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COMMITMENTS AND CONTINGENCIES: (Details 3)
PEN in Millions, $ in Millions
 1 Months Ended 3 Months Ended 12 Months Ended
Jul. 31, 2014
MW
Jun. 30, 2014
MW
Mar. 31, 2016
PEN
item
m
km
T
Mar. 31, 2016
USD ($)
item
m
km
T
Dec. 31, 2014
PEN
Dec. 31, 2014
USD ($)
Dec. 31, 1997
Other commitments:              
Commitment for capital projects       $ 2,113.0      
Tia Maria | Peru              
Other commitments:              
Project budget       1,400.0      
Amount Spend In the Current Year       $ 361.9      
Annual production ( in tons) | T     120,000 120,000      
Distance of sea water transportation | km     25 25      
Additional investment in desalinization plant       $ 95.0      
Height above sea level of the desalinization plant | m     1,000 1,000      
Term life of environmental project (in years)     20 years 20 years      
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      
Toquepala Concentrator Expansion | Peru              
Other commitments:              
Project budget       $ 1,200.0      
Amount Spend In the Current Year       405.7      
Amount committed to funding for social and infrastructure improvement projects         PEN 100.0 $ 30.0  
Amount paid-out for development projects in the Candarave province     PEN 445.0 $ 134.0      
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      
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            
Purchase agreement, contracted power capacity (in megawatts) | MW 120