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IMPAIRMENTS (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract] |  |  |
Impairment of plant and equipment and mineral properties | $ 0 |  |
Impairment of assets to be abandoned of | $ 0 | $ 0 | $ 3,799,000

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