CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2016	Mar. 31, 2015
Revenue:
Oxide plant lease		$ 1,463
Sale of metals			$ 2,337
Total revenues		1,463	2,337
Costs and expenses:
Oxide plant lease costs		(474)
Costs of metal sold (exclusive of depreciation shown below)			(3,012)
Exploration expense		(776)	(969)
El Quevar project expense		(163)	(406)
Velardena project expense			(119)
Velardena shutdown and care and maintenance costs		(587)
Administrative expense		(1,218)	(1,328)
Stock based compensation		(32)	(179)
Reclamation and accretion expense		(51)	(110)
Other operating income, net		39	176
Depreciation, depletion and amortization		(550)	(1,359)
Total costs and expenses		(3,812)	(7,306)
Loss from operations		(2,349)	(4,969)
Other income and (expense):
Interest expense		(443)
Interest and other income		3	916
Warrant derivative (loss) gain		(1,180)	650
Derivative loss		(648)
Loss on debt extinguishment		(1,666)
Loss on foreign currency		(4)	(28)
Total other expense (income)		(3,938)	1,538
Loss from operations before income taxes		(6,287)	(3,431)
Income tax benefit		0
Net loss		(6,287)	(3,431)
Other comprehensive loss, net of tax:
Unrealized gain (loss) on securities	[1]	82	(80)
Comprehensive loss		$ (6,205)	$ (3,511)
Net loss per common share — basic
Loss (in dollars per share)		$ (0.09)	$ (0.07)
Weighted average common stock outstanding - basic (in shares)	[1]	65,868,598	52,686,250

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