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DERIVATIVE INSTRUMENTS: (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended |
--- | --- | ---
Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2012
DERIVATIVE INSTRUMENTS: |  |  |
Minimum correlation coefficient between average monthly copper prices on LME and COMEX exchanges (as a percent) |  |  | 99.90%
Copper derivative activity related to copper sales transactions |  |  |
Realized gain (loss) on copper derivatives | $ 13.5 | $ (41.9) |
Zero cost collar contracts | 2011 |  |  |
Copper derivative activity related to copper sales transactions |  |  |
Pounds | 423,300,000 |  | 46,300,000
Average LME cap price | 3.63 |  | 5.18
Average LME floor price | 2.27 |  | 3.50
Swap contracts | 2011 |  |  |
Copper derivative activity related to copper sales transactions |  |  |
Pounds | 390,800,000 |  |
Weighted average COMEX price | 3.46 |  |
Realized gain (loss) on copper derivatives | $ 13.5 |  |

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- Definition The average cap rate on a group of price risk derivatives such as caps or collars. A payment or receipt is triggered if the market rate exceeds the cap rate on the contract. + References No definition available. + Details
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- Definition The average floor rate on a group of price risk derivatives such as floors or collars. A payment or receipt is triggered if the market rate falls below the floor rate on the contract. + References No definition available. + Details
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- Definition The aggregate net gain (loss) on price risk derivatives included in earnings in the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6935481&loc=SL5618551-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 45 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -URI http://asc.fasb.org/extlink&oid=6935481&loc=SL5624171-113959 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 25 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6886632&loc=d3e76258-113986 + Details
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