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INVENTORIES: (Tables)

12 Months Ended

Dec. 31, 2011

INVENTORIES:

Schedule of inventories

		As of December 31,
(in millions)		2011			2010
Inventory, current:
Metals at lower of average cost or market:
Finished goods		$	93.3		$	67.9
Work-in-process		296.1			227.6
Supplies at average cost		262.5			245.5
Total current inventory		$	651.9		$	541.0
Inventory, long-term:
Long-term leach stockpiles		$	123.0		$	29.7

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- Definition

Tabular disclosure of the carrying amount as of the balance sheet date of merchandise, goods, commodities, or supplies held for future sale or to be used in manufacturing, servicing or production process.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Topic

-SubTopic

-Publisher SEC

-Number 210

-Article 5

-Subparagraph a,b,c

-Name Regulation S-X (SX)

-Paragraph 6

-Section 2

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