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

12 Months Ended

Dec. 31, 2018

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,
	2018			2017
Proven and probable mineral reserves	$	7,089		$	3,974
VBPP	477			536
Mine development and other	8,195			6,213
Buildings and infrastructure	8,051			7,553
Machinery and equipment	12,985			12,330
Mobile equipment	4,010			3,766
Construction in progress	3,006			2,971
Oil and gas properties	27,292			27,453
Total	71,105			64,796
Accumulated depreciation, depletion, and amortizationa	(43,095		)	(41,802		)
Property, plant, equipment and mine development costs, net	$	28,010		$	22,994