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REVENUE - Narrative (Details) - $ / pound	Dec. 31, 2018	Dec. 31, 2017
Disclosure of Disaggregation of Revenue [Line Items]
Percent change in commodity prices used for sensitivity analysis	10.00%
Gold[member]
Disclosure of Disaggregation of Revenue [Line Items]
Percentage of composition of principal product (as percent)	90.00%
Copper
Disclosure of Disaggregation of Revenue [Line Items]
Average price of sales subject to final settlement (copper in dollars per pound; gold in dollars per oz)	2.71	3.29

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[Line Items] for Disclosure of disaggregation of revenue [Table]

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Percentage of composition of principal product

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Percent change in commodity prices used for sensitivity analysis

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- Definition

The average price of a hedging instrument. [Refer: Hedging instruments [member]]

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 7
-IssueDate 2018-01-01
-Paragraph 23B
-Subparagraph b
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