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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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Percentage of voting equity interests acquired at the acquisition date in the business combination.

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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

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