CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2017	Mar. 31, 2016
Revenue:
Oxide plant lease		$ 1,644	$ 1,463
Total revenue		1,644	1,463
Costs and expenses:
Oxide plant lease costs		(537)	(474)
Exploration expense		(534)	(776)
El Quevar project expense		(149)	(163)
Velardena shutdown and care and maintenance costs		(350)	(587)
Administrative expense		(1,026)	(1,218)
Stock based compensation		(65)	(32)
Reclamation expense		(49)	(51)
Other operating income, net		157	39
Depreciation and amortization		(188)	(550)
Total costs and expenses		(2,741)	(3,812)
Loss from operations		(1,097)	(2,349)
Other income and (expense):
Interest expense			(443)
Interest and other income		18	3
Warrant derivative loss		(62)	(1,180)
Derivative loss			(648)
Loss on debt extinguishment			(1,666)
Gain (loss) on foreign currency		6	(4)
Total other expense		(38)	(3,938)
Loss from operations before income taxes		(1,135)	(6,287)
Net loss		(1,135)	(6,287)
Comprehensive loss, net of tax:
Unrealized (loss) gain on securities		(52)	82
Comprehensive loss		$ (1,187)	$ (6,205)
Net loss per common share — basic
Loss (in dollars per share)		$ (0.01)	$ (0.10)
Weighted average common stock outstanding - basic (in shares)	[1]	89,350,286	65,868,598

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