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PROPERTY AND EQUIPMENT - By Type (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
PROPERTY AND EQUIPMENT |  |  |
Subtotal | $ 20,016 | $ 20,482 |
Less: accumulated depreciation | (5,764) | (4,723) |
Total | 14,252 | 15,759 |
Mine development costs | 3,866 | 1,169 | $ 1,829
El Gallo 2 Properties |  |  |
PROPERTY AND EQUIPMENT |  |  |
Total cost of deposit | 1,500 |  |
Refund of deposits | 1,000 |  |
El Gallo 2 Properties | Mine development costs |  |  |
PROPERTY AND EQUIPMENT |  |  |
Mine development costs | 500 |  |
Trucks and trailers |  |  |
PROPERTY AND EQUIPMENT |  |  |
Subtotal | 1,233 | 1,065 |
Office furniture and equipment |  |  |
PROPERTY AND EQUIPMENT |  |  |
Subtotal | 1,891 | 1,543 |
Leasehold Improvements |  |  |
PROPERTY AND EQUIPMENT |  |  |
Subtotal | 661 | 661 |
Drill rigs |  |  |
PROPERTY AND EQUIPMENT |  |  |
Subtotal | 1,198 | 1,061 |
Building |  |  |
PROPERTY AND EQUIPMENT |  |  |
Subtotal | 1,514 | 1,514 |
Land |  |  |
PROPERTY AND EQUIPMENT |  |  |
Subtotal | 8,699 | 8,699 |
Mining equipment |  |  |
PROPERTY AND EQUIPMENT |  |  |
Subtotal | 2,008 | 1,625 |
Construction in process |  |  |
PROPERTY AND EQUIPMENT |  |  |
Subtotal | $ 2,812 | $ 4,314 |

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