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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, 2017
PEN
item
m
km
T
Dec. 31, 2017
USD ($)
item
m
km
T
Other commitments:            
Commitment for capital projects           $ 1,409.3
Tia Maria | Peru            
Other commitments:            
Project budget           1,400.0
Amount spend as of the current date           $ 353.9
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
Toquepala Concentrator Expansion | Peru            
Other commitments:            
Project budget           $ 1,200.0
Amount spend as of the current date           $ 892.9
Percentage of Work Completed (in percentage)         87.00% 87.00%
Amount committed to funding for social and infrastructure improvement projects         PEN 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 | 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 | Peru            
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 | Peru | 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