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INCOME AND MINING TAXES - Tax Cuts and Jobs Act (the "Act") and Argentinian Tax Reform (Details) | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
INCOME AND MINING TAXES. |  |  |
Statutory tax rate (as a percent) | 21.00% | 21.00% | 21.00%

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