Assets Held for Sale (Details) - USD ($) |
6 Months Ended | 12 Months Ended |
|---|---|---|
Jun. 30, 2021 |
Dec. 31, 2020 |
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| Assets held for sale | ||
| Mineral properties | $ 2,413,000 | $ 0 |
| Liabilities associated with assets held for sale | ||
| Asset retirement obligations | 875,000 | 0 |
| Net assets held for sale | $ 1,538,000 | $ 0 |
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- Definition Amount of asset retirement obligations settled, or otherwise disposed of, during the period. This may include asset retirement obligations transferred to third parties associated with the sale of a long-lived asset. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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