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COMMITMENTS AND CONTINGENCIES: (Details 3) In Millions, unless otherwise specified | 12 Months Ended | 1 Months Ended | 6 Months Ended | 3 Months Ended |  | 6 Months Ended | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended | 6 Months Ended
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Dec. 31, 1997 Power purchase agreements Enersur | Jun. 30, 2014 Peruvian operations Power purchase agreements Electroperu S.A MW | Jul. 31, 2014 Peruvian operations Power purchase agreements Kallpa MW | Jun. 30, 2014 Mexican Operations USD ($) | Dec. 31, 2013 Tia Maria Peruvian operations item | Jun. 30, 2014 Tia Maria Peruvian operations USD ($) | Jun. 30, 2014 Toquepala Concentrator Expansion Copper T | Jun. 30, 2014 Toquepala Concentrator Expansion Molybdenum T | Nov. 30, 2013 Toquepala Concentrator Expansion Peruvian operations USD ($) | Nov. 30, 2013 Toquepala Concentrator Expansion Peruvian operations PEN | Feb. 28, 2013 Toquepala Concentrator Expansion Peruvian operations USD ($) item | Feb. 28, 2013 Toquepala Concentrator Expansion Peruvian operations PEN | Jun. 30, 2013 Toquepala Concentrator Expansion Peruvian operations USD ($) | Jun. 30, 2013 Toquepala Concentrator Expansion Peruvian operations PEN | Jun. 30, 2014 MGE | Dec. 31, 2005 MGE item | Jun. 30, 2014 MGE Mexican Operations item
Other commitments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of work-shops successfully held |  |  |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |
Total spending for the project |  |  |  |  |  | $ 537.0 |  |  |  |  |  |  |  |  |  |  |
Equipment reassigned to other operations, carrying value |  |  |  |  |  | 189.5 |  |  |  |  |  |  |  |  |  |  |
Term of power purchase agreement related to sale of power plant | 20 years | 20 years | 10 years |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of provinces for which final agreement reached |  |  |  |  |  |  |  |  |  |  | 1 | 1 |  |  |  |  |
Number of megawatt supply energy for which the entity signed the agreement |  | 120 | 120 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated increase in annual production (in tons) |  |  |  |  |  |  | 100,000 | 3,100 |  |  |  |  |  |  |  |  |
Amount committed to funding for development projects in the Candarave province |  |  |  |  |  |  |  |  |  |  | 100 | 255 |  |  |  |  |
Amount paid-out for development projects in the Candarave province |  |  |  |  |  |  |  |  |  |  |  |  | 17 | 45 |  |  |
Amount committed to funding for development projects in the Jorge Basadre province |  |  |  |  |  |  |  |  | 36 | 100 |  |  |  |  |  |  |
Number of power plants |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 | 2
Percentage of supply to third-party energy users |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 12.00% |  |
Commitment for capital projects |  |  |  | $ 368.3 |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Represents the amount committed to funding for development projects in the Candarave province. + References No definition available. + Details
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- Definition Represents the amount committed to funding for development projects in the Jorge Basadre province. + References No definition available. + Details
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- Definition The total capital expenditure related to mining projects. + References No definition available. + Details
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- Definition Represents the amount paid out in the period for development projects in the Candarave province. + References No definition available. + Details
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- Details
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- Definition Capital expansion programs at the Mexican operations that are scheduled to be expended in the next twelve months. + References No definition available. + Details
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- Definition Represents the estimated increase in annual production. + References No definition available. + Details
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- Definition The carrying amount on the books of the entity of the long lived assets held for use. + References No definition available. + Details
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- Definition Represents the supply energy for which the entity signed the agreement, expressed in megawatts. + References No definition available. + Details
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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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