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Mineral Leaseholds, Net (Tables)
 6 Months Ended
Jun. 30, 2020
Extractive Industries [Abstract]  
Mineral Leaseholds, Net of Accumulated Depletion
Mineral leaseholds, net of accumulated depletion, consisted of the following:
June 30,
2020		December 31,
2019
Mineral leaseholds$1,301  $1,352  
Less: accumulated depletion(523) (500) 
Mineral leaseholds, net$778  $852