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COMMITMENTS AND CONTINGENCIES: - Others (Details) PEN in Millions, $ in Millions | 1 Months Ended | 9 Months Ended
--- | --- | ---
May 31, 2016 MW | Jul. 31, 2014 MW | Jun. 30, 2014 MW | Sep. 30, 2017 PEN item m km T | Sep. 30, 2017 USD ($) item m km T
Other commitments: |  |  |  |  |
Commitment for capital projects |  |  |  |  | $ 775.8
Tia Maria | Peru |  |  |  |  |
Other commitments: |  |  |  |  |
Project budget |  |  |  |  | 1,400.0
Amount spend as of the current date |  |  |  |  | $ 350.3
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 |  |  |  | 3,500 | 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
Term life of environmental project (in years) |  |  |  | 20 years | 20 years
Toquepala Concentrator Expansion | Peru |  |  |  |  |
Other commitments: |  |  |  |  |
Project budget |  |  |  |  | $ 1,200.0
Amount spend as of the current date |  |  |  |  | $ 743.5
Percentage of Work Completed (in percentage) |  |  |  | 80.00% | 80.00%
Amount committed to funding for social and infrastructure improvement projects |  |  |  | PEN 445.0 | $ 132.0
Development Fund Moquegua Region | Peru |  |  |  |  |
Other commitments: |  |  |  |  |
Amount committed to funding for social and infrastructure improvement projects |  |  |  | PEN 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 |  |  |  | PEN 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 |  |  |  | PEN 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 |  |  |  |

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