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COMMITMENTS AND CONTINGENCIES: - Others (Details)
S/ in Millions, $ in Millions
 1 Months Ended 6 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
Jun. 30, 2021
USD ($)
person
item
T
Jun. 30, 2021
PEN (S/)
person
item
T
Other commitments:                  
Commitment for capital projects               $ 253.4  
Tia Maria | Peru                  
Other commitments:                  
Project budget               1,400.0  
Number Of Complaints | complaint   3              
Amount spend as of the current date     $ 340.4         $ 340.4  
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               $ 115.1 S/ 445.0
Commitment liability recorded in the balance sheet               35.9  
Development Fund Moquegua Region | Peru                  
Other commitments:                  
Amount committed to funding for social and infrastructure improvement projects               258.7 1,000.0
Amount committed to funding for school projects               4.0 S/ 15.3
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         $ 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 | Development Fund Moquegua Region | Peru                  
Other commitments:                  
Amount committed to funding for social and infrastructure improvement projects               $ 28.0 S/ 108.4
Water Treatment | Development Fund Moquegua Region | Peru                  
Other commitments:                  
Amount committed to funding for social and infrastructure improvement projects               20.4 78.7
Social Investment For Taxes | Toquepala Concentrator Expansion | Peru                  
Other commitments:                  
Amount committed to funding for social and infrastructure improvement projects               18.2 70.2
Social Investment For Taxes | Development Fund Moquegua Region | Peru                  
Other commitments:                  
Amount committed to funding for social and infrastructure improvement projects               $ 23.0 S/ 88.8
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