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DERIVATIVE INSTRUMENTS: (Tables)

12 Months Ended

Dec. 31, 2011

DERIVATIVE INSTRUMENTS:

Copper derivative activity related to copper sales transactions

		2011			2010
Zero cost collar contracts:
Pounds (in millions)		423.3			—
Average LME cap price		$	3.63		—
Average LME floor price		$	2.27		—
Swap contracts:
Pounds (in millions)		390.8			276.7
Weighted average COMEX price		$	3.46		$	3.79
Realized gain (loss) on copper derivatives		$	13.5		$	(41.9	)

Copper derivative contracts

		1st Quarter 2012
Zero cost collar contracts:
Pounds (in millions)		46.3
Average LME cap price		$	5.18
Average LME floor price		$	3.50
Estimated % of copper sales covered		13.6		%
Unrealized gain recognized in other comprehensive income (net of income taxes of $3.5 million) (in millions)		$	5.4

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Tabular disclosure of the location and amount of gains and losses reported in the statement of financial performance, or when applicable, the statement of financial position. For example, (a) gains and losses recognized in the income statement on derivative instruments designated and qualifying as hedging instruments in fair value hedges and related hedged items designated and qualifying in fair value hedges and (b) gains and losses initially recognized in other comprehensive income on derivative instruments designated and qualifying as cash flow hedges.

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Tabular disclosure of pertinent information about a derivative or group of derivatives on a disaggregated basis, such as for individual instruments, or small groups of similar instruments. May include a combination of the type of instrument, risks being hedged, notional amount, hedge designation, related hedged item, inception date, maturity date, or other relevant item.

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