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STOCKHOLDERS'EQUITY: (Details) (USD $) | 1 Months Ended | 3 Months Ended | 5 Months Ended | 6 Months Ended | 8 Months Ended | 9 Months Ended | 47 Months Ended |  |  |  | 6 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 30, 2012 | May 31, 2012 | Apr. 30, 2012 | Jun. 30, 2012 | Dec. 31, 2008 | Oct. 14, 2010 | Dec. 31, 2011 | Sep. 30, 2009 | Jun. 30, 2012 | Jun. 30, 2011 | Jun. 30, 2012 Southern Copper common shares | Jun. 30, 2011 Southern Copper common shares | Jun. 30, 2012 Southern Copper common shares Directors' Stock Award Plan | Jun. 30, 2011 Southern Copper common shares Directors' Stock Award Plan | Jun. 30, 2012 Parent Company (Grupo Mexico) common shares Employee stock purchase plan | Jun. 30, 2011 Parent Company (Grupo Mexico) common shares Employee stock purchase plan | Jun. 30, 2012 Treasury Stock: Southern Copper common shares | Jun. 30, 2011 Treasury Stock: Southern Copper common shares | Jun. 30, 2012 Treasury Stock: Parent Company (Grupo Mexico) common shares | Jun. 30, 2011 Treasury Stock: Parent Company (Grupo Mexico) common shares
Activity in treasury stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at the beginning of the period |  |  |  |  |  |  |  |  |  | $ 784,500,000 |  |  |  |  |  |  | $ 734,100,000 | $ 461,000,000 | $ 163,700,000 | $ 161,700,000
Purchase of shares | 10,500,000 | 14,300,000 | 8,400,000 | 33,200,000 | 384,700,000 | 500,000 | 273,700,000 | 71,900,000 | 764,000,000 |  |  |  |  |  |  |  | 33,200,000 | 148,000,000 |  |
Stock dividend |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (151,400,000) |  |  |
Used for corporate purposes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (300,000) | (500,000) |  |
Other activity, including dividend, interest and currency translation effect |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 9,900,000 | 14,300,000
Balance at the end of the period | $ 789,223,000 |  |  | $ 789,223,000 |  |  | $ 897,852,000 |  | $ 789,223,000 | $ 784,500,000 |  |  |  |  |  |  | $ 615,600,000 | $ 608,500,000 | $ 173,600,000 | $ 176,000,000
Share-based Compensation Plan, share distributions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Plan, share distributions during the period |  |  |  |  |  |  |  |  |  |  |  |  | 14,400 | 14,400 | 100,000 | 3,500,000 |  |  |  |
SCC's Common Stock: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Treasury stock acquired (in share) |  |  |  |  |  |  |  |  |  |  | 35,751,686 | 39,163,606 |  |  |  |  |  |  |  |

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