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COMMITMENTS AND CONTINGENCIES: (Details) MXN in Millions, $ in Millions |  |  |  |  | 1 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
Mar. 02, 2015 MXN item | Mar. 02, 2015 USD ($) item | Sep. 15, 2014 MXN | Sep. 15, 2014 USD ($) | Aug. 29, 2014 | Aug. 06, 2014 km m³ | Mar. 31, 2014 | Sep. 30, 2015 item | Jun. 30, 2015 item | Dec. 31, 2014 item | Dec. 31, 2015 MXN item / m³ item | Dec. 31, 2015 USD ($) item / m³ item | Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($) | Dec. 31, 2011 category person
Environmental costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Environmental capital investment | $ |  |  |  |  |  |  |  |  |  |  |  | $ 120.8 | $ 152.2 | $ 116.7 |
Number of collective action lawsuits |  |  |  |  |  |  |  |  | 6 | 6 |  |  |  |  |
Number of subsidiaries against which lawsuits were filed |  |  |  |  |  |  |  |  |  |  | 2 | 2 |  |  |
Number of lawsuits dismissed |  |  |  |  |  |  |  |  |  |  | 3 | 3 |  |  |
Number of constitutional action lawsuits |  |  |  |  |  |  |  | 4 |  |  |  |  |  |  |
Buenavista del Cobre, S.A. de C.V |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Environmental costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Volume of copper sulfate solution (in cubic meters) | m³ |  |  |  |  |  | 40,000 |  |  |  |  |  |  |  |  |
Distance of pond under construction from mine (in kilometers) | km |  |  |  |  |  | 10 |  |  |  |  |  |  |  |  |
Number of zones |  |  |  |  |  |  |  |  |  |  | 5 | 5 |  |  |
Amount committed to the Mexican Federal Government to establish a trust |  |  | MXN 2,000.0 | $ 150.0 |  |  |  |  |  |  |  |  |  |  |
Amount contributed to the Mexican Federal Government (in peso) | MXN |  |  |  |  |  |  |  |  |  |  | MXN 1,000.0 |  |  |  |
Number of administrative proceedings | 4 | 4 |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of administrative fines and sanctions | MXN 23.5 | $ 1.7 |  |  |  |  |  |  |  |  |  |  |  |  |
Number of workers hired |  |  |  |  | 1,200 |  |  |  |  |  |  |  |  |  |
Estimated total damages | $ |  |  |  |  |  |  |  |  |  |  |  | $ 136.4 |  |  |
Amount already paid | $ |  |  |  |  |  |  |  |  |  |  |  | 39.9 |  |  |
Amount deposited in the trust |  |  |  |  |  |  |  |  |  |  | MXN 1,000.0 | $ 74.9 |  |  |
Number of civil actions seeking damages |  |  |  |  |  |  |  |  |  |  | 8 | 8 |  |  |
Peru |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Environmental costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Environmental capital investment | $ |  |  |  |  |  |  |  |  |  |  |  | $ 98.8 | 127.8 | 76.9 |
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) | item / m³ |  |  |  |  |  |  |  |  |  |  | 80 | 80 |  |  |
Number of atmospheric basins established that require further attention |  |  |  |  |  |  |  |  |  |  | 3 | 3 |  |  |
Number of months for identification of contaminated sites and around in facilities |  |  |  |  |  |  | 12 months |  |  |  |  |  |  |  |
Period for preparation of decontamination plan |  |  |  |  |  |  | P24M |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |
Peru | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Environmental costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revised air quality standards for sulfur dioxide as per new environmental regulation (in micrograms per cubic meter) | item / m³ |  |  |  |  |  |  |  |  |  |  | 20 | 20 |  |  |
Mexico |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Environmental costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Environmental capital investment | $ |  |  |  |  |  |  |  |  |  |  |  | $ 22.0 | $ 24.4 | $ 39.8 |
Number of categories of collective actions | category |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3
Minimum number of people claiming injury due to collective action initiative in Civil Federal Procedures Code (CFPC) | person |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 30
Acciones Colectivas de Sinaloa |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Environmental costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of collective action lawsuits |  |  |  |  |  |  |  |  |  |  | 2 | 2 |  |  |
Francisco Garcia Enriquez |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Environmental costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of constitutional action lawsuits |  |  |  |  |  |  |  | 2 |  |  |  |  |  |  |

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- Definition Represents the amount contributed to the Mexican Federal Government trust. + References No definition available. + Details
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- Definition Represents the amount deposited in the trust to compensate claims as they arise. + References No definition available. + Details
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- Definition Represents the maximum amount of administrative fines and sanctions, which the company may require to pay. + References No definition available. + Details
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- Definition Represents the distance of pond under construction from mine. + References No definition available. + Details
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- References No definition available. + Details
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- Definition Represents the number of atmospheric basins established environmental agency of the government which require further attention as per the new environmental regulations. + References No definition available. + Details
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- Definition Represents the number of workers hired for the rehabilitation of the entity's mining unit. + References No definition available. + Details
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- Definition Represents the period in which the entity has to to identify contaminated sites in and around its facilities and present a Report of Identified Contaminated Sites. + References No definition available. + Details
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- Definition Represents the number of days in which results of soil confirmation tests are to be presented to authorities. + References No definition available. + Details
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- Definition Represents the amount paid previous to the establishment of the trust. + References No definition available. + Details
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- Definition Represents the revised standard for concentration of an air pollutant (e.g. ozone) which is given in micrograms (one-millionth of a gram) as per the new environmental regulations. + References No definition available. + Details
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- Definition Represents the standard for concentration of an air pollutant level which is given in micrograms (one-millionth of a gram) to be maintained by areas which are having emission in excess than specified as per the new environmental regulations. + References No definition available. + Details
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- Definition Represents the volume of copper sulfate solution, which accidentally spilled at the mine of Buenavista del Cobre, S.A. de C.V. + References No definition available. + Details
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- Definition Amount of environmental remediation costs capitalized. These expenditures may relate to long-lived improvements in operating facilities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 25 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=39739230&loc=d3e11660-110855 + Details
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