COMMITMENTS AND CONTINGENCIES: - Others (Details) S/ in Millions, $ in Millions				1 Months Ended						6 Months Ended
	Feb. 20, 2020 MWh	Jul. 15, 2019 complaint	Jul. 08, 2019 USD ($) T	Jun. 30, 2022 USD ($)	Jun. 30, 2021 USD ($)	Jun. 30, 2018 USD ($) T	May 31, 2016 MW	Jul. 31, 2014 MW	Jun. 30, 2014 MW	Jun. 30, 2022 USD ($) person item	Jun. 30, 2022 PEN (S/) person item	Dec. 31, 2021 USD ($)
Other commitments:
Property net book value				$ 9,521.8	$ 9,456.1					$ 9,521.8		$ 9,464.4
Commitment for capital projects										437.0
Tia Maria | Peru
Other commitments:
Project budget			$ 1,400.0							1,400.0
Number Of Complaints | complaint		3
Amount spend as of the current date				$ 333.5						333.5
Annual production ( in tons) | T			120,000
Michiquillay
Other commitments:
Pre-operational period				12 years
Extended pre-operational period				3 years
Investment in projects in next five years				$ 20.0						20.0
Period of investment in projects				5 years
Toquepala Concentrator Expansion | Peru
Other commitments:
Amount committed to funding for social and infrastructure improvement projects										116.2	S/ 445.0
Commitment liability recorded in the balance sheet										32.9
Development Fund Moquegua Region | Peru
Other commitments:
Amount committed to funding for social and infrastructure improvement projects										$ 261.1	S/ 1,000.0
Number of schools agreed for construction. | item										3	3
Amount committed to funding for school projects										$ 4.2	S/ 15.9
Copper | Michiquillay | Peru
Other commitments:
Annual production ( in tons) | T						225,000
Contingent contractual obligation						$ 400.0
Estimated mineralized material (in tons) | T						2,288,000,000
Copper grade percentage						0.43%
Initial mine life						25 years
Contractual obligation paid on project					12.5	$ 12.5
Remaining amount to pay if project is developed					$ 375.0
Educational Project | Tia Maria | Peru
Other commitments:
Number of jobs expected to be generated | person										9,000	9,000
Educational Project | Toquepala Concentrator Expansion | Peru
Other commitments:
Amount committed to funding for social and infrastructure improvement projects										$ 4.9	S/ 18.8
Educational Project | Development Fund Moquegua Region | Peru
Other commitments:
Amount committed to funding for social and infrastructure improvement projects										28.3	108.4
Construction of Cularjahuira Dam | Toquepala Concentrator Expansion | Peru
Other commitments:
Amount committed to funding for social and infrastructure improvement projects										4.1	15.6
Study Of Engineering For Collazas Dam | Toquepala Concentrator Expansion | Peru
Other commitments:
Amount committed to funding for social and infrastructure improvement projects										0.7	2.6
Water Treatment | Development Fund Moquegua Region | Peru
Other commitments:
Amount committed to funding for social and infrastructure improvement projects										20.9	79.9
Amount committed for funding social and infrastructure improvement projects, build tracks and sidewalks										1.7	6.4
Social Investment For Taxes | Toquepala Concentrator Expansion | Peru
Other commitments:
Amount committed to funding for social and infrastructure improvement projects										24.6	94.1
Social Investment For Taxes | Development Fund Moquegua Region | Peru
Other commitments:
Amount committed to funding for social and infrastructure improvement projects										$ 34.7	S/ 132.8
Number of Infrastructure Projects Agreed for Construction | item										2	2
Electroperu S.A | Power purchase agreements | Peru
Other commitments:
Purchase agreement, contracted power capacity (in megawatts) | MW									120
Term of power purchase agreement related to sale of power plant									20 years
Parque Eolico de Fenicias, S. de R.L. de C.V | Power purchase agreements | Mexico
Other commitments:
Purchase agreement, contracted power capacity (in megawatts per year) | MWh	611,400
Term of power purchase agreement related to sale of power plant	20 years
Kallpa | Power purchase agreements | Peru
Other commitments:
Purchase agreement, contracted power capacity (in megawatts) | MW								120
Term of power purchase agreement related to sale of power plant								10 years
Kallpa | Power purchase agreements | Peru | Maximum
Other commitments:
Purchase agreement, contracted power capacity (in megawatts) | MW							80