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STOCKHOLDERS' EQUITY: (Details) (USD $) | 1 Months Ended | 3 Months Ended | 5 Months Ended | 6 Months Ended | 7 Months Ended | 8 Months Ended | 9 Months Ended | 62 Months Ended | 1 Months Ended |  |  |  | 9 Months Ended |  |  | 9 Months Ended | 3 Months Ended
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Sep. 30, 2013 | Aug. 31, 2013 | Jul. 31, 2013 | Jun. 30, 2013 | May 31, 2013 | Apr. 30, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Sep. 30, 2012 | Dec. 31, 2008 | Oct. 14, 2010 | Oct. 31, 2012 | Dec. 31, 2011 | Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2009 | Sep. 30, 2013 | Oct. 31, 2012 Americas Mining Corporation ("AMC") merger transaction | Sep. 30, 2012 Americas Mining Corporation ("AMC") merger transaction | Sep. 30, 2013 Southern Copper common shares | Sep. 30, 2012 Southern Copper common shares | Sep. 30, 2013 Southern Copper common shares Directors' Stock Award Plan | Sep. 30, 2012 Southern Copper common shares Directors' Stock Award Plan | Sep. 30, 2013 Parent Company (Grupo Mexico) common shares | Sep. 30, 2012 Parent Company (Grupo Mexico) common shares | Sep. 30, 2013 Parent Company (Grupo Mexico) common shares Employee stock purchase plan | Sep. 30, 2012 Parent Company (Grupo Mexico) common shares Employee stock purchase plan | Sep. 30, 2013 TREASURY STOCK: Southern Copper common shares | Sep. 30, 2012 TREASURY STOCK: Southern Copper common shares | Sep. 30, 2013 TREASURY STOCK: Parent Company (Grupo Mexico) common shares | Sep. 30, 2012 TREASURY STOCK: Parent Company (Grupo Mexico) common shares | Sep. 30, 2012 ADDITIONAL PAID-IN CAPITAL: Americas Mining Corporation ("AMC") merger transaction
Activity in treasury stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at the beginning of the period |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 918,791,000 |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 729,800,000 | $ 734,100,000 | $ 189,000,000 | $ 163,700,000 |
Purchase of shares | 5,600,000 | 17,100,000 | 35,900,000 | 39,200,000 | 26,100,000 | 100,000 | 58,600,000 | 65,400,000 |  | 384,700,000 | 500,000 | 147,300,000 | 273,700,000 | 124,000,000 |  | 71,900,000 | 1,002,100,000 |  |  |  |  |  |  |  |  |  |  | 124,000,000 | 132,400,000 |  |  |
Stock dividend |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (151,400,000) |  |  |
Used for corporate purposes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (300,000) | (300,000) |  |  |
Other activity, including dividend, interest and currency translation effect |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 12,900,000 | 24,100,000 |
Balance at the end of the period | 1,055,432,000 |  |  |  |  |  | 1,055,432,000 |  | 902,600,000 |  |  |  |  | 1,055,432,000 | 902,600,000 |  | 1,055,432,000 |  |  |  |  |  |  |  |  |  |  | 853,500,000 | 714,800,000 | 201,900,000 | 187,800,000 |
Treasury stock balance at the end of the period (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 43,337,548 | 38,615,536 |  |  | 76,343,324 | 81,377,369 |  |  |  |  |  |  |
Share-based Compensation Plan, share distributions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Plan, share distributions during the period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 12,000 | 14,400 |  |  | 4,500,000 | 7,000,000 |  |  |  |  |
Delaware Court Decision Related to SCC Shareholder Derivative Lawsuit: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
SCC shareholder derivative lawsuit payment received |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,108,200,000
Legal fees related to SCC shareholders derivative lawsuit |  |  |  |  |  |  |  |  | 316,233,000 |  |  |  |  |  | 316,233,000 |  |  | 316,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accrual - Legal fees related to SCC shareholders derivative lawsuit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 316,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |

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