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v3.20.4

Income and Mining Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Deferred tax liabilities: |  |
Mineral properties | $ 0 | $ 25,691
Inventory | 5 | 847
Royalty and other long-term debt | 1,094 | 0
Foreign subsidiaries - unremitted earnings | 99 | 50
Gross deferred tax liabilities | 1,198 | 26,588
Deferred tax assets: |  |
Net operating loss carryforwards | 241,985 | 219,192
Deferred Tax Assets, Mineral Properties | 1,907 | 0
Property, plant, and equipment | 10,841 | 20,212
Mining Royalty Tax | 7,447 | 6,764
Capital loss carryforwards | 17,341 | 21,956
Asset retirement obligation | 38,761 | 34,134
Unrealized foreign currency loss and other | 3,386 | 9,133
Royalty and other long-term debt | 0 | 6,235
Accrued expenses | 16,849 | 8,899
Tax credit carryforwards | 29,809 | 29,881
Gross deferred tax assets | 368,326 | 356,406
Valuation allowance | (401,304) | (371,277)
Deferred tax assets, net of valuation allowance | (32,978) | (14,871)
Net deferred tax liabilities | $ 34,176 | $ 41,459

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