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DERIVATIVE INSTRUMENTS: (Details) (Zero cost collar contracts, 2011, USD $) In Millions, unless otherwise specified | 3 Months Ended
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Mar. 31, 2013 lb
Zero cost collar contracts | 2011 |
Copper derivative activity related to copper sales transactions |
Pounds | 46,300,000
Average cap price (in dollars per unit) | 5.18
Average floor price (in dollars per unit) | 3.50
Realized gain (loss) on copper derivatives | $ 0

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- Definition Aggregate notional amount of derivative expressed in nonmonetary units. For example, the number of barrels specified in a fuel oil forward purchase contract. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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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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