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Financial Instruments (Unaudited) Not Designated as Hedging Instruments (Details) oz in Thousands, lb in Millions | 9 Months Ended
--- | ---
Sep. 30, 2015 lb oz $ / lb $ / oz
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) | lb | 536
Average contract price | 2.45
Average market price | 2.34
Maturities through | Mar. 31, 2016
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) | oz | 149
Average contract price | $ / oz | 1,125
Average market price | $ / oz | 1,118
Maturities through | Dec. 31, 2015
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) | lb | 87
Average contract price | 2.45
Average market price | 2.35
Maturities through | Jan. 31, 2016
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) | lb | 4
Average contract price | 2.31
Maturities through | Nov. 30, 2015
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) | lb | 59
Average contract price | 2.46
Maturities through | Sep. 30, 2017

X
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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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