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PLANT AND EQUIPMENT AND CONSTRUCTION IN PROGRESS - Additional Information (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Mineral Property Interests |  |  |
Interest costs incurred | $ 800 |  |
Impairment charges |  | $ 711 |
El Gallo 2 project |  |  |
Mineral Property Interests |  |  |
Total cost of deposit |  |  | $ 1,500
Refund of deposits |  |  | 1,000
Impairment charges |  | $ 700 |
El Gallo 2 project | Mine development costs |  |  |
Mineral Property Interests |  |  |
Cost of goods and services sold |  |  | $ 500

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