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COMMITMENTS AND CONTINGENCIES: - Others (Details)
S/ in Millions
 1 Months Ended 9 Months Ended
Jul. 15, 2019
complaint
Jun. 30, 2018
USD ($)
T
May 31, 2016
MW
Jul. 31, 2014
MW
Jun. 30, 2014
MW
Sep. 30, 2019
PEN (S/)
person
item
km
T
Sep. 30, 2019
USD ($)
person
item
km
T
Other commitments:              
Commitment for capital projects             $ 125,900,000
Tia Maria | Peru              
Other commitments:              
Number of kilometer industrial railway built | km           32 32
Project budget             $ 1,400,000,000
Number Of Complaints | complaint 3            
Amount spend as of the current date             $ 336,500,000
Annual production ( in tons) | T           120,000 120,000
Number of workers expected to be directly employed | item           600 600
Number of workers expected to be indirectly employed | item           4,200 4,200
Toquepala Concentrator Expansion | Peru              
Other commitments:              
Project budget             $ 1,320,000,000
Amount spend as of the current date             1,296,800,000
Amount committed to funding for social and infrastructure improvement projects           S/ 445.0 131,700,000
Commitment liability recorded in the balance sheet             62,100,000
Development Fund Moquegua Region | Peru              
Other commitments:              
Amount committed to funding for social and infrastructure improvement projects           S/ 700.0 $ 207,200,000
Copper | Michiquillay | Peru              
Other commitments:              
Annual production ( in tons) | T   225,000          
Contingent contractual obligation   $ 400,000,000          
Estimated mineralized material (in tons) | T   1,150,000,000          
Copper grade percentage   0.63%          
Initial mine life   25 years          
Contractual obligation paid on project   $ 12,500,000          
Remaining amount to pay if project is developed   $ 387,500,000          
Copper | Toquepala Concentrator Expansion | Peru              
Other commitments:              
Estimated increase in annual production (in tons) | T           257,000 257,000
Estimated increase in annual production (in percent)           51.00% 51.00%
Educational Project | Tia Maria | Peru              
Other commitments:              
Number of persons got benefits from the programs | person           700 700
Number of jobs expected to be generated | person           9,000 9,000
Number of Direct Jobs Expected to be Generated | person           3,600 3,600
Number of Indirect Jobs Expected to be Generated | person           5,400 5,400
Educational Project | Development Fund Moquegua Region | Peru              
Other commitments:              
Amount committed to funding for social and infrastructure improvement projects           S/ 108.5 $ 32,100,000
Water Treatment | Development Fund Moquegua Region | Peru              
Other commitments:              
Amount committed to funding for social and infrastructure improvement projects           48.4 14,300,000
Social Investment For Taxes | Development Fund Moquegua Region | Peru              
Other commitments:              
Amount committed to funding for social and infrastructure improvement projects           S/ 202.0 $ 59,800,000
Number of Infrastructure Projects Agreed for Construction             6
Electroperu S.A | Power purchase agreements | Peru              
Other commitments:              
Purchase agreement, contracted power capacity (in megawatts) | MW         120    
Term of power purchase agreement related to sale of power plant         20 years    
Kallpa | Power purchase agreements | Peru              
Other commitments:              
Purchase agreement, contracted power capacity (in megawatts) | MW       120      
Term of power purchase agreement related to sale of power plant     10 years 10 years      
Kallpa | Power purchase agreements | Peru | Maximum              
Other commitments:              
Purchase agreement, contracted power capacity (in megawatts) | MW     80