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DERIVATIVE INSTRUMENTS: (Details) (USD $) In Millions, unless otherwise specified |  | 3 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2012 | Mar. 31, 2011 Zero cost collar and swap contracts | Mar. 31, 2012 Zero cost collar contracts 1st Quarter 2012 priceperunit lbs | Mar. 31, 2011 Zero cost collar contracts 1st Quarter 2011 priceperunit lbs | Mar. 31, 2011 Swap contracts 1st Quarter 2011 lbs priceperunit
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 |  |  | 46,300,000 | 105,800,000 | 119,600,000
Average LME cap price |  |  | 5.18 | 4.84 |
Average LME floor price |  |  | 3.50 | 3.02 |
Weighted average COMEX price |  |  |  |  | 4.08
Realized loss on copper derivatives |  | $ (35.8) |  |  |

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