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Income Taxes - Deductible Temporary Differences (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unrecognised deductible temporary differences $ 889,805 $ 316,409
Tax loss (revenue in nature)    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unrecognised deductible temporary differences 239,216 131,179
Net tax loss (capital in nature)    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unrecognised deductible temporary differences 34,646 14,456
Resource pools and other tax credits    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unrecognised deductible temporary differences 260,413 18,266
Financing fees    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unrecognised deductible temporary differences 2,849 785
Mineral properties, plant, and equipment    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unrecognised deductible temporary differences 118,380 22,669
Closure and decommissioning costs    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unrecognised deductible temporary differences 141,018 33,835
Exploration and other expenses not currently deductible    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unrecognised deductible temporary differences 53,595 51,175
Intercompany debt    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unrecognised deductible temporary differences 11,339 10,160
Doubtful debt and inventory    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unrecognised deductible temporary differences 23,895 24,840
Payroll and vacation accruals    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unrecognised deductible temporary differences 1,055 827
Other temporary differences    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unrecognised deductible temporary differences $ 3,399 $ 8,217