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Note 7 - Income and Mining Taxes - Components of the Net Deferred Tax Asset (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | --- | ---
Accrued reclamation costs | $ 31,558 | $ 32,938 |  |
Deferred exploration | 17,959 | 11,623 |  |
Foreign net operating losses | 18,152 | 13,303 |  |
Domestic net operating losses | 213,637 | 198,438 |  |
Pension and benefit obligation | 1,824 | 12,341 |  |
Foreign exchange loss | 19,542 | 19,808 |  |
Foreign tax credit carryforward | 2,493 | 3,358 |  |
Miscellaneous | 29,505 | 18,385 |  |
Total deferred tax assets | 334,670 | 310,194 |  |
Valuation allowance | (39,152) | (77,210) | $ (86,634) | $ (94,981)
Total deferred tax assets | 295,518 | 232,984 |  |
Miscellaneous | (2,751) | (2,551) |  |
Properties, plants and equipment | (396,911) | (383,612) |  |
Total deferred tax liabilities | (399,662) | (386,163) |  |
Net deferred tax liability | $ (104,144) | $ (153,179) |  |

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