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DISCONTINUED OPERATIONS - Business segments included in discontinued operations - (Details) - Uranium And Lithium Operations - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Mineral property expenses | $ (752) | $ (820) | $ (1,924) | $ (2,181)
Discontinued Operations, Held-for-sale or Disposed of by Sale [Member] |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
General and administrative expenses | (405) | (356) | (1,273) | (1,181)
Accretion of asset retirement obligations | (32) | (197) | (170) | (353)
Depreciation and amortization | (30) | (20) | (36) | (66)
Other income (expense) | (30) |  | (30) |
Net Loss from Discontinued Operations | (6,389) | (664) | (8,573) | (3,052)
Discontinued Operations, Held-for-sale [Member] |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Impairment of uranium properties | $ (5,200) |  | $ (5,200) |
Gain on disposal of uranium assets |  | $ 729 |  | $ 729

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