FINANCIAL INSTRUMENTS (Derivative) (Details)	Dec. 31, 2012 lb
Embedded derivatives in provisional sales contracts, Copper [Member] | Derivatives Not Designated as Hedging Instruments [Member]
Derivative [Line Items]
Derivative held (in lbs except gold in oz)	541,000,000
Average contract price	3.57
Average market price	3.59
Embedded derivatives in provisional sales contracts, Gold [Member] | Derivatives Not Designated as Hedging Instruments [Member]
Derivative [Line Items]
Derivative held (in lbs except gold in oz)	104,000
Average contract price	1,703
Average market price	1,666
Embedded derivatives in provisional purchase contracts, Copper [Member] | Derivatives Not Designated as Hedging Instruments [Member]
Derivative [Line Items]
Derivative held (in lbs except gold in oz)	203,000,000
Average contract price	3.61
Average market price	3.59
Atlantic Copper [Member] | Copper Forward Contracts [Member] | Derivatives Not Designated as Hedging Instruments [Member]
Derivative [Line Items]
Derivative held (in lbs except gold in oz)	13,000,000
Average contract price	3.62
Maximum [Member] | Embedded derivatives in provisional sales contracts, Copper [Member] | Derivatives Not Designated as Hedging Instruments [Member]
Derivative [Line Items]
Maturities	May 2013
Maximum [Member] | Embedded derivatives in provisional sales contracts, Gold [Member] | Derivatives Not Designated as Hedging Instruments [Member]
Derivative [Line Items]
Maturities	April 2013
Maximum [Member] | Embedded derivatives in provisional purchase contracts, Copper [Member] | Derivatives Not Designated as Hedging Instruments [Member]
Derivative [Line Items]
Maturities	March 2013
Maximum [Member] | Atlantic Copper [Member] | Copper Forward Contracts [Member] | Derivatives Not Designated as Hedging Instruments [Member]
Derivative [Line Items]
Maturities	February 2013
Fair Value Hedging [Member] | Commodity Contract [Member] | Derivatives Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative held (in lbs except gold in oz)	52,000,000
Average contract price	3.57
Fair Value Hedging [Member] | Maximum [Member] | Commodity Contract [Member] | Derivatives Designated as Hedging Instrument [Member]
Derivative [Line Items]
Maturities	January 2014