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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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