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COMMITMENTS AND CONTINGENCIES: - Others (Details)
S/ in Millions, $ in Millions
 1 Months Ended 12 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
Dec. 31, 2021
USD ($)
person
item
T
Dec. 31, 2021
PEN (S/)
person
item
T
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Other commitments:                      
Property net book value               $ 9,464.4   $ 9,458.7 $ 9,371.0
Commitment for capital projects               355.1      
Tia Maria | Peru                      
Other commitments:                      
Project budget               1,400.0      
Number Of Complaints | complaint   3                  
Amount spend as of the current date               332.0      
Property net book value               $ 310.2      
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               $ 111.3 S/ 445.0    
Commitment liability recorded in the balance sheet               29.3      
Development Fund Moquegua Region | Peru                      
Other commitments:                      
Amount committed to funding for social and infrastructure improvement projects               $ 250.1 S/ 1,000.0    
Number of schools agreed for construction. | item               3 3    
Amount committed to funding for school projects               $ 4.0 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               $ 4.3 S/ 17.2    
Educational Project | Development Fund Moquegua Region | Peru                      
Other commitments:                      
Amount committed to funding for social and infrastructure improvement projects               27.1 108.4    
Water Treatment | Development Fund Moquegua Region | Peru                      
Other commitments:                      
Amount committed to funding for social and infrastructure improvement projects               20.0 79.9    
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               17.3 69.0    
Social Investment For Taxes | Development Fund Moquegua Region | Peru                      
Other commitments:                      
Amount committed to funding for social and infrastructure improvement projects               $ 21.7 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