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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 |  |  |  |

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