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COMMITMENTS AND CONTINGENCIES: - Others (Details)
S/ in Millions, $ in Millions
 1 Months Ended 3 Months Ended
Feb. 20, 2020
MWh
Jun. 30, 2022
USD ($)
Jun. 30, 2021
USD ($)
Jun. 30, 2018
USD ($)
T
May 31, 2016
MW
Jul. 31, 2014
MW
Jun. 30, 2014
MW
Mar. 31, 2023
USD ($)
item
Mar. 31, 2023
PEN (S/)
item
Dec. 31, 2022
USD ($)
Mar. 31, 2022
USD ($)
Other commitments:                      
Property net book value               $ 9,613.9   $ 9,596.6 $ 9,492.9
Commitment for capital projects               439.5      
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               $ 118.2 S/ 445.0    
Number Of Terrace Fields Projects | item               6 6    
Commitment liability recorded in the balance sheet               $ 31.3      
Development Fund Moquegua Region | Peru                      
Other commitments:                      
Amount committed to funding for social and infrastructure improvement projects               $ 265.6 S/ 1,000.0    
Number of schools agreed for construction. | item               3 3    
Amount committed to funding for school projects               $ 4.8 S/ 18.2    
Copper | Michiquillay | Peru                      
Other commitments:                      
Contingent contractual obligation       $ 400.0              
Estimated mineralized material (in tons) | T       2,288,000,000              
Copper grade percentage       0.43%              
Annual production ( in tons) | T       225,000              
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 | Toquepala Concentrator Expansion | Peru                      
Other commitments:                      
Amount committed to funding for social and infrastructure improvement projects               5.0 18.8    
Educational Project | Development Fund Moquegua Region | Peru                      
Other commitments:                      
Amount committed to funding for social and infrastructure improvement projects               28.8 108.4    
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    
Terrace Fields Projects | Toquepala Concentrator Expansion | Peru                      
Other commitments:                      
Amount committed to funding for social and infrastructure improvement projects               2.8 10.7    
Irrigation Systems Projects | Toquepala Concentrator Expansion | Peru                      
Other commitments:                      
Amount committed to funding for social and infrastructure improvement projects               1.1 4.2    
Water Treatment | Development Fund Moquegua Region | Peru                      
Other commitments:                      
Amount committed to funding for social and infrastructure improvement projects               28.0 105.5    
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               26.0 97.7    
Social Investment For Taxes | Development Fund Moquegua Region | Peru                      
Other commitments:                      
Amount committed to funding for social and infrastructure improvement projects               $ 40.5 S/ 152.3    
Number of Infrastructure Projects Agreed for Construction | item               4 4    
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:                      
Term of power purchase agreement related to sale of power plant 20 years                    
Purchase agreement, contracted power capacity (in megawatts per year) | MWh 611,400                    
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