Quarterly report pursuant to Section 13 or 15(d)

Mineral Properties - Rollforward (Details)

v3.20.1
Mineral Properties - Rollforward (Details)
$ in Thousands
 3 Months Ended
Mar. 31, 2020
USD ($)
Balance at beginning of period $ 43,212
Amortization (657)
Balance at end of period 42,555
Lost Creek Project  
Balance at beginning of period 10,184
Amortization (657)
Balance at end of period 9,527
Pathfinder properties  
Balance at beginning of period 19,850
Balance at end of period 19,850
Other U.S. Properties [Member]  
Balance at beginning of period 13,178
Balance at end of period $ 13,178