

417

430

13

0.99

0.19

6.80

WINU0007 incl

529

546

17

0.37

1.43

2.26

WINU0007 incl

576

590

14

0.65

0.19

3.13

WINU0008

96

358

262

0.27

0.30

1.61

WINU0008 incl

197

214

17

0.77

0.76

4.56

WINU0009

73

83

10

0.24

0.04

0.76

WINU0009

104

326

222

0.20

0.18

1.40

WINU0009 incl

113

120

7

1.06

0.37

3.22

WINU0009 incl

165

172

7

0.53

0.59

3.44

WINU0009 incl

179

191

12

0.54

0.36

3.75

WINU0009

338

662

324

0.25

0.16

1.48

WINU0009 incl

344

349

5

0.86

0.27

3.79

WINU0009 incl

604

619

15

0.76

0.25

4.71

WINU0010

109

474

365

0.27

0.24

1.64

WINU0010 incl

122

135

13

0.71

0.54

3.66

WINU0010 incl

222

257

35

0.97

0.46

6.50

WINU0011

112

130

18

0.22

0.74

0.81

WINU0011

276

775

499

0.40

0.20

2.33

WINU0011 incl

556

570

14

1.25

0.52

8.66

WINU0011 incl

627

648

21

0.98

0.28

5.88

WINU0011 incl

696

719

23

1.03

0.24

4.37

WINU0012

94

396

302

0.25

0.27

1.55

WINU0012

95

241

146

0.43

0.39

2.81

WINU0013

91

160

69

0.51

0.26

3.94

WINU0013

215

687

472

0.43

0.35

2.69

WINU0014

78

99

21

0.41

0.11

2.30

WINU0014

110

121

11

0.45

0.19

1.91

Page 4 of 15


Drill hole

Down hole (m)

Down hole length (m)

Copper (Cu %)

Gold   (Au g/t)

Silver    (Ag g/t)

From

To

WINU0014

161

170

9

0.46

0.29

2.73

WINU0014

185

377

192

0.40

0.37

2.69

WINU0014

399

408

9

0.51

0.29

2.49

WINU0014

450

465

15

1.08

0.49

5.10

WINU0015

94

496

402

0.24

0.18

1.18

WINU0015

100

211

111

0.41

0.22

2.53

WINU0015

226

263

37

0.69

0.23

2.41

WINU0017

326

522

196

0.46

0.23

2.6

WINU0018

213

456

243

0.36

0.21

2.25

WINU0019

100

204

104

0.57

0.56

3.37

WINU0024

97

258

161

0.57

0.46

3.25

WINU0024 incl

97

117

20

1.01

1.10

3.78

WINU0024 incl

191

226

35

0.74

0.39

4.64

 


Page 5 of 15


Figure 1:  Location map of the Winu project

 

Figure 2:  Drill collar location plan for Winu with section line locations



Page 6 of 15


Figure 3:  Cross sections through Winu mineralisation

 


Page 7 of 15


Winu Project: JORC Table 1

The following table provides a summary of important assessment and reporting criteria used at the Winu project ifor the reporting of Exploration Results in accordance with the Table 1 checklist in The Australasian Code for the Reporting of Exploration Results, Mineral Resources and Ore Reserves (The JORC Code, 2012 Edition). Criteria in each section apply to all preceding and succeeding sections.

SECTION 1 SAMPLING TECHNIQUES AND DATA

Criteria

Commentary

Sampling techniques

Reverse circulation drilling samples were collected from a cone split on the cyclone on a 1-m interval. The sample consisted of the 10% of the drilled meter and its weight varied from 2 to 5 kg. Heavy samples were split manually using a single tier riffle splitter to produce a manageable sample weight.

PQ and HQ diamond core was drilled on a 6-m run. The core was cut using an automated core-cutter and sample was collected on a 1-m interval half core.

Drilling techniques

The drilling consisted of reverse circulation with face sampling bit and triple tubed diamond drilling from surface.

The drill holes were generally cased from 30 m progressing from PQ to HQ at 160 m on average; however, exact depths vary from hole to hole.

The core was oriented using the ACT III RD tool. At the end of each run, the low side of the core was marked by the drillers and this was used at the site for marking the whole drill core with a reference line.

Drill sample recovery

Core recovery was measured and recorded continuously from the start of casing to the end of the hole for every drill hole. Each run of 6 m length was marked by a core block which provided the depth, the core drilled and the core recovered.

Generally the core recovery was >99%.

RC samples were weighted, the hole was flushed after each 1m sample and the sample weights were compared for identify any loss. Generally, the sample weights were comparable.

Logging

Detailed descriptions of core were logged qualitatively for lithological composition and texture, structures, veining and sulphide composition. In addition, a quantitative estimate was also done for some minerals including sulphides.

Structural and geotechnical measurements were also recorded and uploaded into Acquire.

All the drilled holes were logged before sampling.

The core was photographed both dry and wet inside the core trays.

The logging of the RC chips was done after sieving and washing of the material collected from the cyclone.

Sub-sampling techniques and sample preparation

Diamond core was sawn into two, and half was collected in bag and submitted for analysis, the other half was kept in tray and stored. The core was sampled at 1m intervals with breaks for major geological changes. Intervals generally range from 0.5 m to 1m.

The diamond half core and RC samples were sent to ALS laboratory, where they were dried and crushed to 2mm with 70% pass and then split using a rotary splitter to produce a 750 g sub-sample. The crushed sub-sample was pulverised with 85% passing 75 um using a LM2 mill and a 30 to 50 g sample taken for analysis.

A portion of the 2mm sized material was used for VNIR/SWIR spectra readings, which were sent to AusSpec for interpretation.

Duplicates samples were collected at each stage of the preparation, with a rate of 1:50 (field supplicates) or 1:20 (crush and pulp duplicates) samples. Duplicate results show acceptable levels of precision for the style of mineralisation.

Sample sizes are considered appropriate for the style of mineralisation.

Page 8 of 15


Quality of assay data

and laboratory tests

All samples were submitted to ALS Laboratory in Perth.

51 elements were analysed using 4-acid digestion followed by ICP-OES/MS measurements, including qualitative Au, Pt and Pd.

30 to 50g of sample were used for Au analysis by fire assay with AAS finish.

Portable XRF analysis on pulp for Cr, Nb, S, Si, Ta, Ti, Y and Zr was done using a Delta and Vanta Olympus instrument.

Quality control samples consisted of field duplicates (1:50), crush duplicates (1:20), pulp duplicates (1:20), blanks (1:20) and certified reference materials (3:100). All the results were checked in Acquire database before being used, and all the analysed batches performed within acceptable accuracy and precision limits for the style of mineralisation. No material contamination was noted in the laboratory process.

Verification of sampling and assaying

All the sample intervals were visually verified using high quality core photography through Imago, and some selected samples were taken inside the mineralised interval for optical microscopy by qualified petrologists.

No adjustment was done on the assay data that are electronically uploaded from the laboratory to the database.

The drill core logging is managed by a computerised system and strict validation steps were followed.

The data are stored in a secured database with restricted access.

There are two twinned holes (one RC and one diamond) that were drilled for validation of the assays. The results from these holes indicate that there is no bias present due to drilling method.

In addition, a systematic analysis of duplicate samples was carried out at each stage of sampling including field, crush and pulp duplicates. The results from the duplicates were within acceptable range for this type of mineralisation. The results from blanks did not indicate contamination during the laboratory procedure.

Location of data points

Drill hole collars were surveyed using a handheld Garmin GPS with an accuracy of 5 m and the data were recorded on a spread sheet and uploaded into an Acquire database, pending more accurate surveying to be done in 2019.

The topography is relatively flat with average elevation of 240 m.

The data for the collars are provided in the Geocentric Datum of Australia (GDA94 zone 51).

Downhole surveys were completed every 10, 25 or 50 m using a Reflex EZ Gyro or Reflex SPRINT-IQ.

Data spacing and distribution

The drill hole spacing is 130 to 150 m across strike by 300 m along strike (between lines).

The current drilling does not provide sufficient information for estimation of a Mineral Resource.

The intercepted mineralisation is still open to the east, north, south and at depth and further drilling will continue during 2019.

The reported results are from eight RC holes and sixteen completed diamond drill holes, including partial results for two 2018 diamond drill holes.

Figure 2 illustrates all 2018 drillholes, including those pending assay results, as well as the 4 diamond drill holes which have been drilled in 2019 and are also pending results.

Ten drill holes were abandonded prior to reaching mineralisation as a result of drilling difficulties in the Permian cover sequence. These drill holes are not included in this release.

No compositing has been applied to the samples.

Page 9 of 15


Orientation of data in relation to

geological structure

Drilling is mainly orientated perpendicular to the main structural trend of the area; however, there are multiple mineralisation events and there is insufficient data to confirm the geological model.

 

Sample security

Samples in calico bags are stored on site in enclosed stillages and transported via road on trucks from the site to ALS laboratory in Perth via Port Hedland entrepot (owned by Centurion, CFG Group).

The diamond sample intervals were verified against the recorded core lost in the drilling pods.

Sample numbers were generated directly from the database after validation by visual observation of core.

Each sample was given a barcode at the laboratory and the laboratory reconciles the received sample list with physical samples. Barcode readers were used at the different stages of the analytical process.

The laboratory uses a LIMS system that further ensures the integrity of the results.

Audits or reviews

No external audits have been performed at this early stage of the project.

The database containing the data related to all Rio Tinto exploration programs is internally checked and reviewed periodically and no issue has been found for the reported data.


Page 10 of 15


SECTION 2 REPORTING OF EXPLORATION RESULTS

Criteria

Commentary

Mineral tenement and land tenure status

All Rio Tinto Exploration tenements are kept with respect to the legislation in terms of obligations including minimum expenditure. This project is located within Exploration Licence E45/4833, which is 100 % owned by RTX and expires on the 12th of October 2022.

Exploration done by other parties

No exploration has been carried out in the Winu area prior to RTX work in 2016.

Geology

The prospect is located on the Anketell Shelf of the Yeneena Basin, a Neoproterozoic sequence of metasedimentary rocks and granitoids that is entirely covered by Phanerozoic sediments, up to 100 m thick in the Winu area.

The main lithologies intercepted by the current drilling at Winu include metasedimentary rocks (quartzites, metasandstones, metasiltstones and metapelites), unmetamorphosed sedimentary cover rocks (conglomerates, arkoses, psammites and mudstones), granite and dolerite. Host rocks to copper-gold mineralisation are fine to medium-grained subarkosic metasandstones and biotite-rich metasiltstones.

The mineralisation is predominantly vein controlled. Sulphides include chalcopyrite, chalcocite, pyrite, pyrrothite, molybdenite, bornite, scheelite, bismuthite and wulframite. At least six generations of veins are identified and characterised each by different mineralogical assemblages and textures. The main mineralisation event is associated with quartz-sulphide (K-feldspar) and sulphide-carbonate veins with dominantly K-feldspar, muscovite, biotite and/or chlorite wallrock alteration.

Primary sulphide mineralisation is overlain by a supergene blanket containing secondary copper minerals as well as native copper in places.

 

Drill hole Information

Appendix 1 provides details of drill hole coordinates, orientations and length for all drill holes, including those pending validated results.

Data aggregation methods

The average grades presented in this report are all length-weighted averages above a 0.2% Cu, 0.2 g/t Au, 0.4% Cu or 0.4 g/t Au cut-off as noted.

Relationship between mineralisation widths and intercept lengths

Insufficient data is available to confirm the geological model and as such all results are reported in apparent width; the true width is still unknown.

 


Page 11 of 15


Diagrams

Plans are included in the release as below:

Location Map (Figure 1),  Drillhole collar plan (Figure 2) and Winu Cross sections (Figure 3 and Figure 4)  

Balanced reporting

This is the first release of available exploration results for this deposit.

Results for all available holes are reported.

Other substantive exploration data

Specific gravity measurements were taken on 20 cm of solid core for every 20 m, representing different lithologies and mineralised intervals. The measurement used the hydrostatic/gravimetric method (Archimeds Principle of buoyancy).

Magnetic susceptibility was measured for each sample using KT-10 (kappameter) instrument.

Geophysical surveys were carried out over the deposit area including airborne electromagnetics, ground gravity, induced polarisation/resistivity, passive seismic, and downhole density, gamma, conductivity, resistivity, induced polarisation, magnetic susceptibility and acoustic televiewer.

Geometallurgical characterisation was conducted on the first RC holes, which indicated satisfactory results however further tests are required to confirm potential recovery.

WorldView2 images were acquired for help in better planning and reporting of the exploration program.

Further work

RTX is still evaluating and interpreting the results from the 2018 work program which will help guide further work in 2019.

The results presented here indicate the mineralisation is not closed off by the 2018 drilling.

Preliminary metallurigical test work is planned for 2019.

In addition to the ongoing work at Winu, RTX will conduct exploration within the broader Paterson Province on its wholly owned licences and joint venture licences during 2019.

 


Page 12 of 15


 

Appendix 1Drill hole coordinates, orientations and depths

The data for the collars are provided in the Geocentric Datum of Australia (GDA94 zone 51)

Drill hole

Easting

(mE)

Northing

(mN)

Elevation

(mRL)

Down hole depth (m)

Dip

Azimuth

Hole type

Hole Status

RC17PAW0001

369093.00

7708170.00

246.00

174

60

260

RC

Assays Received

RC17PAW0002

369020.00

7708163.00

245.00

216

60

260

RC

Assays Received

RC18WIN0001

369390.00

7708180.00

248.00

213

70

260

RC

Assays Received

RC18WIN0002

368936.00

7708477.00

249.00

246

70

80

RC

Assays Received

RC18WIN0003

369104.00

7707867.00

245.00

150

70

260

RC

Assays Received

WB18WIN0001

370866.00

7707009.00

248.00

141

90

0

RC

Abandoned

WB18WIN0002

368808.00

7708143.00

246.00

150

90

0

RC

Assays Received

WIDI0007

369110.00

7707564.00

248.00

120

90

0

RC

Assays Received

WINU0001

369088.00

7708169.00

245.00

600.8

60

260

DD

Assays Received

WINU0002

369242.00

7708179.00

248.00

56.2

60

260

DD

Abandoned

WINU0003

369241.00

7708178.00

246.00

770.4

60

260

DD

Assays Received

WINU0004

369102.00

7707867.00

245.00

520.1

60

260

DD

Assays Received

WINU0005

368944.00

7708166.00

245.00

147.9

60

80

DD

Abandoned

WINU0006

368939.00

7708158.00

245.00

809.8

60

80

DD

Assays Received

WINU0007

369402.00

7707881.00

245.00

723.6

60

260

DD

Assays Received

WINU0008

368945.00

7708167.00

253.00

555.8

60

260

DD

Assays Received

WINU0009

368933.00

7708471.00

248.00

685.3

60

80

DD

Assays Received

WINU0010

369279.00

7707575.00

247.00

513.3

60

260

DD

Assays Received

WINU0011

369392.00

7708183.00

253.00

807.4

70

260

DD

Assays Received

WINU0012

369192.00

7707566.00

267.00

473.8

70

260

DD

Assays Received

WINU0013

368934.00

7708477.00

254.00

686.6

70

80

DD

Assays Received

WINU0014

369258.00

7707869.00

263.00

492.9

60

260

DD

Assays Received

WINU0015

369314.00

7707284.00

268.00

534.8

60

260

DD

Assays Received

WINU0016

368951.00

7707856.00

250.00

56.2

60

80

DD

Abandoned

WINU0017

368954.00

7707861.00

254.00

531.8

60

80

DD

Partial Assays Received

WINU0018

369471.00

7707294.00

244.00

501.8

60

260

DD

Partial Assays Received

WINU0019

369275.00

7707574.00

268.00

204

60

260

RC

Assays Received

WINU0020

369419.00

7707579.00

255.00

1000

60

260

DD

Assays Pending

WINU0021

368988.00

7707559.00

247.00

61.6

60

260

DD

Abandoned

WINU0022

368988.00

7707556.00

248.00

90

60

260

DD

Abandoned

WINU0023

369276.00

7707573.00

254.00

38.4

60

260

DD

Abandoned

WINU0024

369280.00

7707578.00

268.00

269.9

60

260

DD

Assays Received

WINU0025

368988.00

7707554.00

247.00

90.6

60

260

DD

Abandoned

WINU0026

369330.00

7707131.00

248.00

429.6

60

260

DD

Assays Pending

WINU0027

369171.00

7707269.00

245.00

32.2

60

260

DD

Abandoned

WINU0028

369483.00

7707146.00

246.00

546.8

60

260

DD

Assays Pending

WINU0029

368801.00

7707863.00

248.00

358.6

60

260

DD

Assays Pending

WINU0030

368783.00

7708460.00

245.00

60.4

60

260

DD

Abandoned

WINU0031

369612.00

7707311.00

252.00

476.7

60

260

DD

Assays Pending

WINU0033

368789.00

7708465.00

252.00

0

60

260

DD

Abandoned

WINU0034

369547.00

7706865.00

258.00

395.1

60

260

DD

Assays Pending

Page 13 of 15


Drill hole

Easting

(mE)

Northing

(mN)

Elevation

(mRL)

Down hole depth (m)

Dip

Azimuth

Hole type

Hole Status

WINU0035

369673.00

7706408.00

257.00

282

60

260

DD

Assays Pending

WINU0036

369683.00

7706800.00

258.00

255.1

60

260

DD

Assays Pending

 

 


Page 14 of 15


Contacts

 

media.enquiries@riotinto.com

riotinto.com  

  Follow @RioTinto on Twitter

 

Media Relations United Kingdon

Illtud Harri

T +44 20 7781 1152

M +44 7920 503 600

 

David Outhwaite

T +44 20 7781 1623

M +44 7787 597 493

 

Media Relations, Americas

Matthew Klar

T +1 514 608 4429

 

Media Relations, Asia

Grant Donald

T +65 6679 9290

M +65 9722 6028

 

Media Relations, Australia

Jonathan Rose

T +61 3 9283 3088

M +61 447 028 913

 

Matt Chambers

T +61 (0) 3 9283 3087

M +61 433 525 739

 

Jesse Riseborough

T +61 8 6211 6013

M +61 436 653 412

 

 

 

 

 

 

Investor Relations, United Kingdom

John Smelt

T +44 20 7781 1654

M +44 7879 642 675

 

David Ovington

T +44 20 7781 2051

M +44 7920 010 978

 

Nick Parkinson

T +44 20 7781 1552

M +44 7810 657 556

 

 

Investor Relations, Australia

Natalie Worley

T +61 3 9283 3063

M +61 409 210 462

 

Rachel Storrs

T +61 3 9283 3628

M +61 417 401 018

 

 

 

 

Rio Tinto plc

6 St James’s Square

London SW1Y 4AD

United Kingdom

 

T +44 20 7781 2000
Registered in England

No. 719885

Rio Tinto Limited

Level 7, 360 Collins Street

Melbourne 3000

Australia

 

T +61 3 9283 3333

Registered in Australia

ABN 96 004 458 404