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STOCKHOLDERS' EQUITY: (Details) (USD $)
 1 Months Ended 3 Months Ended 12 Months Ended 74 Months Ended 9 Months Ended
Sep. 30, 2014
Aug. 31, 2014
Jul. 31, 2014
Jun. 30, 2014
Mar. 21, 2014
Jan. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Dec. 31, 2008
Sep. 30, 2014
Sep. 30, 2014
Southern Copper
Directors' Stock Award Plan
Sep. 30, 2013
Southern Copper
Directors' Stock Award Plan
Sep. 30, 2014
Parent Company (Grupo Mexico)
Employee stock purchase plan
Sep. 30, 2013
Parent Company (Grupo Mexico)
Employee stock purchase plan
Sep. 30, 2014
Treasury stock
Southern Copper
Sep. 30, 2013
Treasury stock
Southern Copper
Sep. 30, 2014
Treasury stock
Parent Company (Grupo Mexico)
Sep. 30, 2013
Treasury stock
Parent Company (Grupo Mexico)
Activity in treasury stock                                                
Balance at the beginning of the period           $ 1,216,599,000     $ 1,216,599,000                       $ 1,011,000,000 $ 729,800,000 $ 205,600,000 $ 189,000,000
Purchase of shares 141,400,000 158,100,000 23,900,000 13,000,000 2,900,000 49,600,000 323,400,000 13,000,000 52,500,000 281,400,000 147,300,000 273,700,000 500,000 71,900,000 384,700,000 1,548,400,000         388,900,000 124,000,000    
Used for corporate purposes                                         (200,000) (300,000)    
Other activity, including dividend, interest and currency translation effect                                             6,200,000 12,900,000
Balance at the end of the period $ 1,611,495,000           $ 1,611,495,000     $ 1,216,599,000           $ 1,611,495,000         $ 1,399,700,000 $ 853,500,000 $ 211,800,000 $ 201,900,000
Treasury stock balance at the end of the period (in shares)                                         61,740,460 43,337,548 70,760,983 76,343,324
Share Based Compensation Plan, share distributions                                                
Share Based Compensation Plan, share distributions during the period                                 12,000 12,000 900,000 2,500,000