| Mineral Property |
|
|
Lost Creek |
|
|
Pathfinder |
|
|
Other U.S. |
|
|
|
|
Mineral Properties |
|
Property |
|
|
Mines |
|
|
Properties |
|
|
Total |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
December 31, 2017 |
|
|
11,810 |
|
|
|
19,701 |
|
|
|
13,166 |
|
|
|
44,677 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Acquisition costs |
|
|
- |
|
|
|
- |
|
|
|
31 |
|
|
|
31 |
|
Change in estimated reclamation costs |
|
|
2,577 |
|
|
|
263 |
|
|
|
- |
|
|
|
2,840 |
|
Depletion and amortization |
|
|
(1,743 |
) |
|
|
- |
|
|
|
- |
|
|
|
(1,743 |
) |
December 31, 2018 |
|
|
12,644 |
|
|
|
19,964 |
|
|
|
13,197 |
|
|
|
45,805 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Acquisition costs |
|
|
- |
|
|
|
- |
|
|
|
8 |
|
|
|
8 |
|
Change in estimated reclamation costs |
|
|
125 |
|
|
|
(114 |
) |
|
|
- |
|
|
|
11 |
|
Property write-offs |
|
|
16 |
|
|
|
- |
|
|
|
(27 |
) |
|
|
(11 |
) |
Depletion and amortization |
|
|
(2,601 |
) |
|
|
- |
|
|
|
- |
|
|
|
(2,601 |
) |
December 31, 2019 |
|
|
10,184 |
|
|
|
19,850 |
|
|
|
13,178 |
|
|
|
43,212 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Change in estimated reclamation costs |
|
|
(1,463 |
) |
|
|
(120 |
) |
|
|
- |
|
|
|
1,583 |
) |
Depletion and amortization |
|
|
(2,445 |
) |
|
|
- |
|
|
|
- |
|
|
|
(2,445 |
) |
December 31, 2020 |
|
|
6,276 |
|
|
|
19,730 |
|
|
|
13,178 |
|
|
|
39,184 |
|
|