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STOCKHOLDERS' EQUITY: (Details) (USD $) | 1 Months Ended | 3 Months Ended | 12 Months Ended | 68 Months Ended |  | 3 Months Ended |  |  | 3 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 21, 2014 | Jan. 31, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009 | Dec. 31, 2008 | Mar. 31, 2014 | Mar. 31, 2013 | Mar. 31, 2014 Treasury stock Southern Copper | Mar. 31, 2013 Treasury stock Southern Copper | Dec. 31, 2012 Treasury stock Southern Copper | Mar. 31, 2014 Treasury stock Parent Company (Grupo Mexico) | Mar. 31, 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 |  |  |  |  |  |  |  | $ 931,200,000 | $ 1,011,000,000 | $ 729,800,000 | $ 729,800,000 | $ 205,600,000 | $ 189,000,000
Purchase of shares | 2,900,000 | 49,600,000 | 52,500,000 | 281,400,000 | 147,300,000 | 273,700,000 | 500,000 | 71,900,000 | 384,700,000 | 1,212,000,000 |  | 52,500,000 |  |  |  |
Other activity, including dividend, interest and currency translation effect |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6,300,000 | 12,400,000
Balance at the end of the period |  |  | $ 1,275,403,000 | $ 1,216,599,000 |  |  |  |  |  | $ 1,275,403,000 | $ 931,200,000 | $ 1,063,500,000 | $ 729,800,000 | $ 729,800,000 | $ 211,900,000 | $ 201,400,000
Treasury stock balance at the end of the period (in shares) |  |  |  |  |  |  |  |  |  |  |  | 51,152,615 | 39,045,536 |  | 72,814,824 | 76,394,108

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- Definition Number of common and preferred shares that were previously issued and that were repurchased by the issuing entity and held in treasury on the financial statement date. This stock has no voting rights and receives no dividends. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.28,29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 + Details
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