CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Revenue:
Oxide plant lease	$ 1,196	$ 1,932
Total revenue	1,196	1,932
Costs and expenses:
Oxide plant lease costs	(564)	(597)
Exploration expense	(1,631)	(855)
El Quevar project expense	(248)	(315)
Velardeña care and maintenance costs	(463)	(517)
Administrative expense	(1,163)	(1,074)
Stock based compensation	(52)	(564)
Reclamation expense	(59)	(59)
Other operating income, net	4	108
Depreciation and amortization	(279)	(274)
Total costs and expenses	(4,455)	(4,147)
Income (loss) from operations	(3,259)	(2,215)
Other income and (expense):
Interest and other income (expense), net	(27)	(98)
Loss on foreign currency	(50)	(38)
Total other income (loss)	(77)	(136)
Income (loss) from operations before income taxes	(3,336)	(2,351)
Net income (loss)	$ (3,336)	$ (2,351)
Net income (loss) per common share - basic
Loss (in dollars per share)	$ (0.03)	$ (0.02)
Weighted average Common Stock outstanding - basic (in shares)	107,247,298	95,755,304