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COMMITMENTS AND CONTINGENCIES: - Others (Details)
S/ in Millions, $ in Millions
 1 Months Ended 3 Months Ended
May 31, 2016
MW
Jul. 31, 2014
MW
Jun. 30, 2014
MW
Mar. 31, 2018
PEN (S/)
item
m
km
T
Mar. 31, 2018
USD ($)
item
m
km
T
Other commitments:          
Commitment for capital projects         $ 1,401.9
Tia Maria | Peru          
Other commitments:          
Project budget         1,400.0
Amount spend as of the current date         $ 355.2
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       3,600 3,600
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         $ 1,300.0
Amount spend as of the current date         $ 968.1
Percentage of Work Completed (in percentage)       90.00% 90.00%
Amount committed to funding for social and infrastructure improvement projects       S/ 445.0 $ 132.0
Development Fund Moquegua Region | Peru          
Other commitments:          
Amount committed to funding for social and infrastructure improvement projects       S/ 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       S/ 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       S/ 143.0 $ 43.0
Electroperu S.A | Power purchase agreements | Peru          
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 | 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      
Kallpa | Power purchase agreements | Peru | Maximum          
Other commitments:          
Purchase agreement, contracted power capacity (in megawatts) | MW 80