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RECLAMATION AND CLOSURE COST PROVISION - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Disclosure of other provisions [line items] |  |
Change in the discount rate | 1.00% |
Increase (decrease) through change in discount rate, other provisions | $ 18.1 | $ 11.1
Minimum | Reclamation and closure cost provision |  |
Disclosure of other provisions [line items] |  |
Discount rate applied to cash flow projections | 0.70% | 1.80%
Maximum | Reclamation and closure cost provision |  |
Disclosure of other provisions [line items] |  |
Discount rate applied to cash flow projections | 12.10% | 9.90%

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- Definition The discount rate applied to cash flow projections for a cash-generating unit (group of units). [Refer: Cash-generating units [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 36 -IssueDate 2020-01-01 -Paragraph 134 -Subparagraph d -Clause v -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=36&code=ifrs-tx-2020-en-r&anchor=para_134_d_v&doctype=Standard -URIDate 2020-01-01 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 36 -IssueDate 2020-01-01 -Paragraph 134 -Subparagraph e -Clause v -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=36&code=ifrs-tx-2020-en-r&anchor=para_134_e_v&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The increase (decrease) in other provisions resulting from a change in discount rate. [Refer: Other provisions] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 37 -IssueDate 2020-01-01 -Paragraph 84 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=37&code=ifrs-tx-2020-en-r&anchor=para_84_e&doctype=Standard -URIDate 2020-01-01 + Details
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