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DISCONTINUED OPERATIONS - Cash flow information (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]    
Depreciation and amortization $ 15 $ 26
Capital Expenditures   (87)
Accretion of asset retirement obligations $ 32 $ 138