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COMMITMENTS AND CONTINGENCIES: - Other (Details)
S/ in Millions, $ in Millions
 1 Months Ended 12 Months Ended
Feb. 20, 2020
MW
Jul. 15, 2019
complaint
Jun. 30, 2018
USD ($)
T
May 31, 2016
MW
Jul. 31, 2014
MW
Jun. 30, 2014
MW
Dec. 31, 2020
USD ($)
item
T
Dec. 31, 2020
PEN (S/)
item
T
Other commitments                
Commitment for capital projects | $             $ 365.8  
Tia Maria | Peru                
Other commitments                
Project budget | $             1,400.0  
Amount spend as of the current date | $             $ 338.8  
Annual production ( in tons) | T             120,000 120,000
Number Of Complaints | complaint   3            
Number of jobs expected to be generated | item             9,000 9,000
Number of direct jobs expected to be generated | item             3,600 3,600
Number of indirect jobs expected to be generated | item             5,400 5,400
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             $ 122.8 S/ 445.0
Commitment liability recorded in the balance sheet | $             41.3  
Development Fund Moquegua Region | Peru                
Other commitments                
Amount committed to funding for social and infrastructure improvement projects             275.9 1,000.0
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          
Remaining amount to pay if project is developed | $     $ 387.5          
Power purchase agreements | Electroperu S.A | 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    
Power purchase agreements | Kallpa | 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 10 years      
Power purchase agreements | Kallpa | Peru | Maximum                
Other commitments                
Purchase agreement, contracted power capacity (in megawatts) | MW       80        
Power purchase agreements | Parque Eolico de Fenicias, S. de R.L. de C.V | 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              
Educational Project | Development Fund Moquegua Region | Peru                
Other commitments                
Amount committed to funding for social and infrastructure improvement projects             29.9 108.4
Water Treatment | Development Fund Moquegua Region | Peru                
Other commitments                
Amount committed to funding for social and infrastructure improvement projects             21.5 78.0
Social Investment For Taxes | Development Fund Moquegua Region | Peru                
Other commitments                
Amount committed to funding for social and infrastructure improvement projects             $ 24.0 S/ 86.9
Number of infrastructure projects agreed for construction | item             2 2
Social Investment For Taxes | Tacna region [Member] | Peru                
Other commitments                
Amount committed to funding for social and infrastructure improvement projects             $ 19.2 S/ 69.7
Number of infrastructure projects agreed for construction | item             1 1