CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Revenue:
Oxide plant lease		$ 1,900	$ 1,771	$ 5,267	$ 5,107
Total revenue		1,900	1,771	5,267	5,107
Costs and expenses:
Oxide plant lease costs		(657)	(619)	(1,685)	(1,704)
Exploration expense		(1,077)	(977)	(3,017)	(1,968)
El Quevar project expense		(364)	(183)	(917)	(524)
Velardena shutdown and care and maintenance costs		(428)	(379)	(1,409)	(1,098)
Administrative expense		(673)	(694)	(2,556)	(2,592)
Stock based compensation		139	7	(111)	(300)
Reclamation expense		(53)	(49)	(156)	(146)
Other operating income, net		3,188	951	4,638	1,813
Depreciation and amortization		(337)	(138)	(897)	(456)
Total costs and expenses		(262)	(2,081)	(6,110)	(6,975)
Income (loss) from operations		1,638	(310)	(843)	(1,868)
Other income and (expense):
Interest and other (expense) income, net		(59)	15	54	37
Gain (loss) on foreign currency		6	(23)	(50)	(20)
Total other income		(53)	(8)	4	17
Income (loss) from operations before income taxes		1,585	(318)	(839)	(1,851)
Net income (loss)		1,585	(318)	(839)	(1,851)
Comprehensive income (loss), net of tax:
Unrealized gain (loss) on securities			11		(92)
Comprehensive income (loss), net of tax:		$ 1,585	$ (307)	$ (839)	$ (1,943)
Net income (loss) per common share - basic
Loss (in dollars per share)		$ 0.02	$ 0.00	$ (0.01)	$ (0.02)
Weighted average common stock outstanding - basic (in shares)	[1]	95,271,194	91,097,279	93,572,608	90,028,480

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