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COMMITMENTS AND CONTINGENCIES: - Environmental Costs (Details) $ in Millions, MXN in Billions |  |  | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | ---
Sep. 26, 2016 lawsuit | Sep. 15, 2014 MXN | Sep. 15, 2014 USD ($) | Apr. 30, 2017 item m³ | Mar. 31, 2014 | Mar. 31, 2017 USD ($) lawsuit item | Sep. 30, 2016 lawsuit | Mar. 31, 2016 USD ($) | Jun. 30, 2015 lawsuit item | Dec. 31, 2015 USD ($) lawsuit item | Dec. 31, 2014 item m³ | Dec. 31, 2011 category person | Dec. 31, 2016 lawsuit
Environmental costs |  |  |  |  |  |  |  |  |  |  |  |  |
Environmental capital investment | $ |  |  |  |  |  | $ 38.6 |  | $ 39.2 |  |  |  |  |
Number of collective action lawsuits |  |  |  |  |  |  |  |  | 6 |  |  |  |
Number of subsidiaries against which lawsuits were filed | item |  |  |  |  |  |  |  |  | 2 |  |  |  |
Number of lawsuits dismissed |  |  |  |  |  |  |  |  | 4 |  |  |  |
Remaining number of Collective action lawsuits |  |  |  |  |  |  |  |  | 2 |  |  |  |
Number of constitutional action lawsuits |  |  |  |  |  |  |  |  |  | 4 |  |  |
Number of subsidiaries to which environmental impact authorizations were granted | item |  |  |  |  |  |  |  |  |  | 1 |  |  |
Buenavista del Cobre, S.A. de C.V |  |  |  |  |  |  |  |  |  |  |  |  |
Environmental costs |  |  |  |  |  |  |  |  |  |  |  |  |
Volume of copper sulfate solution (in cubic meters) | m³ |  |  |  |  |  |  |  |  |  |  | 40,000 |  |
Excess provision reversed on closure of trust | $ |  |  |  |  |  | $ 10.2 |  |  |  |  |  |  |
Estimated total damages | $ |  |  |  |  |  |  |  |  |  | $ 136.4 |  |  |
Number of civil actions seeking damages |  |  |  |  |  | 26 |  |  |  | 8 |  |  | 3
Buenavista del Cobre, S.A. de C.V | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |
Environmental costs |  |  |  |  |  |  |  |  |  |  |  |  |
Amount committed to the Mexican Federal Government to establish a trust |  | MXN 2 | $ 150.0 |  |  |  |  |  |  |  |  |  |
Buenavista del Cobre, S.A. de C.V | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |
Environmental costs |  |  |  |  |  |  |  |  |  |  |  |  |
Number of workers to clean the river | item |  |  |  |  |  |  |  |  |  |  | 1,200 |  |
Peru |  |  |  |  |  |  |  |  |  |  |  |  |
Environmental costs |  |  |  |  |  |  |  |  |  |  |  |  |
Environmental capital investment | $ |  |  |  |  |  | $ 16.5 |  | 10.1 |  |  |  |  |
Number of atmospheric basins established that require further attention | item |  |  |  |  |  | 3 |  |  |  |  |  |  |
AQS, new hours | item |  |  |  | 24 |  |  |  |  |  |  |  |  |
AQS, new micrograms | m³ |  |  |  | 250 |  |  |  |  |  |  |  |  |
AQS, old hours | item |  |  |  |  |  |  |  |  |  |  | 24 |  |
Revised air quality standards for sulfur dioxide as per new environmental regulation (in micrograms per cubic meter) | m³ |  |  |  |  |  |  |  |  |  |  | 20 |  |
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 |  |  |  |  |  |  |  |
Mexico |  |  |  |  |  |  |  |  |  |  |  |  |
Environmental costs |  |  |  |  |  |  |  |  |  |  |  |  |
Environmental capital investment | $ |  |  |  |  |  | $ 22.1 |  | $ 29.1 |  |  |  |  |
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 |  |  |  |
Number of lawsuits dismissed | 1 |  |  |  |  |  |  |  |  |  |  |  |
Francisca Garcia Enriquez |  |  |  |  |  |  |  |  |  |  |  |  |
Environmental costs |  |  |  |  |  |  |  |  |  |  |  |  |
Number of constitutional action lawsuits |  |  |  |  |  |  |  |  |  | 2 |  |  |
Maria Elena Heredia Bustamante et al, Martin Eligio Ortiz Gamez et al and Maria de los Angeles Enriquez Bacame et al |  |  |  |  |  |  |  |  |  |  |  |  |
Environmental costs |  |  |  |  |  |  |  |  |  |  |  |  |
Number of additional constitutional lawsuits filed |  |  |  |  |  |  | 3 |  |  |  |  |  |

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- Definition Number of subsidiaries to which environmental impact authorizations were granted. + References No definition available. + Details
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