Mineral Leaseholds, Net (Tables)

6 Months Ended

Jun. 30, 2021

Extractive Industries [Abstract]

Mineral Leaseholds, Net of Accumulated Depletion

Mineral leaseholds, net of accumulated depletion, consisted of the following:

	June 30, 2021		December 31, 2020
Mineral leaseholds	$	1,347	$	1,333
Less: accumulated depletion	(552)		(530)
Mineral leaseholds, net	$	795	$	803