INVENTORIES, INCLUDING LONG-TERM MILL AND LEACH STOCKPILES (Tables)

12 Months Ended

Dec. 31, 2017

Inventory Disclosure [Abstract]

Schedule of Inventory, Noncurrent

The components of inventories follow:

	December 31,
	2017		2016
Current inventories:
Total materials and supplies, neta	$	1,305	$	1,306
Mill stockpiles	$	360	$	259
Leach stockpiles	1,062		1,079
Total current mill and leach stockpiles	$	1,422	$	1,338
Raw materials (primarily concentrate)	$	265	$	255
Work-in-process	154		114
Finished goods	747		629
Total product inventories	$	1,166	$	998
Long-term inventories:
Mill stockpiles	$	300	$	487
Leach stockpiles	1,109		1,146
Total long-term inventoriesb	$	1,409	$	1,633

a. Materials and supplies inventory was net of obsolescence reserves totaling $29 million at December 31, 2017 and 2016.

b. Estimated metals in stockpiles not expected to be recovered within the next 12 months.

Components of Inventories

The components of inventories follow:

	December 31,
	2017		2016
Current inventories:
Total materials and supplies, neta	$	1,305	$	1,306
Mill stockpiles	$	360	$	259
Leach stockpiles	1,062		1,079
Total current mill and leach stockpiles	$	1,422	$	1,338
Raw materials (primarily concentrate)	$	265	$	255
Work-in-process	154		114
Finished goods	747		629
Total product inventories	$	1,166	$	998
Long-term inventories:
Mill stockpiles	$	300	$	487
Leach stockpiles	1,109		1,146
Total long-term inventoriesb	$	1,409	$	1,633

a. Materials and supplies inventory was net of obsolescence reserves totaling $29 million at December 31, 2017 and 2016.

b. Estimated metals in stockpiles not expected to be recovered within the next 12 months.