INVENTORIES: (Tables)

12 Months Ended

Dec. 31, 2012

INVENTORIES:

Schedule of inventories

	As of December 31,
(in millions)	2012		2011
Inventory, current:
Metals at lower of average cost or market:
Finished goods	$	101.1	$	93.3
Work-in-process	297.4		290.3
Supplies at average cost	284.2		252.4
Total current inventory	$	682.7	$	636.0
Inventory, long-term:
Long-term leach stockpiles	$	262.8	$	128.8