PROPERTY AND EQUIPMENT (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
PROPERTY AND EQUIPMENT
Development costs	$ 1,316	$ 163	$ 2,014	$ 337
Accumulated depreciation	5,200		5,200		$ 4,700
Total	14,011		14,011		$ 15,759
El Gallo 2 Properties
PROPERTY AND EQUIPMENT
Total cost of deposit	$ 1,500		1,500
Refund of deposits			1,000
El Gallo 2 Properties | Mine development costs
PROPERTY AND EQUIPMENT
Development costs			$ 500