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Income Taxes - Deductible Temporary Differences (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unrecognised deductible temporary differences $ 812,196 $ 738,489
Operating tax loss    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unrecognised deductible temporary differences 366,351 284,626
Net capital tax loss    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unrecognised deductible temporary differences 35,801 32,378
Resource Pools and Other Tax Credits [Member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unrecognised deductible temporary differences 49,230 48,773
Financing fees    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unrecognised deductible temporary differences 1,050 2,003
Mineral properties, plant, and equipment    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unrecognised deductible temporary differences 127,945 107,124
Closure and decommissioning costs    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unrecognised deductible temporary differences 143,080 136,728
Exploration and Other Expenses not Currently Deductible [Member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unrecognised deductible temporary differences 33,837 68,266
Intercompany debt    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unrecognised deductible temporary differences 17,956 12,160
Doubtful debt and inventory    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unrecognised deductible temporary differences 24,624 41,378
Payroll and vacation accruals    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unrecognised deductible temporary differences 6,168 1,491
Other temporary differences    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unrecognised deductible temporary differences $ 6,154 $ 3,562