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COMMITMENTS AND CONTINGENCIES: - Others (Details)
S/ in Millions, $ in Millions
 1 Months Ended 3 Months Ended
Feb. 20, 2020
MW
Jul. 15, 2019
complaint
Jul. 08, 2019
USD ($)
T
Jun. 30, 2021
USD ($)
Jun. 30, 2018
USD ($)
T
May 31, 2016
MW
Jul. 31, 2014
MW
Jun. 30, 2014
MW
Mar. 31, 2022
USD ($)
person
item
Mar. 31, 2022
PEN (S/)
person
item
Dec. 31, 2021
USD ($)
Mar. 31, 2021
USD ($)
Other commitments:                        
Property net book value                 $ 9,492.9   $ 9,464.4 $ 9,454.4
Commitment for capital projects                 369.2      
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                 $ 332.3      
Annual production ( in tons) | T     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                 $ 120.2 S/ 445.0    
Commitment liability recorded in the balance sheet                 34.6      
Development Fund Moquegua Region | Peru                        
Other commitments:                        
Amount committed to funding for social and infrastructure improvement projects                 $ 270.2 S/ 1,000.0    
Number of schools agreed for construction. | item                 3 3    
Amount committed to funding for school projects                 $ 4.3 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    
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                 $ 5.1 S/ 18.8    
Educational Project | Development Fund Moquegua Region | Peru                        
Other commitments:                        
Amount committed to funding for social and infrastructure improvement projects                 29.3 108.4    
Construction of Cularjahuira Dam | Toquepala Concentrator Expansion | Peru                        
Other commitments:                        
Amount committed to funding for social and infrastructure improvement projects                 4.2 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                 21.6 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                 19.0 70.3    
Social Investment For Taxes | Development Fund Moquegua Region | Peru                        
Other commitments:                        
Amount committed to funding for social and infrastructure improvement projects                 $ 27.1 S/ 100.4    
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