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STOCKHOLDERS' EQUITY: (Details) - USD ($)
$ in Thousands
 1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended 60 Months Ended 93 Months Ended
Sep. 30, 2015
Aug. 31, 2015
Jul. 31, 2015
Apr. 30, 2015
Mar. 31, 2015
Feb. 28, 2015
Jan. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Sep. 30, 2015
Activity in treasury stock                                
Balance at the beginning of the period             $ 1,900,686     $ 1,900,686 $ 1,900,686          
Purchase of shares $ 99,400 $ 165,700 $ 44,600 $ 44,500 $ 133,100 $ 76,300 160,700 $ 309,700 $ 44,500 370,100     $ 682,800 $ 281,400 $ 878,100 $ 2,566,600
Balance at the end of the period 2,617,827             2,617,827     $ 2,617,827 $ 1,611,500 1,900,686     2,617,827
Southern copper common shares | Directors' Stock Award Plan                                
Share Based Compensation Plan, share distributions                                
Share Based Compensation Plan, share distributions during the period                     13,200 12,000        
Parent Company (Grupo Mexico) common shares | Employee Stock Purchase Plan                                
Share Based Compensation Plan, share distributions                                
Share Based Compensation Plan, share distributions during the period                     4,300,000 900,000        
TREASURY STOCK: | Southern copper common shares                                
Activity in treasury stock                                
Balance at the beginning of the period             1,693,500     1,693,500 $ 1,693,500 $ 1,011,000 1,011,000      
Purchase of shares                     724,400 388,900        
Used for corporate purposes                     (400) (200)        
Balance at the end of the period $ 2,417,500             $ 2,417,500     $ 2,417,500 $ 1,399,700 1,693,500 1,011,000   $ 2,417,500
Treasury stock balance at the end of the period (in shares) 98,044,916             98,044,916     98,044,916 61,740,460       98,044,916
TREASURY STOCK: | Parent Company (Grupo Mexico) common shares                                
Activity in treasury stock                                
Balance at the beginning of the period             $ 207,200     $ 207,200 $ 207,200 $ 205,600 205,600      
Other activity, including dividend, interest and currency translation effect                     (6,900) 6,200        
Balance at the end of the period $ 200,300             $ 200,300     $ 200,300 $ 211,800 $ 207,200 $ 205,600   $ 200,300
Treasury stock balance at the end of the period (in shares) 92,739,076             92,739,076     92,739,076 70,760,983       92,739,076