CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Revenue:
Oxide plant lease		$ 1,692	$ 1,576	$ 3,336	$ 3,039
Total revenue		1,692	1,576	3,336	3,039
Costs and expenses:
Oxide plant lease costs		(548)	(455)	(1,085)	(929)
Exploration expense		(457)	(1,162)	(991)	(1,938)
El Quevar project expense		(192)	(210)	(341)	(373)
Velardena shutdown and care and maintenance costs		(369)	(546)	(719)	(1,133)
Administrative expense		(872)	(1,026)	(1,898)	(2,244)
Stock based compensation		(242)	(539)	(307)	(571)
Reclamation expense		(48)	(46)	(97)	(97)
Other operating income, net		705	205	862	244
Depreciation and amortization		(130)	(421)	(318)	(971)
Total costs and expenses		(2,153)	(4,200)	(4,894)	(8,012)
Loss from operations		(461)	(2,624)	(1,558)	(4,973)
Other income and (expense):
Interest expense			(72)		(515)
Interest and other income		4	32	22	35
Warrant derivative gain (loss)		425	(1,096)	363	(2,276)
Derivative loss			(130)		(778)
Gain (loss) on debt extinguishment			13		(1,653)
(Loss) gain on foreign currency		(3)	(38)	3	(42)
Total other expense		426	(1,291)	388	(5,229)
Loss from operations before income taxes		(35)	(3,915)	(1,170)	(10,202)
Income tax benefit			26		26
Net loss		(35)	(3,889)	(1,170)	(10,176)
Comprehensive loss, net of tax:
Unrealized (loss) gain on securities		(51)	89	(103)	171
Comprehensive loss		$ (86)	$ (3,800)	$ (1,273)	$ (10,005)
Net loss per common share — basic
Loss (in dollars per share)		$ 0.00	$ (0.05)	$ (0.01)	$ (0.14)
Weighted average common stock outstanding - basic (in shares)	[1]	89,618,677	82,817,778	89,485,223	74,343,257

[1] Potentially dilutive shares have not been included because to do so would be anti-dilutive.