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

9 Months Ended

Sep. 30, 2020

Inventory Disclosure [Abstract]

Schedule of Inventory

The components of inventories follow (in millions):

	September 30, 2020		December 31, 2019
Current inventories:
Total materials and supplies, neta	$	1,610	$	1,649
Mill stockpiles	$	185	$	220
Leach stockpiles	819		923
Total current mill and leach stockpiles	$	1,004	$	1,143
Raw materials (primarily concentrate)	$	360	$	318
Work-in-process	163		124
Finished goods	755		839
Total product	$	1,278	$	1,281
Long-term inventories:
Mill stockpiles	$	211	$	181
Leach stockpiles	1,252		1,244
Total long-term mill and leach stockpilesb	$	1,463	$	1,425

a.Materials and supplies inventory was net of obsolescence reserves totaling $32 million at September 30, 2020, and $24 million at December 31, 2019.

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