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Financial Instruments (Unaudited) Not Designated as Hedging Instruments (Details) | 6 Months Ended
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Jun. 30, 2014 lb
Embedded derivatives in provisional sales contracts - Copper [Member] | Derivatives not designated as hedging instruments [Member] |
Derivative [Line Items] |
Open positions (in lbs except gold in oz) | 496,000,000
Average contract price | 3.08
Average market price | 3.18
Maturities through | November 2014
Embedded derivatives in provisional sales contracts - Gold [Member] | Derivatives not designated as hedging instruments [Member] |
Derivative [Line Items] |
Open positions (in lbs except gold in oz) | 85,000
Average contract price | 1,273
Average market price | 1,314
Maturities through | August 2014
Embedded derivatives in provisional purchase contracts - Copper [Member] | Derivatives not designated as hedging instruments [Member] |
Derivative [Line Items] |
Open positions (in lbs except gold in oz) | 84,000,000
Average contract price | 3.07
Average market price | 3.19
Maturities through | October 2014
Atlantic Copper [Member] | Copper forward contracts [Member] | Derivatives not designated as hedging instruments [Member] |
Derivative [Line Items] |
Open positions (in lbs except gold in oz) | 19,000,000
Average contract price | 3.07
Maturities through | July 2014
Copper futures and swap contracts [Member] | Fair Value Hedging [Member] | Derivatives designated as hedging instruments [Member] |
Derivative [Line Items] |
Open positions (in lbs except gold in oz) | 53,000,000
Average contract price | 3.10
Maturities through | September 2015

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- Definition The average market price for a group of price risk forward or futures contracts, such as gas futures contracts. + References No definition available. + Details
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- Definition The month of the latest date the derivative matures. + References No definition available. + Details
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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 forward price on the group of price risk forward or futures contracts, such as gas futures contracts. + References No definition available. + Details
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- Details
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