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COMMITMENTS AND CONTINGENCIES: (Details 3) PEN in Millions, $ in Millions | 1 Months Ended | 12 Months Ended
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Jul. 31, 2014 MW | Jun. 30, 2014 MW | Dec. 31, 2015 USD ($) | Dec. 31, 2015 USD ($) MW | Dec. 31, 2015 USD ($) m | Dec. 31, 2015 USD ($) ft | Dec. 31, 2015 USD ($) mi | Dec. 31, 2015 USD ($) km | Dec. 31, 2015 USD ($) | Dec. 31, 2015 USD ($) item | Dec. 31, 2015 USD ($) T | Dec. 31, 2015 PEN | Dec. 31, 2015 USD ($) | Dec. 31, 2014 PEN | Dec. 31, 2014 USD ($) | Dec. 31, 2005 item | Dec. 31, 1997
Other commitments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments for development of capital investment projects |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,225.7 |  |  |  |
Tia Maria | Peru |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other commitments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Project budget |  |  |  |  |  |  |  |  |  |  |  |  | 1,400.0 |  |  |  |
Carrying Amount invested in the project |  |  | $ 361.5 | $ 361.5 | $ 361.5 | $ 361.5 | $ 361.5 | $ 361.5 | $ 361.5 | $ 361.5 | $ 361.5 |  | 361.5 |  |  |  |
Annual production ( in tons) | T |  |  |  |  |  |  |  |  |  |  | 120,000 |  |  |  |  |  |
Distance of sea water transportation |  |  |  |  |  |  | 15.5 | 25 |  |  |  |  |  |  |  |  |
Height above sea level of the desalinization plant |  |  |  |  | 1,000 | 3,300 |  |  |  |  |  |  |  |  |  |  |
Additional investment in desalinization plant |  |  |  |  |  |  |  |  |  |  |  |  | 95.0 |  |  |  |
Number of jobs expected to be generated | item |  |  |  |  |  |  |  |  |  | 3,500 |  |  |  |  |  |  |
Number of workers expected to be directly employed | item |  |  |  |  |  |  |  |  |  | 600 |  |  |  |  |  |  |
Number of workers expected to be indirectly employed | item |  |  |  |  |  |  |  |  |  | 2,000 |  |  |  |  |  |  |
Expected life of project related service |  |  | 20 years |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount expended for funding social and infrastructure improvement projects |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 29.0 |  |
Amount committed to funding for social and infrastructure improvement projects | PEN |  |  |  |  |  |  |  |  |  |  |  |  |  | PEN 100.0 |  |  |
Toquepala Concentrator Expansion | Peru |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other commitments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Project budget |  |  |  |  |  |  |  |  |  |  |  |  | 1,200.0 |  |  |  |
Carrying Amount invested in the project |  |  | $ 392.0 | $ 392.0 | $ 392.0 | $ 392.0 | $ 392.0 | $ 392.0 | $ 392.0 | $ 392.0 | $ 392.0 |  | 392.0 |  |  |  |
Amount committed to funding for social and infrastructure improvement projects |  |  |  |  |  |  |  |  |  |  |  | PEN 445.0 | $ 130.0 |  |  |  |
MGE |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other commitments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related party transactions number of power plants to be contructed | item |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 |
Percentage of supply to third-party energy users |  |  |  |  |  |  |  |  | 12.00% |  |  |  |  |  |  |  |
MGE | Mexico |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other commitments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net total capacity (in megawatts) | MW |  |  |  | 516.2 |  |  |  |  |  |  |  |  |  |  |  |  |
Copper | Toquepala Concentrator Expansion | Peru |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other commitments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated increase in annual production (in tons) | T |  |  |  |  |  |  |  |  |  |  | 100,000 |  |  |  |  |  |
Molybdenum | Toquepala Concentrator Expansion | Peru |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other commitments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated increase in annual production (in tons) | T |  |  |  |  |  |  |  |  |  |  | 3,100 |  |  |  |  |  |
Power purchase agreements | Enersur |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other commitments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Term of power purchase agreement related to sale of power plant |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 20 years
Power purchase agreements | Electroperu S.A | Peru |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other commitments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Term of power purchase agreement related to sale of power plant |  | 20 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of megawatt supply energy for which the entity signed the agreement | MW |  | 120 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Power purchase agreements | Kallpa | Peru |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other commitments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Term of power purchase agreement related to sale of power plant | 10 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of megawatt supply energy for which the entity signed the agreement | MW | 120 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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