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STOCKHOLDERS' EQUITY: (Details) (USD $)
 1 Months Ended 3 Months Ended 12 Months Ended 71 Months Ended 6 Months Ended
Jun. 30, 2014
Mar. 21, 2014
Jan. 31, 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
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Southern Copper
Directors' Stock Award Plan
Jun. 30, 2013
Southern Copper
Directors' Stock Award Plan
Jun. 30, 2014
Parent Company (Grupo Mexico)
Employee stock purchase plan
Jun. 30, 2013
Parent Company (Grupo Mexico)
Employee stock purchase plan
Jun. 30, 2014
Treasury stock
Southern Copper
Jun. 30, 2013
Treasury stock
Southern Copper
Jun. 30, 2014
Treasury stock
Parent Company (Grupo Mexico)
Jun. 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               $ 994,000,000         $ 1,011,000,000 $ 729,800,000 $ 205,600,000 $ 189,000,000
Purchase of shares 13,000,000 2,900,000 49,600,000 13,000,000 52,500,000 281,400,000 147,300,000 273,700,000 500,000 71,900,000 384,700,000 1,225,000,000           65,500,000 64,500,000    
Used for corporate purposes                                   (300,000) (200,000)    
Other activity, including dividend, interest and currency translation effect                                       8,800,000 10,900,000
Balance at the end of the period $ 1,290,684,000     $ 1,290,684,000   $ 1,216,599,000           $ 1,290,684,000 $ 994,000,000         $ 1,076,200,000 $ 794,100,000 $ 214,400,000 $ 199,900,000
Treasury stock balance at the end of the period (in shares)                                   51,591,147 41,192,136 72,078,019 77,832,273
Share Based Compensation Plan, share distributions                                          
Share Based Compensation Plan, share distributions during the period                           12,000 12,000 700,000 2,400,000