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STOCKHOLDERS' EQUITY: (Details) (USD $)
 3 Months Ended 1 Months Ended 3 Months Ended 3 Months Ended 3 Months Ended
Mar. 31, 2012
Feb. 28, 2012
TREASURY STOCK:
Mar. 31, 2012
TREASURY STOCK:
Mar. 31, 2011
TREASURY STOCK:
Mar. 31, 2012
Southern Copper common shares.
TREASURY STOCK:
Mar. 31, 2011
Southern Copper common shares.
TREASURY STOCK:
Dec. 31, 2010
Southern Copper common shares.
TREASURY STOCK:
Mar. 31, 2012
Parent Company (Grupo Mexico) common shares.
TREASURY STOCK:
Mar. 31, 2011
Parent Company (Grupo Mexico) common shares.
TREASURY STOCK:
Activity in treasury stock                  
Balance at the beginning of the period $ 897,852,000     $ 630,600,000 $ 734,100,000 $ 461,000,000 $ 461,000,000 $ 163,700,000 $ 161,700,000
Stock dividend     (151,458,000)   (151,400,000)        
Other activity, including dividend, interest and currency translation effect               13,700,000 7,900,000
Balance at the end of the period $ 760,088,000   $ 760,100,000 $ 630,600,000 $ 582,700,000 $ 461,000,000 $ 461,000,000 $ 177,400,000 $ 169,600,000
Stock dividend paid (in shares) 9,000,000 0.0107 0.0107