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COMMITMENTS AND CONTINGENCIES: - Litigation Matters (Details) $ in Millions |  | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Aug. 22, 2018 USD ($) | Sep. 30, 2018 lawsuit item | Dec. 31, 2012 item | Dec. 31, 2005 item | Sep. 30, 2017 USD ($) | Mar. 31, 2012
Tia Maria |  |  |  |  |  |
Litigation Matter |  |  |  |  |  |
Number of lawsuits | lawsuit |  | 3 |  |  |  |
Grupo Mexico or Americas Mining |  |  |  |  |  |
Litigation Matter |  |  |  |  |  |
Amount of Litigation settlement award | $ | $ 50 |  |  |  |  |
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 |  | 71.00% |  |  |  |
Total number of workers |  | 4,867 |  |  |  |
Number of labor unions |  | 6 |  |  |  |
Number of labor unions represent majority of workers |  | 1 |  |  |  |
Number of labor unions other than majority workers unions |  | 5 |  |  |  |
Term of agreement |  | 3 years |  |  |  |
Number of unsigned unions |  | 2 |  |  |  |
Annual salary increase (as a percent) |  | 5.00% |  |  |  |
Mexico | San Martin |  |  |  |  |  |
Litigation Matter |  |  |  |  |  |
Budgeted cost for rehabilitation of mine | $ |  |  |  |  | $ 77 |
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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- Definition Percentage of voting equity interests acquired at the acquisition date in the business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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