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Condensed Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Income Statement [Abstract]
Revenue, net - mineral property sale	$ 0	$ 0	$ 408	$ 502
Costs, expenses and other:
Exploration expense	815	344	1,680	686
Depreciation	6	7	19	19
General and administrative	319	344	1,065	1,509
Total costs, expenses and other	1,140	695	2,764	2,214
Interest income, net	43	46	205	109
Unrealized loss on marketable equity securities	(347)	(74)	(736)	(737)
Loss on derivative instruments	(36)	0	(36)	0
Total other loss	(340)	(28)	(567)	(628)
Net loss	$ (1,480)	$ (723)	$ (2,923)	$ (2,340)
Loss per common share:
Basic and diluted	$ (0.03)	$ (0.01)	$ (0.05)	$ (0.04)
Weighted average shares outstanding:
Basic and diluted	58,138	58,303	58,147	58,379

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