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RECLAMATION AND CLOSURE COST OBLIGATIONS - Additional information (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
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RECLAMATION AND CLOSURE COST OBLIGATIONS |  |
Percentage of annual fees of the value of outstanding letters of credit | 1.50% |
Letters Of Credit [Member] |  |
RECLAMATION AND CLOSURE COST OBLIGATIONS |  |
Exposure to credit risk on loan commitments and financial guarantee contracts | $ 118.9 | $ 110.8
Bottom of range [member] |  |
RECLAMATION AND CLOSURE COST OBLIGATIONS |  |
Discount rate applied to cash flow projections | 1.80% | 1.90%
Description of inflation rates applied to cash flow projections | 1.40% | 1.40%
Top of range [member] |  |
RECLAMATION AND CLOSURE COST OBLIGATIONS |  |
Discount rate applied to cash flow projections | 5.40% | 7.10%
Description of inflation rates applied to cash flow projections | 3.30% | 3.30%

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- Definition The amount of the exposure to credit risk on loan commitments and financial guarantee contracts. [Refer: Loan commitments [member]; Financial guarantee contracts [member]; Credit risk [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2019-01-01 -Paragraph 35H -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2019-en-r&anchor=para_35H&doctype=Standard -URIDate 2019-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2019-01-01 -Paragraph 35I -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2019-en-r&anchor=para_35I&doctype=Standard -URIDate 2019-03-27 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2019-01-01 -Paragraph 35M -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2019-en-r&anchor=para_35M&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The percentage rate of annual fees of the value the outstanding letters credit. + References No definition available. + Details
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