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STOCKHOLDERS'EQUITY: (Details) (USD $)
 1 Months Ended 3 Months Ended 5 Months Ended 6 Months Ended 8 Months Ended 9 Months Ended 47 Months Ended 6 Months Ended
Jun. 30, 2012
May 31, 2012
Apr. 30, 2012
Jun. 30, 2012
Dec. 31, 2008
Oct. 14, 2010
Dec. 31, 2011
Sep. 30, 2009
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Southern Copper common shares
Jun. 30, 2011
Southern Copper common shares
Jun. 30, 2012
Southern Copper common shares
Directors' Stock Award Plan
Jun. 30, 2011
Southern Copper common shares
Directors' Stock Award Plan
Jun. 30, 2012
Parent Company (Grupo Mexico) common shares
Employee stock purchase plan
Jun. 30, 2011
Parent Company (Grupo Mexico) common shares
Employee stock purchase plan
Jun. 30, 2012
Treasury Stock:
Southern Copper common shares
Jun. 30, 2011
Treasury Stock:
Southern Copper common shares
Jun. 30, 2012
Treasury Stock:
Parent Company (Grupo Mexico) common shares
Jun. 30, 2011
Treasury Stock:
Parent Company (Grupo Mexico) common shares
Activity in treasury stock                                        
Balance at the beginning of the period                   $ 784,500,000             $ 734,100,000 $ 461,000,000 $ 163,700,000 $ 161,700,000
Purchase of shares 10,500,000 14,300,000 8,400,000 33,200,000 384,700,000 500,000 273,700,000 71,900,000 764,000,000               33,200,000 148,000,000    
Stock dividend                                 (151,400,000)      
Used for corporate purposes                                 (300,000) (500,000)    
Other activity, including dividend, interest and currency translation effect                                     9,900,000 14,300,000
Balance at the end of the period $ 789,223,000     $ 789,223,000     $ 897,852,000   $ 789,223,000 $ 784,500,000             $ 615,600,000 $ 608,500,000 $ 173,600,000 $ 176,000,000
Share-based Compensation Plan, share distributions                                        
Share-based Compensation Plan, share distributions during the period                         14,400 14,400 100,000 3,500,000        
SCC's Common Stock:                                        
Treasury stock acquired (in share)                     35,751,686 39,163,606