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v3.21.1

Income Taxes (Schedule of Deferred Tax Assets and Liabilities) (Details) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |
Deferred tax assets |  |  | $ 56,556 | $ 39,739
Deferred tax liabilities |  |  | (76,055) | (60,654)
Net deferred tax liabilities |  |  | (19,499) | (20,915)
Net deferred tax liabilities | $ (19,499) | $ (20,915) | (19,499) | (20,915)
Reconciliation of changes in deferred tax liability (asset) [abstract] |  |  |  |
Beginning balance | 20,915 | 31,444 |  |
Deferred income tax (recovery) expense through income statement | (1,416) | (12,456) |  |
Deferred income tax expense through equity |  | 1,927 |  |
Ending balance | $ 19,499 | $ 20,915 |  |
Reclamation and closure cost obligation [member] |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |
Deferred tax assets |  |  | 13,080 | 9,530
Carried forward tax loss [member] |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |
Deferred tax assets |  |  | 17,729 | 14,020
Accounts payable and accrued liability [member] |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |
Deferred tax assets |  |  | 16,437 | 7,731
Deductibility of resource taxes [member] |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |
Deferred tax assets |  |  | 3,414 | 3,140
Lease obligations [member] |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |
Deferred tax assets |  |  | 5,769 | 5,317
Other deferred tax assets [member] |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |
Deferred tax assets |  |  | 127 | 1
Mineral Properties [member] |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |
Deferred tax liabilities |  |  | (55,134) | (44,825)
Mining and foreign withholding taxes [member] |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |
Deferred tax liabilities |  |  | (4,862) | (5,281)
Equipment and Building [member] |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |
Deferred tax liabilities |  |  | (1,928) | (3,621)
Convertible Debentures [member] |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |
Deferred tax liabilities |  |  | (1,544) | (1,857)
Inflation [member] |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |
Deferred tax liabilities |  |  | (11,210) | (4,939)
Other deferred tax liabilities [member] |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |
Deferred tax liabilities |  |  | $ (1,377) | $ (131)

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