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Mineral Leaseholds, Net (Tables) | 3 Months Ended
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Mar. 31, 2021
Extractive Industries [Abstract] |
Mineral Leaseholds, Net of Accumulated Depletion | Mineral leaseholds, net of accumulated depletion, consisted of the following:
| March 31, 2021 |  | December 31, 2020
Mineral leaseholds | $ | 1,335 |  |  | $ | 1,333 |
Less: accumulated depletion | (540) |  |  | (530) |
Mineral leaseholds, net | $ | 795 |  |  | $ | 803 |

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- Definition Tabular disclosure of mineral leaseholds. + References No definition available. + Details
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