INVENTORIES: (Tables)

12 Months Ended

Dec. 31, 2013

INVENTORIES:

Schedule of inventories

	As of December 31,
(in millions)	2013		2012
Inventory, current:
Metals at lower of average cost or market:
Finished goods	$	84.2	$	101.1
Work-in-process	305.4		310.8
Supplies at average cost	304.3		284.2
Total current inventory	$	693.9	$	696.1
Inventory, long-term:
Long-term leach stockpiles	$	395.2	$	249.4