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DISCONTINUED OPERATIONS - Business segments included in discontinued operations (Details) - Uranium And Lithium Operations - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2020
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Mineral property expenses	$ (570)	$ (1,172)
General and administrative expenses	(433)	(850)
Accretion of asset retirement obligations	(32)	(138)
Depreciation and amortization	(15)	(26)
Other income (expense)	19	30
Net Loss from Discontinued Operations	$ (1,031)	$ (2,156)

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