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INVENTORIES: (Tables) | 3 Months Ended
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Mar. 31, 2012
INVENTORIES: |
Schedule of inventories |
(in millions) |  | March 31, 2012 |  | December 31, 2011 |
Inventory, current: |  |  |  |  |
Metals at lower of average cost or market: |  |  |  |  |
Finished goods |  | $ | 76.5 |  | $ | 93.3 |
Work-in-process |  | 258.5 |  | 296.1 |
Supplies at average cost |  | 274.1 |  | 262.5 |
Total current inventory |  | $ | 609.1 |  | $ | 651.9 |
Inventory, long-term: |  |  |  |  |
Leach stockpiles |  | $ | 154.0 |  | $ | 123.0 |

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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 + Details
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