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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 50 Months Ended 9 Months Ended 9 Months Ended
Oct. 31, 2012
Sep. 30, 2012
Aug. 31, 2012
Jun. 30, 2012
May 31, 2012
Apr. 30, 2012
Sep. 30, 2012
Jun. 30, 2012
Dec. 31, 2008
Oct. 14, 2010
Dec. 31, 2011
Sep. 30, 2009
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Southern Copper common shares
Sep. 30, 2011
Southern Copper common shares
Sep. 30, 2012
Southern Copper common shares
Directors' Stock Award Plan
Sep. 30, 2011
Southern Copper common shares
Directors' Stock Award Plan
Sep. 30, 2012
Parent Company (Grupo Mexico) common shares
Employee stock purchase plan
Sep. 30, 2011
Parent Company (Grupo Mexico) common shares
Employee stock purchase plan
Sep. 30, 2012
Treasury Stock:
Grupo Mexico
Sep. 30, 2011
Treasury Stock:
Grupo Mexico
Sep. 30, 2012
Treasury Stock:
Southern Copper common shares
Sep. 30, 2011
Treasury Stock:
Southern Copper common shares
Sep. 30, 2012
Treasury Stock:
Parent Company (Grupo Mexico) common shares
Sep. 30, 2011
Treasury Stock:
Parent Company (Grupo Mexico) common shares
Activity in treasury stock                                                    
Balance at the beginning of the period $ 902,612,000                         $ 883,700,000                 $ 734,100,000 $ 461,000,000 $ 163,700,000 $ 161,700,000
Purchase of shares   95,900,000 3,200,000 10,500,000 14,300,000 8,400,000 99,100,000 33,200,000 384,700,000 500,000 273,700,000 71,900,000 863,100,000                   132,400,000 258,300,000    
Stock dividend                                             (151,400,000)      
Used for corporate purposes                                             (300,000) (500,000)    
Other activity, including dividend, interest and currency translation effect                                                 24,100,000 3,200,000
Balance at the end of the period   902,612,000         902,612,000       897,852,000   902,612,000 883,700,000                 714,800,000 718,800,000 187,800,000 164,900,000
Share-based Compensation Plan, share distributions                                                    
Share-based Compensation Plan, share distributions during the period                                 14,400 14,400 7,000,000 7,500,000            
Additional paid-in Capital                                                    
Amount received in satisfaction of judgment $ 2,108,200,000                                                  
SCC's Common Stock:                                                    
Treasury stock acquired (in share)                             38,615,536 42,996,086         81,377,369 84,806,533