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INCOME AND MINING TAXES - Income Before Income Taxes (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Income Tax Contingency [Line Items] |  |  |
Income before income and mining taxes | $ 414,758 | $ 201,791 | $ 136,657
United States |  |  |
Income Tax Contingency [Line Items] |  |  |
Income before income and mining taxes | 138,230 | 119,654 | 61,198
Canada |  |  |
Income Tax Contingency [Line Items] |  |  |
Income before income and mining taxes | 26,752 | 26,207 | 71,537
Turkey |  |  |
Income Tax Contingency [Line Items] |  |  |
Income before income and mining taxes | 186,971 | 41,385 | 0
Other Foreign |  |  |
Income Tax Contingency [Line Items] |  |  |
Income before income and mining taxes | $ 62,805 | $ 14,545 | $ 3,922

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