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COMMITMENTS AND CONTINGENCIES: - Litigation Matters (Details) $ in Millions |  | 1 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Oct. 04, 2016 shares | Mar. 31, 2015 item | Mar. 31, 2012 item | May 31, 2011 item | Aug. 31, 2009 USD ($) | Apr. 30, 1996 person | Sep. 30, 2016 PEN ha item lawsuit plaintiff item / shares | Dec. 31, 2012 item | Dec. 31, 2005 item | Dec. 31, 1992 | Dec. 31, 1978 | Dec. 31, 1971 | Sep. 23, 2015 shares
Tia Maria |  |  |  |  |  |  |  |  |  |  |  |  |
Litigation Matter |  |  |  |  |  |  |  |  |  |  |  |  |
Area of mining concession (in hectares) | ha |  |  |  |  |  |  | 32,989.64 |  |  |  |  |  |
Number of lawsuits | lawsuit |  |  |  |  |  |  | 4 |  |  |  |  |  |
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 |  |  |  |  |  |  |  |
Garcia Ataucuri and Others against SCC's Peruvian Branch |  |  |  |  |  |  |  |  |  |  |  |  |
Litigation Matter |  |  |  |  |  |  |  |  |  |  |  |  |
Number of former Branch workers |  | 104 |  | 216 |  |  |  |  |  |  |  |  |
Armando Cornejo Flores Against SCC Peruvian Branch former workers |  |  |  |  |  |  |  |  |  |  |  |  |
Litigation Matter |  |  |  |  |  |  |  |  |  |  |  |  |
Number of former Branch workers |  |  | 37 |  |  |  | 5 |  |  |  |  |  |
Garcia Ataucuri litigation |  |  |  |  |  |  |  |  |  |  |  |  |
Litigation Matter |  |  |  |  |  |  |  |  |  |  |  |  |
Number of plaintiffs involved in lawsuits filed | plaintiff |  |  |  |  |  |  | 800 |  |  |  |  |  |
Mexico Generadora de Energia S. de R.L. ("MGE") | Controladora de Infraestructura Energetica Mexico, S. A. de C. V. |  |  |  |  |  |  |  |  |  |  |  |  |
Litigation Matter |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of interest acquired |  |  | 99.999% |  |  |  |  |  |  |  |  |  |
Peru |  |  |  |  |  |  |  |  |  |  |  |  |
Litigation Matter |  |  |  |  |  |  |  |  |  |  |  |  |
Statutory participation of mine workers in pre-tax profit (as a percent) |  |  |  |  |  |  |  |  |  | 8.00% |  | 10.00% |
Statutory participation of mine workers in pre-tax profit paid in cash (as a percent) |  |  |  |  |  |  |  |  |  | 100.00% | 4.00% | 40.00% |
Statutory participation of mine workers in pre-tax profit received as equity interest of enterprise (as a percent) |  |  |  |  |  |  |  |  |  |  |  | 60.00% |
Percentage of pre-tax profits delivered as "labor shares" |  |  |  |  |  |  |  |  |  |  | 5.50% |  |
Peru | Garcia Ataucuri and Others against SCC's Peruvian Branch |  |  |  |  |  |  |  |  |  |  |  |  |
Litigation Matter |  |  |  |  |  |  |  |  |  |  |  |  |
Number of former employees who filed the complaint | person |  |  |  |  |  | 900 |  |  |  |  |  |  |
Damages sought by the plaintiff (includes old soles and labor shares) |  |  |  |  |  |  | 38,763,806.80 |  |  |  |  |  |
Damages sought by the plaintiff | PEN |  |  |  |  |  |  | PEN 3.876380680 |  |  |  |  |  |
Face value of one labor share | item / shares |  |  |  |  |  |  | 100 |  |  |  |  |  |
Labor shares issued by the Branch (as a percent) |  |  |  |  |  |  | 100.00% |  |  |  |  |  |
Plaintiffs do not represent the percent of SCC's eligible employees |  |  |  |  |  |  | 100.00% |  |  |  |  |  |
Soles de oro equivalent to today's one sol |  |  |  |  |  |  | 1,000,000,000 |  |  |  |  |  |
Number of shares seized as security for damages sought (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  |  | 10,501,857
Labor share exchange ratio | 10 |  |  |  |  |  |  |  |  |  |  |  |
Investment shares exchange ratio | 1,000 |  |  |  |  |  |  |  |  |  |  |  |
Number of labor shares converted to investment shares | shares | 1,980 |  |  |  |  |  |  |  |  |  |  |  |
Peru | Labor Matters |  |  |  |  |  |  |  |  |  |  |  |  |
Litigation Matter |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of labor unionized |  |  |  |  |  |  | 74.00% |  |  |  |  |  |
Total number of workers |  |  |  |  |  |  | 3,366 |  |  |  |  |  |
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% |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of interest acquired |  |  |  |  |  |  |  | 99.999% |  |  |  |  |

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- Definition Represents the number of former employees who filed the complaint seeking the delivery of a substantial number of its labor shares (acciones laborales) plus dividends on such shares. + References No definition available. + Details
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- Definition Represents the percentage of pre-tax profit provided to mine workers in equity interest of the enterprise in statutory participation enacted by the law. + References No definition available. + Details
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- Definition Represents the portion of pre-tax profit provided to mine workers as equity pursuant to government legislation. + References No definition available. + Details
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Balance Type: | na
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Balance Type: | na
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Balance Type: | na
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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=65885119&loc=d3e1392-128463 + Details
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