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STOCKHOLDERS' EQUITY: (Details) (USD $)
 1 Months Ended 3 Months Ended 5 Months Ended 6 Months Ended 9 Months Ended 35 Months Ended 6 Months Ended
Jun. 30, 2011
May 31, 2011
Jun. 30, 2011
Dec. 31, 2008
Oct. 31, 2010
Sep. 30, 2009
Jun. 30, 2011
Dec. 31, 2010
Jun. 30, 2010
Jun. 30, 2011
Southern Copper common shares
Jun. 30, 2010
Southern Copper common shares
Jun. 30, 2011
Employee stock purchase plan
Parent Company (Grupo Mexico) common shares
Jun. 30, 2010
Employee stock purchase plan
Parent Company (Grupo Mexico) common shares
Jun. 30, 2011
Parent Company (Grupo Mexico) common shares
Jun. 30, 2010
Parent Company (Grupo Mexico) common shares
Activity in treasury stock                              
Balance at the beginning of the period               $ 622,722,000 $ 613,300,000 $ 461,000,000 $ 460,700,000     $ 161,700,000 $ 142,700,000
Purchase of shares 147,500,000 500,000 148,000,000 384,700,000 500,000 71,900,000 605,100,000     148,000,000 400,000        
Used for corporate purposes                   (500,000) (200,000)        
Other activity, including dividend, interest and currency translation effect                           14,300,000 9,700,000
Balance at the end of the period $ 784,481,000   $ 784,481,000       $ 784,481,000 $ 622,722,000 $ 613,300,000 $ 608,500,000 $ 460,900,000     $ 176,000,000 $ 152,400,000
Granted in the period (in shares)                       3,500,000 600,000