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COMMITMENTS AND CONTINGENCIES: - Other (Details)
PEN in Millions, $ in Millions
 1 Months Ended 12 Months Ended
May 31, 2016
Jul. 31, 2014
MW
Jun. 30, 2014
MW
May 31, 2012
MW
Dec. 31, 2016
PEN
item
m
km
T
Dec. 31, 2016
USD ($)
item
m
km
T
Dec. 31, 1997
Other commitments:              
Commitment for capital projects           $ 1,447.2  
Tia Maria | Peru              
Other commitments:              
Project budget           1,400.0  
Amount spend as of the current date           $ 363.5  
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           $ 95.0  
Number of jobs expected to be generated | item         3,500 3,500  
Number of workers expected to be directly employed | item         600 600  
Number of workers expected to be indirectly employed | item         2,000 2,000  
Term life of environmental project (in years)         20 years 20 years  
Amount committed to funding for social and infrastructure improvement projects         PEN 100.0 $ 29.0  
Toquepala Concentrator Expansion | Peru              
Other commitments:              
Project budget           1,200.0  
Amount spend as of the current date           550.4  
Amount committed to funding for social and infrastructure improvement projects         445.0 132.0  
Development Fund Moquegua Region | Peru              
Other commitments:              
Amount committed to funding for social and infrastructure improvement projects         PEN 700.0 $ 209.0  
Copper | Toquepala Concentrator Expansion | Peru              
Other commitments:              
Estimated increase in annual production (in tons) | T         100,000 100,000  
Molybdenum | Toquepala Concentrator Expansion | Peru              
Other commitments:              
Estimated increase in annual production (in tons) | T         3,100 3,100  
Power purchase agreements | Enersur              
Other commitments:              
Term of power purchase agreement related to sale of power plant             20 years
Power purchase agreements | Electroperu S.A              
Other commitments:              
Term of power purchase agreement related to sale of power plant     20 years        
Purchase agreement, contracted power capacity (in megawatts) | MW     120        
Power purchase agreements | Kallpa              
Other commitments:              
Term of power purchase agreement related to sale of power plant 10 years 10 years          
Purchase agreement, contracted power capacity (in megawatts) | MW   120          
Power purchase agreements | Kallpa | Maximum              
Other commitments:              
Purchase agreement, contracted power capacity (in megawatts) | MW       80      
Educational Project | Development Fund Moquegua Region | Peru              
Other commitments:              
Amount committed to funding for social and infrastructure improvement projects         PEN 108.5 $ 32.0  
Water Treatment | Development Fund Moquegua Region | Peru              
Other commitments:              
Amount committed to funding for social and infrastructure improvement projects         48.4 14.0  
Social Investment For Taxes | Development Fund Moquegua Region | Peru              
Other commitments:              
Amount committed to funding for social and infrastructure improvement projects         PEN 143.0 $ 43.0