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COMMITMENTS AND CONTINGENCIES: (Details) In Millions, unless otherwise specified | 9 Months Ended | 0 Months Ended | 3 Months Ended | 9 Months Ended | 0 Months Ended | 1 Months Ended | 9 Months Ended | 12 Months Ended | 9 Months Ended | 12 Months Ended
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Sep. 30, 2014 USD ($) | Sep. 30, 2013 USD ($) | Sep. 11, 2014 Buenavista del Cobre, S.A. de C.V USD ($) | Sep. 11, 2014 Buenavista del Cobre, S.A. de C.V MXN | Aug. 06, 2014 Buenavista del Cobre, S.A. de C.V m3 km | Sep. 30, 2014 Buenavista del Cobre, S.A. de C.V USD ($) | Sep. 30, 2014 Buenavista del Cobre, S.A. de C.V MXN | Sep. 30, 2014 Buenavista del Cobre, S.A. de C.V country | Sep. 30, 2014 Maximum Buenavista del Cobre, S.A. de C.V USD ($) | Sep. 30, 2014 Maximum Buenavista del Cobre, S.A. de C.V MXN | Apr. 08, 2014 Peruvian operations | Mar. 31, 2014 Peruvian operations | Sep. 30, 2014 Peruvian operations USD ($) item | Sep. 30, 2013 Peruvian operations USD ($) | Dec. 31, 2013 Peruvian operations | Sep. 30, 2014 Peruvian operations Maximum | Sep. 30, 2014 Mexican operations USD ($) | Sep. 30, 2013 Mexican operations USD ($) | Dec. 31, 2011 Mexican operations category person
Environmental costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Environmental capital expenditure | $ 110.3 | $ 105.7 |  |  |  |  |  |  |  |  |  |  | $ 92.8 | $ 75.4 |  |  | $ 17.5 | $ 30.3 |
Period required for ambient air monitoring as per environmental regulation |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 12 months |  |  |  |
Revised air quality standards for sulfur dioxide as per new environmental regulation (in micrograms per cubic meter) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 20 |  |  |
Air quality standards level for sulfur dioxide to be maintained when emission is excess than specified as per new environmental regulation (in micrograms per cubic meter) |  |  |  |  |  |  |  |  |  |  |  |  | 80 |  |  |  |  |  |
Number of atmospheric basins established that require further attention |  |  |  |  |  |  |  |  |  |  |  |  | 3 |  |  |  |  |  |
Number of months for identification of contaminated sites and around in facilities |  |  |  |  |  |  |  |  |  |  |  | 12 months |  |  |  |  |  |  |
Period for preparation of decontamination plan |  |  |  |  |  |  |  |  |  |  |  | 24 months |  |  |  |  |  |  |
Period of extension for preparation of decontamination plan |  |  |  |  |  |  |  |  |  |  |  | 1 year |  |  |  |  |  |  |
Number of days in which results of soil confirmation tests are to be presented to authorities |  |  |  |  |  |  |  |  |  |  |  | 30 days |  |  |  |  |  |  |
Period within which the plan must be reported to the government |  |  |  |  |  |  |  |  |  |  | 1 year |  |  |  |  |  |  |  |
Number of categories of collective actions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3
Minimum number of people claiming injury due to collective action initiative in Civil Federal Procedures Code (CFPC) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 30
Volume of copper sulfate solution (in cubic meters) |  |  |  |  | 40,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Distance of pond under construction from mine (in kilometers) |  |  |  |  | 10 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of administrative fines and sanctions (in pesos) |  |  |  |  |  |  |  |  | 3 | 40 |  |  |  |  |  |  |  |  |
Amount committed to the Mexican Federal Government to establish a trust (in peso) |  |  | 150 | 2,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of countries in which riverside residents are affected by the spill |  |  |  |  |  |  |  | 7 |  |  |  |  |  |  |  |  |  |  |
Amount deposited in the trust (in peso) |  |  |  |  |  | $ 37 | 500 |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Represents the amount committed to the Mexican Federal Government to establish a trust to support the remedial efforts undertaken and to comply with the environmental remediation plan. + References No definition available. + Details
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- Details
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