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COMMITMENTS AND CONTINGENCIES: - Others (Details)
S/ in Millions, $ in Millions
 1 Months Ended 9 Months Ended
Feb. 20, 2020
MW
Jul. 15, 2019
complaint
Jun. 30, 2021
USD ($)
Jun. 30, 2018
USD ($)
T
May 31, 2016
MW
Jul. 31, 2014
MW
Jun. 30, 2014
MW
Sep. 30, 2021
USD ($)
item
person
T
Sep. 30, 2021
PEN (S/)
item
person
T
Other commitments:                  
Commitment for capital projects               $ 369.4  
Tia Maria | Peru                  
Other commitments:                  
Project budget               1,400.0  
Number Of Complaints | complaint   3              
Amount spend as of the current date               $ 340.7  
Annual production ( in tons) | T               120,000 120,000
Number of workers expected to be directly employed | item               600 600
Number of workers expected to be indirectly employed | item               4,200 4,200
Toquepala Concentrator Expansion | Peru                  
Other commitments:                  
Amount committed to funding for social and infrastructure improvement projects               $ 107.6 S/ 445.0
Commitment liability recorded in the balance sheet               32.5  
Development Fund Moquegua Region | Peru                  
Other commitments:                  
Amount committed to funding for social and infrastructure improvement projects               $ 241.8 S/ 1,000.0
Number of schools agreed for construction. | item               3 3
Amount committed to funding for school projects               $ 3.8 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       1,150,000,000          
Copper grade percentage       0.63%          
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
Number of Direct Jobs Expected to be Generated | person               3,600 3,600
Number of Indirect Jobs Expected to be Generated | person               5,400 5,400
Educational Project | Toquepala Concentrator Expansion | Peru                  
Other commitments:                  
Amount committed to funding for social and infrastructure improvement projects               $ 4.2 S/ 17.2
Educational Project | Development Fund Moquegua Region | Peru                  
Other commitments:                  
Amount committed to funding for social and infrastructure improvement projects               26.2 108.4
Water Treatment | Development Fund Moquegua Region | Peru                  
Other commitments:                  
Amount committed to funding for social and infrastructure improvement projects               19.3 79.9
Amount committed for funding social and infrastructure improvement projects, build tracks and sidewalks               1.5 6.4
Social Investment For Taxes | Toquepala Concentrator Expansion | Peru                  
Other commitments:                  
Amount committed to funding for social and infrastructure improvement projects               16.7 69.0
Social Investment For Taxes | Development Fund Moquegua Region | Peru                  
Other commitments:                  
Amount committed to funding for social and infrastructure improvement projects               $ 21.0 S/ 86.7
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) | MW 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