CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Revenue:
Oxide plant lease		$ 1,729		$ 4,768
Sale of metals			$ 1,788		$ 6,086
Total revenue		1,729	1,788	4,768	6,086
Costs and expenses:
Oxide plant lease costs		(549)		(1,478)
Cost of metals sold (exclusive of depreciation shown below)			(2,598)		(8,385)
Exploration expense		(927)	(615)	(2,865)	(2,851)
El Quevar project expense (income)		65	(177)	(308)	(988)
Velardena project expense					(119)
Velardena shutdown and care and maintenance costs		(456)	(393)	(1,589)	(393)
Administrative expense		(897)	(1,047)	(3,141)	(3,375)
Stock based compensation		(95)	(99)	(666)	(372)
Reclamation expense		(47)	(48)	(144)	(206)
Impairment of long lived assets			(13,181)		(13,181)
Other operating income, net		1,281	7	1,558	477
Depreciation, depletion and amortization		(346)	(1,209)	(1,317)	(3,743)
Total costs and expenses		(1,971)	(19,360)	(9,950)	(33,136)
Loss from operations		(242)	(17,572)	(5,182)	(27,050)
Other income and (expense):
Interest expense				(515)
Interest and other income		10	623	12	2,006
Warrant derivative (loss) gain		(545)	200	(2,821)	1,068
Derivative loss				(778)
Loss on debt extinguishment				(1,653)
Loss on foreign currency		(21)	(71)	(63)	(125)
Total other expense (income)		(556)	752	(5,818)	2,949
Loss from operations before income taxes		(798)	(16,820)	(11,000)	(24,101)
Income tax benefit				26
Net loss		(798)	(16,820)	(10,974)	(24,101)
Comprehensive loss, net of tax:
Unrealized gain (loss) on securities		107	(88)	278	(125)
Comprehensive loss		$ (691)	$ (16,908)	$ (10,696)	$ (24,226)
Net loss per common share — basic
Loss (in dollars per share)		$ (0.01)	$ (0.32)	$ (0.14)	$ (0.46)
Weighted average common stock outstanding - basic (in shares)	[1]	88,878,371	52,960,212	78,080,858	52,921,542

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