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FINANCING: (Details) (USD $) |  |  | 12 Months Ended |  |  | 1 Months Ended |  |  | 1 Months Ended | 12 Months Ended |  | 12 Months Ended |  | 1 Months Ended |  |  | 1 Months Ended |  |  |  |  | 12 Months Ended |  |  | 1 Months Ended |  |  | 1 Months Ended |
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Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2011 2.02% Mitsui credit agreement due 2013 t | Dec. 31, 2010 2.02% Mitsui credit agreement due 2013 | Dec. 31, 2011 2.02% Mitsui credit agreement due 2013 Minimum | Jan. 31, 2006 6.375% Notes due 2015 | Jul. 31, 2005 6.375% Notes due 2015 | Dec. 31, 2011 6.375% Notes due 2015 | Dec. 31, 2010 6.375% Notes due 2015 | Apr. 30, 2010 Fixed-rate senior unsecured notes issued April 2010 Tranche | Dec. 31, 2011 Fixed-rate senior unsecured notes issued April 2010 | Apr. 16, 2010 Fixed-rate senior unsecured notes issued April 2010 | Dec. 31, 2011 Fixed-rate senior unsecured notes issued April 2010 Minimum Agency gradation | Jul. 31, 2005 Fixed-rate senior unsecured notes issued July 2005 | Apr. 30, 2010 5.375% Notes due 2020 | Dec. 31, 2011 5.375% Notes due 2020 | Dec. 31, 2010 5.375% Notes due 2020 | Apr. 30, 2010 6.75% Notes due 2040 | Dec. 31, 2011 6.75% Notes due 2040 | Dec. 31, 2010 6.75% Notes due 2040 | Dec. 31, 2011 9.25% Yankee bonds Series B due 2028 | Dec. 31, 2010 9.25% Yankee bonds Series B due 2028 | Dec. 31, 2011 9.25% Yankee bonds Series B due 2028 Minera Mexico Minimum denominator numerator | Dec. 31, 2011 7.50% Notes due 2035 | Dec. 31, 2010 7.50% Notes due 2035 | May 31, 2006 7.50% Notes issued May 2006 and due 2035 | Dec. 31, 2011 7.50% Notes issued May 2006 and due 2035 | May 09, 2006 7.50% Notes issued May 2006 and due 2035 | Jan. 31, 2006 7.50% Notes issued July 2005 and due 2035 | Jul. 31, 2005 7.50% Notes issued July 2005 and due 2035 | Dec. 31, 2011 7.50% Notes issued July 2005 and due 2035
FINANCING |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total debt | $ 2,745,700,000 | $ 2,760,400,000 | $ 20,000,000 | $ 30,000,000 |  |  |  | $ 199,400,000 | $ 199,300,000 |  |  |  |  |  |  | $ 398,100,000 | $ 398,000,000 |  | $ 1,092,000,000 | $ 1,091,900,000 | $ 51,100,000 | $ 56,400,000 |  | $ 985,100,000 | $ 984,800,000 |  |  |  |  |  |
Less, current portion | (10,000,000) | (10,000,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total long-term debt | 2,735,732,000 | 2,750,401,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Effective interest rate at the end of the period (as a percent) |  |  |  | 1.71% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Base rate |  |  | Japanese LIBO |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on yield reference rate at issuance (as a percent) |  |  | 1.25% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.40% |  | 3.15% |
Interest rate (as a percent) |  |  | 2.02% |  |  |  |  | 6.375% |  |  |  |  |  |  |  | 5.375% |  |  | 6.75% |  | 9.25% |  |  | 7.50% |  |  | 7.50% |  |  |  | 7.50%
Face amount of debt |  |  |  |  |  |  |  | 200,000,000 | 200,000,000 |  |  |  |  |  |  | 400,000,000 | 400,000,000 |  | 1,100,000,000 | 1,100,000,000 |  |  |  | 1,000,000,000 | 1,000,000,000 |  |  |  |  |  |
Debt discount | 25,400,000 |  |  |  |  |  | 1,100,000 | 600,000 | 700,000 |  |  | 10,300,000 |  |  |  | 1,900,000 | 2,000,000 |  | 8,000,000 | 8,100,000 |  |  |  | 14,900,000 | 15,200,000 |  |  | 10,800,000 |  | 5,300,000 |
Ratio of EBITDA to interest expense, numerator |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.5 |  |  |  |  |  |  |  |
Ratio of EBITDA to interest expense, denominator |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.0 |  |  |  |  |  |  |  |
Volume of copper on pledged receivables (in tonnes) |  |  | 31,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' equity amount required to be maintained |  |  |  |  | 750,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt issuance amount |  |  |  |  |  |  | 200,000,000 |  |  | 1,500,000,000 |  |  |  |  | 400,000,000 |  |  | 1,100,000,000 |  |  |  |  |  |  |  | 400,000,000 |  |  |  | 600,000,000 |
Deferred cost associated with issuance of debt, included in other assets | 18,800,000 | 19,300,000 |  |  |  |  |  |  |  |  |  | 8,200,000 |  | 8,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,200,000 |  |  |
Amount of debt tendered in exchange offer |  |  |  |  |  | $ 197,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 590,500,000 |  |
Yield reference rate at issuance |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 30-Year U.S. Treasury bond |  |  |  | 30-Year U.S. Treasury bond |
Number of tranches in which debt instruments are issued |  |  |  |  |  |  |  |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of principal amount at which notes may be required to be repurchased in event of change of control in the entity |  |  |  |  |  |  |  |  |  |  | 101.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of rating agencies that could cause a change of control triggering event |  |  |  |  |  |  |  |  |  |  |  |  | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of decreased gradations that could cause a change of control triggering event |  |  |  |  |  |  |  |  |  |  |  |  | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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