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COMMITMENTS AND CONTINGENCIES: - Others (Details) S/ in Millions, $ in Millions | 1 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 USD ($) T | May 31, 2016 MW | Jul. 31, 2014 MW | Jun. 30, 2014 MW | Sep. 30, 2018 PEN (S/) item m km T | Sep. 30, 2018 USD ($) item m km T | Dec. 31, 2017 USD ($)
Other commitments: |  |  |  |  |  |  |
Commitment for capital projects |  |  |  |  |  | $ 1,382.7 |
Amount accrued for project to evaluate the next 3 to 5 years |  |  |  |  |  | 58.4 | $ 37.2
Tia Maria | Peru |  |  |  |  |  |  |
Other commitments: |  |  |  |  |  |  |
Project budget |  |  |  |  |  | 1,400.0 |
Amount spend as of the current date |  |  |  |  |  | $ 355.0 |
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 |  |  |  |  |  | $ 1,192.4 |
Percentage of Work Completed (in percentage) |  |  |  |  | 98.00% | 98.00% |
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 | 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 |  |  |  |  |  |
Amount accrued for project to evaluate the next 3 to 5 years | 12.5 |  |  |  |  |  |
Remaining amount to pay if project is developed | $ 375.0 |  |  |  |  |  |
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 |  |  |  |  |

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