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Condensed Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Income Statement [Abstract]
Revenue, net - mineral property sale	$ 0	$ 0	$ 0	$ 408
Costs, expenses and other:
Exploration expense	112	815	269	1,680
Depreciation	6	6	19	19
General and administrative	226	319	816	1,065
Total costs, expenses and other	344	1,140	1,104	2,764
Interest income (net)	3	43	111	205
Other income	0	0	44	0
Loss on derivative instruments	(70)	(36)	(90)	(36)
Gain on sale of marketable equity securities	25	0	50	0
Unrealized gain (loss) on marketable equity securities	333	(347)	584	(736)
Total other income (loss)	291	(340)	699	(567)
Net loss	$ (53)	$ (1,480)	$ (405)	$ (2,923)
Loss per common share:
Basic and diluted	$ (0.00)	$ (0.03)	$ (0.01)	$ (0.05)
Weighted average shares outstanding:
Basic and diluted (in thousands)	58,110	58,138	58,119	58,147

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