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COMMITMENTS AND CONTINGENCIES: - Others (Details)
$ in Thousands, S/ in Millions
 1 Months Ended 3 Months Ended
Jun. 30, 2018
USD ($)
T
May 31, 2016
MW
Jul. 31, 2014
MW
Jun. 30, 2014
MW
Mar. 31, 2019
PEN (S/)
item
m
km
T
Mar. 31, 2019
USD ($)
item
m
km
T
Other commitments:            
Commitment for capital projects           $ 177,700
Tia Maria | Peru            
Other commitments:            
Project budget           1,400,000
Amount spend as of the current date           $ 333,300
Annual production ( in tons) | T         120,000 120,000
Distance of sea water transportation | km         25 25
Height above sea level of the desalinization plant | m         1,000 1,000
Additional investment in desalinization plant           $ 95,000
Number of jobs expected to be generated | item         9,000 9,000
Number of Direct Jobs Expected to be Generated         3,600 3,600
Number of Indirect Jobs Expected to be Generated         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
Term life of environmental project (in years)         20 years 20 years
Toquepala Concentrator Expansion | Peru            
Other commitments:            
Project budget           $ 1,320,000
Amount spend as of the current date           1,240,900
Amount committed to funding for social and infrastructure improvement projects         S/ 445.0 131,700
Development Fund Moquegua Region | Peru            
Other commitments:            
Amount committed to funding for social and infrastructure improvement projects         S/ 700.0 $ 207,200
Copper | Michiquillay | Peru            
Other commitments:            
Annual production ( in tons) | T 225,000          
Contingent contractual obligation $ 400,000          
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          
Remaining amount to pay if project is developed $ 387,500          
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 | Development Fund Moquegua Region | Peru            
Other commitments:            
Amount committed to funding for social and infrastructure improvement projects         S/ 108.5 $ 32,100
Water Treatment | Development Fund Moquegua Region | Peru            
Other commitments:            
Amount committed to funding for social and infrastructure improvement projects         48.4 14,300
Social Investment For Taxes | Development Fund Moquegua Region | Peru            
Other commitments:            
Amount committed to funding for social and infrastructure improvement projects         S/ 202.0 $ 59,800
Number of Infrastructure Projects Agreed for Construction         6 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