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STOCKHOLDERS' EQUITY: (Details) (USD $)
0 Months Ended1 Months Ended3 Months Ended6 Months Ended5 Months Ended9 Months Ended38 Months Ended9 Months Ended
Sep. 30, 2011
Aug. 22, 2011
Jun. 30, 2011
May 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Oct. 14, 2010
Dec. 31, 2008
Sep. 30, 2009
Sep. 30, 2011
Dec. 31, 2010
Sep. 30, 2010
Sep. 30, 2011
Southern Copper common shares
Sep. 30, 2010
Southern Copper common shares
Sep. 30, 2011
Southern Copper common shares
Directors' Stock Award Plan
Sep. 30, 2010
Southern Copper common shares
Directors' Stock Award Plan
Sep. 30, 2011
Employee stock purchase plan
Parent Company (Grupo Mexico) common shares
Sep. 30, 2010
Employee stock purchase plan
Parent Company (Grupo Mexico) common shares
Sep. 30, 2011
Parent Company (Grupo Mexico) common shares
Sep. 30, 2010
Parent Company (Grupo Mexico) common shares
Sep. 30, 2011
Directors' Stock Award Plan
Sep. 30, 2010
Directors' Stock Award Plan
Activity in treasury stock                      
Balance at the beginning of the period          $ 622,722,000$ 618,000,000$ 461,000,000$ 460,700,000    $ 161,700,000$ 142,700,000  
Purchase of shares28,400,00081,900,000147,500,000500,000110,300,000148,000,000500,000384,700,00071,900,000715,400,000  258,300,000400,000        
Used for corporate purposes            (500,000)(200,000)        
Other activity, including dividend, interest and currency translation effect                  3,200,00014,400,000  
Balance at the end of the period$ 883,687,000   $ 883,687,000    $ 883,687,000$ 622,722,000$ 618,000,000$ 718,800,000$ 460,900,000    $ 164,900,000$ 157,100,000  
Granted in the period (in shares)              14,400,00013,200,0007,500,00010,900,000  14,40014,400