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COMMITMENTS AND CONTINGENCIES: - Others (Details)
S/ in Millions, $ in Millions
 1 Months Ended 6 Months Ended
Feb. 20, 2020
MWh
Apr. 30, 2025
USD ($)
Jun. 30, 2022
Jun. 30, 2021
USD ($)
Jun. 30, 2018
USD ($)
T
May 31, 2016
MW
Jul. 31, 2014
MW
Jun. 30, 2014
MW
Jun. 30, 2025
USD ($)
item
Jun. 30, 2025
PEN (S/)
item
Jun. 30, 2025
PEN (S/)
Other commitments:                      
Commitment for capital projects | $                 $ 609.5    
Peru | Power purchase agreements | Electroperu S.A                      
Other commitments:                      
Purchase agreement, contracted power capacity (in megawatts) | MW               120      
Term of power purchase agreement related to sale of power plant               20 years      
Peru | Power purchase agreements | Kallpa                      
Other commitments:                      
Purchase agreement, contracted power capacity (in megawatts) | MW             120        
Term of power purchase agreement related to sale of power plant             10 years        
Peru | Power purchase agreements | Kallpa | Maximum                      
Other commitments:                      
Purchase agreement, contracted power capacity (in megawatts) | MW           80          
Mexico | Power purchase agreements | Parque Eolico de Fenicias, S. de R.L. de C.V                      
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                    
Michiquillay                      
Other commitments:                      
Pre-operational period     12 years                
Extended pre-operational period     3 years                
Number of meters drilled                 145,928 145,928  
Number of drill core samples obtained                 59,098 59,098  
Michiquillay | Peru | Copper                      
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   $ 375.0              
Extended pre-operational period   3 years                  
Investment in projects in next five years | $                 $ 20.0    
Period of investment in projects                 5 years 5 years  
Additional extended preoperational period   3 years                  
Amount of cash consideration required to pay | $                 $ 21.0    
Additional amount committed for social investments and exploration programs between 4th and 6th years of preoperational period | $                 15.0    
Toquepala Concentrator Expansion | Peru                      
Other commitments:                      
Amount committed to funding for social and infrastructure improvement projects                 125.4 S/ 445.0  
Commitment liability recorded in the balance sheet | $                 28.8    
Toquepala Concentrator Expansion | Peru | Educational Project                      
Other commitments:                      
Amount committed to funding for social and infrastructure improvement projects                 5.3 18.8  
Toquepala Concentrator Expansion | Peru | Agricultural Projects                      
Other commitments:                      
Amount committed to funding for social and infrastructure improvement projects                 31.7 112.4  
Toquepala Concentrator Expansion | Peru | Construction of Cularjahuira Dam                      
Other commitments:                      
Amount committed to funding for social and infrastructure improvement projects                 4.4 15.6  
Toquepala Concentrator Expansion | Peru | Study of Engineering for Collazas Dam                      
Other commitments:                      
Amount committed to funding for social and infrastructure improvement projects                 0.7 2.6  
Toquepala Concentrator Expansion | Peru | Infrastructure Projects                      
Other commitments:                      
Amount committed to funding for social and infrastructure improvement projects                 17.1 60.6  
Toquepala Concentrator Expansion | Peru | Drinking Water Project                      
Other commitments:                      
Amount committed to funding for social and infrastructure improvement projects                 2.7 9.6  
Toquepala Concentrator Expansion | Peru | Construction of a high-achievement school                      
Other commitments:                      
Amount committed to funding for social and infrastructure improvement projects                 28.8 102.1  
Toquepala Concentrator Expansion | Peru | Works for Taxes                      
Other commitments:                      
Amount committed to funding for social and infrastructure improvement projects                 $ 19.1 S/ 67.8  
Number of infrastructure projects agreed for construction                 4 4  
Development Fund Moquegua Region | Peru                      
Other commitments:                      
Amount committed to funding for social and infrastructure improvement projects                 $ 281.8 S/ 1,000.0  
Amount committed to funding for school projects                 $ 5.1 S/ 18.2  
Number of schools agreed for construction                 3 3  
Development Fund Moquegua Region | Peru | Educational Project                      
Other commitments:                      
Amount committed to funding for social and infrastructure improvement projects                 $ 30.5 S/ 108.4  
Amount of investment in project                 $ 30.4   S/ 107.9
Development Fund Moquegua Region | Peru | Agricultural Projects                      
Other commitments:                      
Number of infrastructure projects agreed for construction                 2 2  
Amount of investment in project                 $ 1.9   S/ 6.9
Development Fund Moquegua Region | Peru | Works for Taxes                      
Other commitments:                      
Amount committed to funding for social and infrastructure improvement projects                 $ 64.2 S/ 228.0  
Number of infrastructure projects agreed for construction                 3 3  
Number of basic sanitation project committed.                 1 1  
Pre investment studies for road infrastructure                 $ 1.1 S/ 3.9  
Development Fund Moquegua Region | Peru | Funding for Different Projects                      
Other commitments:                      
Amount committed to funding for social and infrastructure improvement projects                 70.8 251.3  
Development Fund Moquegua Region | Peru | Water Treatment                      
Other commitments:                      
Amount committed to funding for social and infrastructure improvement projects                 $ 29.7 S/ 105.5  
Percentage of progress on construction                 58.00% 58.00%  
Apurimac Region | Works for Taxes                      
Other commitments:                      
Amount committed to funding for school projects                 $ 23.7 S/ 84.0  
Number of schools agreed for construction                 2 2  
Arequipa Region | Works for Taxes                      
Other commitments:                      
Amount committed to funding for school projects                 $ 31.1 S/ 110.2  
Number of schools agreed for construction                 2 2  
Amount committed to Finance for past infrastructure project                 $ 1.8 S/ 6.3  
Cajamarca Region | Works for Taxes                      
Other commitments:                      
Amount committed for funding health projects                 $ 0.2 S/ 0.7