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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
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