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PROPERTY, PLANT, EQUIPMENT AND MINING DEVELOPMENT COSTS, NET (Tables)
 12 Months Ended
Dec. 31, 2017
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,
 
2017
 
2016
Proven and probable mineral reserves
$
3,974

 
$
3,863

VBPP
447

 
559

Mine development and other
6,212

 
5,755

Buildings and infrastructure
7,520

 
7,479

Machinery and equipment
12,201

 
11,744

Mobile equipment
3,764

 
3,725

Construction in progress
2,964

 
2,831

Property, plant, equipment and mine development costs
37,082

 
35,956

Accumulated depreciation, depletion and amortization
(14,246
)
 
(12,737
)
Property, plant, equipment and mine development costs, net
$
22,836

 
$
23,219