PROPERTY, PLANT, EQUIPMENT AND MINING DEVELOPMENT COSTS, NET (Tables)

12 Months Ended

Dec. 31, 2021

Property, Plant and Equipment, Net [Abstract]

Property, Plant, Equipment and Mining Development Costs, Net

The components of net property, plant, equipment and mine development costs follow:

	December 31,
	2021		2020
Proven and probable mineral reserves	$	7,142	$	7,142
VBPP	376		376
Mine development and other	11,309		10,686
Buildings and infrastructure	9,412		9,214
Machinery and equipment	14,399		14,235
Mobile equipment	4,605		4,495
Construction in progress	2,477		1,454
Oil and gas properties	27,298		27,281
Total	77,018		74,883
Accumulated depreciation, depletion and amortizationa	(46,673)		(45,065)
Property, plant, equipment and mine development costs, net	$	30,345	$	29,818