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Leases - Summary of Changes in ROU Assets (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2019
Changes in Right-of-Use Assets [Roll Forward] |  |  |
Balance, beginning of period | $ 43,361 | $ 30,203 |
Balance, end of period | 33,543 | 43,361 | $ 43,361
Impairment charge | 0 | 40,050 |
Cost [member] |  |  |
Changes in Right-of-Use Assets [Roll Forward] |  |  |
Balance, beginning of period | 60,779 | 34,983 |
Additions | 5,534 | 42,415 |
Transfer out | (10,458) | (16,619) |
Balance, end of period | 55,855 | 60,779 | 60,779
Assets acquired from Tahoe |  |  | 8,500
Accumulated Depreciation [member] |  |  |
Changes in Right-of-Use Assets [Roll Forward] |  |  |
Balance, beginning of period | (17,418) | (4,780) |
Amortization | (14,244) | (20,103) |
Transfer out | 9,350 | 7,465 |
Balance, end of period | $ (22,312) | (17,418) | $ (17,418)
Accumulated Depreciation [member] | Manantial Espejo Mine and COSE and Joaquin Projects [Member] |  |  |
Changes in Right-of-Use Assets [Roll Forward] |  |  |
Impairment charge |  | $ 2,400 |

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- Definition The amount of additions to right-of-use assets. [Refer: Right-of-use assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2020-01-01 -Paragraph 53 -Subparagraph h -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2020-en-r&anchor=para_53_h&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The amount of depreciation of right-of-use assets. [Refer: Depreciation and amortisation expense; Right-of-use assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2020-01-01 -Paragraph 53 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2020-en-r&anchor=para_53_a&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The amount of impairment loss recognised in profit or loss. [Refer: Impairment loss; Profit (loss)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 36 -IssueDate 2020-01-01 -Paragraph 126 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=36&code=ifrs-tx-2020-en-r&anchor=para_126_a&doctype=Standard -URIDate 2020-01-01 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 36 -IssueDate 2020-01-01 -Paragraph 129 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=36&code=ifrs-tx-2020-en-r&anchor=para_129_a&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The amount of assets that represent a lessee's right to use an underlying asset for the lease term. Underlying asset is an asset that is the subject of a lease, for which the right to use that asset has been provided by a lessor to a lessee. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2020-01-01 -Paragraph 53 -Subparagraph j -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2020-en-r&anchor=para_53_j&doctype=Standard -URIDate 2020-01-01 + Details
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