Annual report pursuant to Section 13 and 15(d)

Mineral Properties (Details)

v3.22.0.1
Mineral Properties (Details) - USD ($)
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Balance at beginning of period $ 39,184,000 $ 43,212,000 $ 45,805,000
Acquisition costs     8,000
Change in estimated reclamation costs (536,000) (1,583,000) 11,000
Reclassify assets held for sale (note 4) (1,536,000)    
Property write-offs     (11,000)
Depletion and amortization 2,045,000 2,445,000 2,601,000
Balance at end of period 35,067,000 39,184,000 43,212,000
Lost Creek Property [Member]      
Balance at beginning of period 6,276,000 10,184,000 12,644,000
Acquisition costs     0
Change in estimated reclamation costs 296,000 (1,463,000) 125,000
Reclassify assets held for sale (note 4) 0    
Property write-offs     (16,000)
Depletion and amortization 2,045,000 2,445,000 2,601,000
Balance at end of period 4,527,000 6,276,000 10,184,000
Pathfinder Properties [Member]      
Balance at beginning of period 19,730,000 19,850,000 19,964,000
Acquisition costs     0
Change in estimated reclamation costs (832,000) (120,000) (114,000)
Reclassify assets held for sale (note 4) (1,536,000)    
Property write-offs     0
Depletion and amortization 0 0 0
Balance at end of period 17,362,000 19,730,000 19,850,000
Other U.S. Properties [Member]      
Balance at beginning of period 13,178,000 13,178,000 13,197,000
Acquisition costs     8,000
Change in estimated reclamation costs 0 0 0
Reclassify assets held for sale (note 4) 0    
Property write-offs     (27,000)
Depletion and amortization 0 0 0
Balance at end of period $ 13,178,000 $ 13,178,000 $ 13,178,000