Inventories, Including Long-Term Mill and Leach Stockpiles (Unaudited) (Tables)

6 Months Ended

Jun. 30, 2016

Inventories, Including Long Term Mill and Leach Stockpiles [Abstract]

Schedule of Inventory [Table Text Block]

The components of inventories follow (in millions):

	June 30, 2016		December 31, 2015
Current inventories:
Mill stockpiles	$	146	$	137
Leach stockpiles	1,202		1,402
Total current mill and leach stockpiles	$	1,348	$	1,539
Total materials and supplies, neta	$	1,338	$	1,594
Raw materials (primarily concentrate)	$	222	$	220
Work-in-process	93		108
Finished goods	743		743
Total product inventories	$	1,058	$	1,071
Long-term inventories:
Mill stockpiles	$	584	$	480
Leach stockpiles	1,158		1,183
Total long-term mill and leach stockpilesb	$	1,742	$	1,663

a. Materials and supplies inventory was net of obsolescence reserves totaling $29 million at June 30, 2016, and $26 million at December 31, 2015.

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