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COMMITMENTS AND CONTINGENCIES: - Others (Details)
PEN in Millions, $ in Millions
 1 Months Ended 3 Months Ended 12 Months Ended
May 31, 2016
MW
Jul. 31, 2014
MW
Jun. 30, 2014
MW
Mar. 31, 2017
PEN
item
m
km
T
Mar. 31, 2017
USD ($)
item
m
km
T
Dec. 31, 1997
Other commitments:            
Commitment for capital projects         $ 1,433.5  
Tia Maria | Peru            
Other commitments:            
Project budget         1,400.0  
Amount spend as of the current date         $ 363.9  
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         623.4  
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  
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  
Enersur | Power purchase agreements            
Other commitments:            
Term of power purchase agreement related to sale of power plant           20 years
Electroperu S.A | Power purchase agreements            
Other commitments:            
Term of power purchase agreement related to sale of power plant     20 years      
Purchase agreement, contracted power capacity (in megawatts) | MW     120      
Kallpa | Power purchase agreements            
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        
Kallpa | Power purchase agreements | Maximum            
Other commitments:            
Purchase agreement, contracted power capacity (in megawatts) | MW 80