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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 USD ($) $ / ounce | Dec. 31, 2017 USD ($)
Disclosure of detailed information about property, plant and equipment [line items] |  |
Write down of fixed assets | $ 2,771 | $ 1,719
Computer equipment | Minimum |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Useful life of property, plant and equipment | 3 years |
Computer equipment | Maximum |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Useful life of property, plant and equipment | 7 years |
Furniture and fixtures |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Useful life of property, plant and equipment | 7 years |
Vehicles | Minimum |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Useful life of property, plant and equipment | 2 years |
Vehicles | Maximum |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Useful life of property, plant and equipment | 5 years |
Mining equipment | Minimum |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Useful life of property, plant and equipment | 5 years |
Mining equipment | Maximum |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Useful life of property, plant and equipment | 10 years |
Mobile equipment components | Minimum |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Useful life of property, plant and equipment | 2 years |
Mobile equipment components | Maximum |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Useful life of property, plant and equipment | 9 years |
Pitarrilla Project | Silver |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Write down of fixed assets | $ 64,000 |
Discounted cash flow, price per ounce (usd per oz) | $ / ounce | 17.75 |
Weighted average cost of capital, significant unobservable inputs, assets | 8.50% |
Percentage of increase (decrease) in value of currency | (3.00%) |
Discount rate used in current measurement of expected future proceeds from sale of assets | 9.00% |

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