CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Revenue:
Sale of metals (Note 14)	$ 2,337
Costs and expenses:
Costs applicable to sale of metals (exclusive of depreciation shown below) (Note 14)	(3,012)
Exploration expense	(969)	(1,600)
El Quevar project expense	(406)	(334)
Velardena project expense	(119)
Velardena shutdown and care & maintenance costs		(1,249)
Administrative expense	(1,328)	(1,655)
Stock based compensation	(179)	(330)
Reclamation and accretion expense	(110)	(49)
Other operating income, net	176	2
Depreciation, depletion and amortization	(1,359)	(846)
Total costs and expenses	(7,306)	(6,061)
Loss from operations	(4,969)	(6,061)
Other income and (expense):
Interest and other income (Note 15)	916	394
Warrant derivative gain (Note 16)	650
(Loss) gain on foreign currency	(28)	9
Total other income	1,538	403
Loss from operations before income taxes	(3,431)	(5,658)
Income tax benefit	0	0
Net loss	(3,431)	(5,658)
Comprehensive loss:
Unrealized loss on securities	(80)
Comprehensive loss	$ (3,511)	$ (5,658)
Net loss per common share - basic
Loss (in dollars per share)	$ (0.07)	$ (0.13)
Weighted average common stock outstanding - basic (in shares)	52,686,250	42,893,617