Quarterly report pursuant to Section 13 or 15(d)

Mineral Properties (Details)

v3.20.2
Mineral Properties (Details)
$ in Thousands
 9 Months Ended
Sep. 30, 2020
USD ($)
Balance at beginning of period $ 43,212
Change in estimated reclamation costs (170)
Amortization (1,850)
Balance at end of period 41,192
Other U.S. Properties [Member]  
Balance at beginning of period 13,178
Change in estimated reclamation costs 0
Amortization 0
Balance at end of period 13,178
Pathfinder Properties [Member]  
Balance at beginning of period 19,850
Change in estimated reclamation costs (170)
Amortization 0
Balance at end of period 19,680
Lost Creek Property [Member]  
Balance at beginning of period 10,184
Change in estimated reclamation costs 0
Amortization (1,850)
Balance at end of period $ 8,334