COMMITMENTS AND CONTINGENCIES: - Others (Details) S/ in Millions, $ in Millions			1 Months Ended						9 Months Ended
	Feb. 20, 2020 MWh	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	Sep. 30, 2022 USD ($) person item	Sep. 30, 2022 PEN (S/) person item	Dec. 31, 2021 USD ($)	Sep. 30, 2021 USD ($)
Other commitments:
Property net book value									$ 9,554.5		$ 9,464.4	$ 9,476.1
Commitment for capital projects									434.8
Tia Maria | Peru
Other commitments:
Project budget		$ 1,400.0							1,400.0
Amount spend as of the current date									333.7
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
Period of investment in projects			5 years
Toquepala Concentrator Expansion | Peru
Other commitments:
Amount committed to funding for social and infrastructure improvement projects									111.7	S/ 445.0
Commitment liability recorded in the balance sheet									30.8
Development Fund Moquegua Region | Peru
Other commitments:
Amount committed to funding for social and infrastructure improvement projects									$ 251.0	S/ 1,000.0
Number of schools agreed for construction. | item									3	3
Amount committed to funding for school projects									$ 4.6	S/ 18.2
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									$ 4.7	S/ 18.8
Educational Project | Development Fund Moquegua Region | Peru
Other commitments:
Amount committed to funding for social and infrastructure improvement projects									27.2	108.4
Construction of Cularjahuira Dam | Toquepala Concentrator Expansion | Peru
Other commitments:
Amount committed to funding for social and infrastructure improvement projects									3.9	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									24.5	105.5
Amount committed for funding social and infrastructure improvement projects, build tracks and sidewalks									1.6	6.4
Social Investment For Taxes | Toquepala Concentrator Expansion | Peru
Other commitments:
Amount committed to funding for social and infrastructure improvement projects									24.5	97.7
Social Investment For Taxes | Development Fund Moquegua Region | Peru
Other commitments:
Amount committed to funding for social and infrastructure improvement projects									$ 35.5	S/ 141.4
Number of Infrastructure Projects Agreed for Construction | item									3	3
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