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PROVISIONALLY PRICED SALES: (Details) (USD $)	Sep. 30, 2011 lbs
Copper
Provisionally priced sales
Nonmonetary notional amount of commodity (in million lbs.)	70,600,000
Provisional price	$ 3.18
Copper | October 2011
Provisionally priced sales
Nonmonetary notional amount of commodity (in million lbs.)	54,200,000
Provisional price	3.18
Copper | November 2011
Provisionally priced sales
Nonmonetary notional amount of commodity (in million lbs.)	16,400,000
Provisional price	3.18
Molybdenum
Provisionally priced sales
Nonmonetary notional amount of commodity (in million lbs.)	9,900,000
Provisional price	14.40
Molybdenum | October 2011
Provisionally priced sales
Nonmonetary notional amount of commodity (in million lbs.)	3,200,000
Provisional price	14.40
Molybdenum | November 2011
Provisionally priced sales
Nonmonetary notional amount of commodity (in million lbs.)	3,400,000
Provisional price	14.40
Molybdenum | December 2011
Provisionally priced sales
Nonmonetary notional amount of commodity (in million lbs.)	2,600,000
Provisional price	14.40
Molybdenum | January 2012
Provisionally priced sales
Nonmonetary notional amount of commodity (in million lbs.)	700,000
Provisional price	$ 14.40

X

- Definition

Aggregate notional amount of provisionally priced sales agreements with notional amounts expressed in nonmonetary units.

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- Definition

The per unit price of provisionally priced sales agreements.

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