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Financial Instruments (Unaudited) Not Designated as Hedging Instruments (Details)
Sep. 30, 2013
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) 555,000,000
Average contract price 3.22
Average market price 3.31
Maturities through February 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) 161,000
Average contract price 1,356
Average market price 1,332
Maturities through January 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) 52,000,000
Average contract price 3.17
Average market price 3.31
Maturities through January 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) 14,000,000
Average contract price 3.25
Maturities through November 2013
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) 41,000,000
Average contract price 3.28
Maturities through November 2014