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REVENUE - Provisional Copper and Gold Sales (Details) ozt in Thousands, lb in Millions, $ in Millions | 12 Months Ended
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Dec. 31, 2019 USD ($) $ / ounce $ / pound ozt lb | Dec. 31, 2018 USD ($) $ / pound ozt lb
Disclosure of Disaggregation of Revenue [Line Items] |  |
Percent change in commodity prices used for sensitivity analysis | 10.00% |
Copper |  |
Disclosure of Disaggregation of Revenue [Line Items] |  |
Average price of hedging instrument | $ / pound | 2.80 | 2.71
Volumes subject to final pricing Copper (millions) Gold (000s) | lb | 39 | 51
Impact on net income before taxation of 10% movement in market price US$ | $ 11 | $ 14
Gold[member] |  |
Disclosure of Disaggregation of Revenue [Line Items] |  |
Average price of hedging instrument | $ / ounce | 1,524 |
Volumes subject to final pricing Copper (millions) Gold (000s) | ozt | 15 | 0
Impact on net income before taxation of 10% movement in market price US$ | $ 2 | $ 0

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- Definition The average price of a hedging instrument. [Refer: Hedging instruments [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2018-01-01 -Paragraph 23B -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2018-03-01&anchor=para_23B_b&doctype=Standard -URIDate 2018-03-16 + Details
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