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COMMITMENTS AND CONTINGENCIES: - Other (Details)
S/ in Millions, $ in Millions
 1 Months Ended 12 Months Ended
Jul. 15, 2019
complaint
Jun. 30, 2018
USD ($)
T
May 31, 2016
MW
Jul. 31, 2014
MW
Jun. 30, 2014
MW
Dec. 31, 2019
PEN (S/)
person
item
km
T
Dec. 31, 2019
USD ($)
person
item
km
T
Other commitments              
Commitment for capital projects             $ 198.2
Tia Maria | Peru              
Other commitments              
Project budget             1,400.0
Amount spend as of the current date             $ 338.7
Annual production ( in tons) | T           120,000 120,000
Number Of Complaints | complaint 3            
Number of kilometer industrial railway built | km           32 32
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             $ 1,300.0
Amount spend as of the current date             1,280.1
Amount committed to funding for social and infrastructure improvement projects           S/ 445.0 134.2
Commitment liability recorded in the balance sheet             59.1
Development Fund Moquegua Region | Peru              
Other commitments              
Amount committed to funding for social and infrastructure improvement projects           S/ 700.0 $ 211.0
Copper | Michiquillay | Peru              
Other commitments              
Annual production ( in tons) | T   225,000          
Contingent contractual obligation   $ 400.0          
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   $ 12.5          
Remaining amount to pay if project is developed   $ 387.5          
Copper | Toquepala Concentrator Expansion | Peru              
Other commitments              
Estimated increase in annual production (in tons) | T           258,000 258,000
Estimated increase in annual production (in percent)           51.50% 51.50%
Power purchase agreements | Electroperu S.A | 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    
Power purchase agreements | Kallpa | 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      
Power purchase agreements | Kallpa | Peru | Maximum              
Other commitments              
Purchase agreement, contracted power capacity (in megawatts) | MW     80        
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 $ 32.7
Water Treatment | Development Fund Moquegua Region | Peru              
Other commitments              
Amount committed to funding for social and infrastructure improvement projects           48.4 14.6
Social Investment For Taxes | Development Fund Moquegua Region | Peru              
Other commitments              
Amount committed to funding for social and infrastructure improvement projects           S/ 59.5 $ 17.9
Number of infrastructure projects agreed for construction | item           2 2
Social Investment For Taxes | Tacna region [Member] | Peru              
Other commitments              
Amount committed to funding for social and infrastructure improvement projects           S/ 0.7 $ 0.2
Number of infrastructure projects agreed for construction | item           3 3