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v3.21.2

Mineral Properties (Details) | 6 Months Ended
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Jun. 30, 2021 USD ($)
Balance at beginning of period | $ 39,184,000
Reclassify assets held for sale (note 4) | (2,413,000)
Depletion and amortization | (1,017,000)
Balance at end of period | 35,754,000
Lost Creek Property [Member] |
Balance at beginning of period | 6,276,000
Reclassify assets held for sale (note 4) | 0
Depletion and amortization | (1,017,000)
Balance at end of period | 5,259,000
Pathfinder Properties [Member] |
Balance at beginning of period | 19,730,000
Reclassify assets held for sale (note 4) | (2,413,000)
Depletion and amortization | 0
Balance at end of period | 17,317,000
Other U.S. Properties [Member] |
Balance at beginning of period | 13,178,000
Reclassify assets held for sale (note 4) | 0
Depletion and amortization | 0
Balance at end of period | $ 13,178,000

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- Definition Mineral properties, net of adjustments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 360 -Section 25 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=96866604&loc=d3e64895-109465 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 + Details
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