PROPERTY AND EQUIPMENT (Details) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended
	Sep. 30, 2016	Jun. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
PROPERTY AND EQUIPMENT
Mine development	$ 934		$ 112	$ 2,948	$ 449
Accumulated depreciation	5,400			5,400		$ 4,700
Total	$ 14,525			$ 14,525		$ 15,759
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		$ 500