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COMMITMENTS AND CONTINGENCIES: - Litigation Matters (Details) $ in Millions | 1 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Apr. 30, 2017 T | Aug. 31, 2009 USD ($) | Sep. 30, 2017 ha lawsuit item | Dec. 31, 2012 item | Dec. 31, 2005 item | Mar. 31, 2012
Tia Maria |  |  |  |  |  |
Litigation Matter |  |  |  |  |  |
Area of mining concession (in hectares) | ha |  |  | 32,989.64 |  |  |
Number of lawsuits | lawsuit |  |  | 5 |  |  |
Virgen Maria |  |  |  |  |  |
Litigation Matter |  |  |  |  |  |
Area of mining concession (in hectares) | ha |  |  | 943.72 |  |  |
Percentage of mining concession |  |  | 2.90% |  |  |
Purchase price of shares paid to former stockholders | $ |  | $ 2 |  |  |  |
Mexico Generadora de Energia S. de R.L. ("MGE") | Controladora de Infraestructura Energetica Mexico, S. A. de C. V. |  |  |  |  |  |
Litigation Matter |  |  |  |  |  |
Acquisition percentage |  |  |  |  |  | 99.999%
Peru | Labor Matters |  |  |  |  |  |
Litigation Matter |  |  |  |  |  |
Percentage of labor unionized |  |  | 70.00% |  |  |
Total number of workers |  |  | 4,585 |  |  |
Number of labor unions |  |  | 5 |  |  |
Number of labor unions represent majority of workers |  |  | 1 |  |  |
Number of labor unions other than majority workers unions |  |  | 4 |  |  |
Term of agreement |  |  | 3 years |  |  |
Annual salary increase (as a percent) |  |  | 5.00% |  |  |
Number of tons of copper decrease of production due to stoppage | T | 1,400 |  |  |  |  |
Mexico | Mexico Generadora de Energia S. de R.L. ("MGE") |  |  |  |  |  |
Litigation Matter |  |  |  |  |  |
Number of power plants |  |  |  | 2 | 2 |
Mexico | Mexico Generadora de Energia S. de R.L. ("MGE") | Controladora de Infraestructura Energetica Mexico, S. A. de C. V. |  |  |  |  |  |
Litigation Matter |  |  |  |  |  |
Acquisition percentage |  |  |  | 99.999% |  |

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