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Mineral Leaseholds, Net (Tables) | 3 Months Ended
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Mar. 31, 2017
Mineral Leaseholds, Net [Abstract] |
Summary of Mineral Leaseholds, Net of Accumulated Depletion | Mineral leaseholds, net of accumulated depletion, consisted of the following:
|  | March 31, 2017 |  |  | December 31, 2016 |
Mineral leaseholds |  | $ | 2,005 |  |  | $ | 1,996 |
Less accumulated depletion |  |  | (399 | ) |  |  | (389 | )
Mineral leaseholds, net |  | $ | 1,606 |  |  | $ | 1,607 |

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- References No definition available. + Details
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