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COMMITMENTS AND CONTINGENCIES: - Others (Details)
S/ in Millions
 1 Months Ended 6 Months Ended
Jun. 30, 2018
USD ($)
T
May 31, 2016
MW
Jul. 31, 2014
MW
Jun. 30, 2014
MW
Jun. 30, 2019
USD ($)
item
person
km
T
Jun. 30, 2019
PEN (S/)
item
person
km
T
Other commitments:            
Commitment for capital projects         $ 118,000,000.0  
Tia Maria | Peru            
Other commitments:            
Number of kilometer industrial railway built | km         32 32
Project budget         $ 1,400,000,000  
Amount spend as of the current date         $ 335,700,000  
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:            
Project budget         $ 1,320,000,000  
Amount spend as of the current date         1,291,600,000  
Amount committed to funding for social and infrastructure improvement projects         131,700,000 S/ 445.0
Commitment liability recorded in the balance sheet         62,400,000  
Development Fund Moquegua Region | Peru            
Other commitments:            
Amount committed to funding for social and infrastructure improvement projects         $ 207,200,000 S/ 700.0
Copper | Michiquillay | Peru            
Other commitments:            
Annual production ( in tons) | T 225,000          
Contingent contractual obligation $ 400,000,000          
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 $ 12,500,000          
Remaining amount to pay if project is developed $ 387,500,000          
Copper | Toquepala Concentrator Expansion | Peru            
Other commitments:            
Estimated increase in annual production (in tons) | T         258,000 258,000
Estimated increase in annual production (in percent)         52.00% 52.00%
Educational Project | Tia Maria | Peru            
Other commitments:            
Number of persons got benefits from the programs | person         700 700
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         $ 32,100,000 S/ 108.5
Water Treatment | Development Fund Moquegua Region | Peru            
Other commitments:            
Amount committed to funding for social and infrastructure improvement projects         14,300,000 48.4
Social Investment For Taxes | Development Fund Moquegua Region | Peru            
Other commitments:            
Amount committed to funding for social and infrastructure improvement projects         $ 59,800,000 S/ 202.0
Number of Infrastructure Projects Agreed for Construction         6  
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    
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 10 years      
Kallpa | Power purchase agreements | Peru | Maximum            
Other commitments:            
Purchase agreement, contracted power capacity (in megawatts) | MW   80