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STOCKHOLDERS' EQUITY: (Details) (USD $)
 3 Months Ended 0 Months Ended 3 Months Ended 3 Months Ended
Mar. 31, 2013
Dec. 31, 2012
Mar. 31, 2012
Mar. 31, 2013
Southern Copper common shares
Mar. 31, 2012
Southern Copper common shares
Mar. 31, 2013
Parent Company (Grupo Mexico) common shares
Mar. 31, 2012
Parent Company (Grupo Mexico) common shares
Mar. 31, 2012
TREASURY STOCK:
Feb. 28, 2012
TREASURY STOCK:
Southern Copper common shares
Mar. 31, 2012
TREASURY STOCK:
Southern Copper common shares
Mar. 31, 2013
TREASURY STOCK:
Southern Copper common shares
Dec. 31, 2012
TREASURY STOCK:
Southern Copper common shares
Mar. 31, 2013
TREASURY STOCK:
Parent Company (Grupo Mexico) common shares
Mar. 31, 2012
TREASURY STOCK:
Parent Company (Grupo Mexico) common shares
Activity in treasury stock                            
Balance at the beginning of the period $ 931,224,000 $ 918,791,000 $ 760,100,000             $ 734,100,000 $ 729,800,000 $ 729,800,000 $ 189,000,000 $ 163,700,000
Stock dividend               (151,458,000)   (151,400,000)        
Other activity, including dividend, interest and currency translation effect                         12,400,000 13,700,000
Balance at the end of the period $ 931,224,000 $ 918,791,000 $ 760,100,000             $ 582,700,000 $ 729,800,000 $ 729,800,000 $ 201,400,000 $ 177,400,000
Treasury stock balance at the end of the period (in shares)       39,045,536 34,617,600 76,394,108 83,717,588              
Stock dividend paid (in shares)                 0.0107