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Financial Instruments (Unaudited) Not Designated as Hedging Instruments (Details) - Jun. 30, 2015 oz in Thousands, lb in Millions | lb oz $ / lb $ / oz
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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 | 572
Average contract price | 2.68
Average market price | 2.58
Maturities through | Nov. 30, 2015
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 | 229
Average contract price | $ / oz | 1,189
Average market price | $ / oz | 1,174
Maturities through | Sep. 30, 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 | 134
Average contract price | 2.75
Average market price | 2.61
Maturities through | Oct. 31, 2015
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 | 31
Average contract price | 2.65
Maturities through | Aug. 31, 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 | 51
Average contract price | 2.71
Maturities through | May 31, 2017

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