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DERIVATIVE INSTRUMENTS: (Details) (USD $) | 12 Months Ended |  | 12 Months Ended |  |  | 12 Months Ended
--- | --- | --- | --- | --- | --- | ---
Dec. 31, 2011 mmbtu | Dec. 31, 2010 | Dec. 31, 2011 Zero cost collar and swap contracts | Dec. 31, 2010 Zero cost collar contracts | Dec. 31, 2011 Zero cost collar contracts 2011 lbs priceperunit | Dec. 31, 2011 Zero cost collar contracts 1st Quarter 2012 priceperunit lbs | Dec. 31, 2011 Swap contracts 2011 lbs priceperunit | Dec. 31, 2010 Swap contracts 2011 lbs priceperunit | Dec. 31, 2009 Exchange rate derivatives, U.S. Dollar/ Mexican peso contracts
DERIVATIVE INSTRUMENTS: |  |  |  |  |  |  |  |  |
Minimum correlation coefficient between average monthly copper prices on LME and COMEX exchanges (as a percent) | 99.90% |  |  |  |  |  |  |  |
Copper derivative activity related to copper sales transactions |  |  |  |  |  |  |  |  |
Pound |  |  |  |  | 423,300,000 | 46,300,000 | 390,800,000 | 276,700,000 |
Average LME cap price |  |  |  |  | 3.63 | 5.18 |  |  |
Average LME floor price |  |  |  |  | 2.27 | 3.50 |  |  |
Weighted average COMEX price |  |  |  |  |  |  | 3.46 | 3.79 |
Realized gain (loss) on copper derivatives | $ 13,500,000 | $ (41,900,000) | $ 13,500,000 | $ (41,900,000) |  |  |  |  |
Estimated percentage of copper sales covered |  |  |  |  |  | 13.60% |  |  |
Unrealized gain recognized in other comprehensive income net of income taxes | 131,014,000 | (125,562,000) |  |  |  | 3,500,000 |  |  |
Accumulated unrealized loss recognized in other comprehensive income, income tax | (3,500,000) | 71,400,000 |  |  |  | 5,400,000 |  |  |
Estimated unrealized loss to be reclassified from accumulated other comprehensive loss into earnings within next twelve months | 5,400,000 |  |  |  |  |  |  |  |
Gas consumption protected through gas swap contracts (in MMBTUs) | 306,000 |  |  |  |  |  |  |  |
Fixed price for gas swap contracts | $ 3.6350 |  |  |  |  |  |  |  |
Gain on derivative instruments |  |  |  |  |  |  |  |  | $ 4,200,000

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