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COMMITMENTS AND CONTINGENCIES: (Details 3) PEN in Millions, $ in Millions | 1 Months Ended | 9 Months Ended | 12 Months Ended
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Jul. 31, 2014 MW | Jun. 30, 2014 MW | Sep. 30, 2015 | Sep. 30, 2015 MW | Sep. 30, 2015 m | Sep. 30, 2015 ft | Sep. 30, 2015 mi | Sep. 30, 2015 km | Sep. 30, 2015 | Sep. 30, 2015 item | Sep. 30, 2015 T | Sep. 30, 2015 PEN | Sep. 30, 2015 USD ($) | Dec. 31, 2014 PEN | Dec. 31, 2014 USD ($) | Dec. 31, 2005 item | Dec. 31, 1997
Mexico |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other commitments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitment for capital projects |  |  |  |  |  |  |  |  |  |  |  |  | $ 348.6 |  |  |  |
Tia Maria | Peru |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other commitments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Project Budget |  |  |  |  |  |  |  |  |  |  |  |  | 1,400.0 |  |  |  |
Annual production ( in tons) | T |  |  |  |  |  |  |  |  |  |  | 120,000 |  |  |  |  |  |
Distance of sea water transportation |  |  |  |  |  |  | 15.5 | 25 |  |  |  |  |  |  |  |  |
Additional investment in desalinization plant |  |  |  |  |  |  |  |  |  |  |  |  | 95.0 |  |  |  |
Height above sea level of the desalinization plant |  |  |  |  | 1,000 | 3,300 |  |  |  |  |  |  |  |  |  |  |
Term life of environmental project (in years) |  |  | 20 years |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |
Amount expended in current year |  |  |  |  |  |  |  |  |  |  |  |  | 360.2 |  |  |  |
Toquepala Concentrator Expansion | Peru |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other commitments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Project Budget |  |  |  |  |  |  |  |  |  |  |  |  | 1,200.0 |  |  |  |
Amount expended in current year |  |  |  |  |  |  |  |  |  |  |  |  | 372.3 |  |  |  |
Amount committed to funding for social and infrastructure improvement projects |  |  |  |  |  |  |  |  |  |  |  |  |  | PEN 100.0 | $ 33.0 |  |
Amount paid-out for development projects in the Candarave province |  |  |  |  |  |  |  |  |  |  |  | PEN 445.0 | $ 143.0 |  |  |  |
MGE |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other commitments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of power plants | item |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 |
Percentage of supply to third-party energy users |  |  |  |  |  |  |  |  | 12.00% |  |  |  |  |  |  |  |
MGE | Mexico |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other commitments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of power plants | item |  |  |  |  |  |  |  |  |  | 2 |  |  |  |  |  |  |
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 |  |  |  |  |  |
Enersur | Power purchase agreements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other commitments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Term of power purchase agreement related to sale of power plant |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 20 years
Electroperu S.A | Power purchase agreements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other commitments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Term of power purchase agreement related to sale of power plant | 10 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase agreement, contracted power capacity (in megawatts) | MW | 120 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Number of workers directly expected to be employed during the operation of the environmental project. + References No definition available. + Details
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- Definition Number of workers indirectly expected to be employed during the operation of the environmental project. + References No definition available. + Details
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Balance Type: | na
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Balance Type: | na
Period Type: | duration

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- Definition Represents the original term (in years) of the power purchase agreement completed in connection with the sale of a power plant to an independent power company. + References No definition available. + Details
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Data Type: | xbrli:durationItemType
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- Definition Represent the percentage of power supply to third-party energy users out of power output from plant by the related party. + References No definition available. + Details
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