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Mineral Leaseholds, Net (Tables)
3 Months Ended
Mar. 31, 2022
Extractive Industries [Abstract]  
Mineral Leaseholds, Net of Accumulated Depletion
Mineral leaseholds, net of accumulated depletion, consisted of the following:
March 31, 2022December 31, 2021
Mineral leaseholds$1,338 $1,306 
Less: accumulated depletion(575)(559)
Mineral leaseholds, net$763 $747