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ACQUISITIONS - Unaudited Pro Forma Financial Information (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Unaudited Combined Pro Forma Results of Operations |  |
Gold and silver sales | $ 131,072 | $ 131,983
Net (loss) Income | $ (1,093) | $ 17,462
Pro forma net (loss) income per share Basic | $ 0.00 | $ 0.06
Pro forma net (loss) income per share Diluted | $ 0.00 | $ 0.06

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