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Impairment of Non-Current Assetes - Key Assumptions and Sensitivity Analysis (Details) - $ / Ounce | Dec. 31, 2019 | Dec. 31, 2018
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Bottom of range [member] |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |
Discount rate applied to cash flow projections | 4.00% | 4.50%
Top of range [member] |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |
Discount rate applied to cash flow projections | 12.30% | 9.80%
Silver, Ounces | Weighted average [member] |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |
Metal prices used to calculate recoverable amounts | 17.94 | 17.07
Gold, Ounces | Weighted average [member] |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |
Metal prices used to calculate recoverable amounts | 1,474 | 1,300
Weighted average cost of capital, measurement input [member] |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |
Significant unobservable inputs, assets | 0.037 | 0.053

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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 2019-01-01 -Paragraph 134 -Subparagraph d -Clause v -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=36&code=ifrs-tx-2019-en-r&anchor=para_134_d_v&doctype=Standard -URIDate 2019-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 36 -IssueDate 2019-01-01 -Paragraph 134 -Subparagraph e -Clause v -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=36&code=ifrs-tx-2019-en-r&anchor=para_134_e_v&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The value of significant unobservable input used in the measurement of the fair value of assets. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 13 -IssueDate 2019-01-01 -Paragraph 93 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=13&code=ifrs-tx-2019-en-r&anchor=para_93_d&doctype=Standard -URIDate 2019-03-27 + Details
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