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STOCKHOLDERS' EQUITY: (Details) (USD $)
 0 Months Ended 1 Months Ended 3 Months Ended 5 Months Ended 6 Months Ended 8 Months Ended 9 Months Ended 12 Months Ended 53 Months Ended 12 Months Ended 2 Months Ended 1 Months Ended 12 Months Ended
May 31, 2012
Apr. 23, 2012
Feb. 28, 2012
Oct. 31, 2012
Sep. 30, 2012
Aug. 31, 2012
Jun. 30, 2012
Sep. 30, 2012
Dec. 31, 2008
Oct. 14, 2010
Dec. 31, 2011
Sep. 30, 2009
Dec. 31, 2012
Dec. 31, 2012
Dec. 31, 2012
TREASURY STOCK:
Grupo Mexico
Dec. 31, 2011
TREASURY STOCK:
Grupo Mexico
Dec. 31, 2012
TREASURY STOCK:
Southern Copper common shares
Dec. 31, 2011
TREASURY STOCK:
Southern Copper common shares
Dec. 31, 2012
TREASURY STOCK:
Parent Company (Grupo Mexico) common shares
Dec. 31, 2011
TREASURY STOCK:
Parent Company (Grupo Mexico) common shares
Jan. 31, 2005
Minera Mexico, S.A. de C.V. (the "Transaction")
lawsuit
Oct. 31, 2012
Americas Mining Corporation ("AMC") merger transaction
Dec. 31, 2012
Americas Mining Corporation ("AMC") merger transaction
Delaware Court Decision Related to SCC Shareholder Derivative Lawsuit:                                              
Number of purported class action derivative lawsuits filed                                         3    
Number of purported class action derivative lawsuits which are consolidated                                         3    
Number of consolidated purported class action derivative lawsuits                                         1    
Legal fees related to AMC damage award                                           $ 316,200,000  
AMC damage award               2,108,221,000                             (2,108,200,000)
Legal fees related to AMC damage award                                             316,200,000
Activity in treasury stock                                              
Balance at the beginning of the period                         897,852,000       734,100,000 461,000,000 163,700,000 161,700,000      
Purchase of shares 14,300,000 8,400,000   15,000,000 95,900,000 3,200,000 10,500,000   384,700,000 500,000 273,700,000 71,900,000 147,300,000 878,100,000     147,300,000 273,600,000          
Stock dividend distribution                                 (151,400,000)            
Used for corporate purposes                                 (200,000) (500,000)          
Other activity, including dividend, interest and currency translation effect                                     25,300,000 2,000,000      
Balance at the end of the period                     $ 897,852,000   $ 918,791,000 $ 918,791,000     $ 729,800,000 $ 734,100,000 $ 189,000,000 $ 163,700,000      
Treasury stock balance at the end of the period (in shares)                             80,674,702 84,606,069 39,045,536 43,616,086          
Stock dividend paid (in shares)     9,000,000