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STOCKHOLDERS' EQUITY: (Details) (USD $) |  |  |  |  |  |  |  | 3 Months Ended | 0 Months Ended | 3 Months Ended |  |  | 3 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 31, 2013 | Dec. 31, 2012 | Mar. 31, 2012 | Mar. 31, 2013 Southern Copper common shares | Mar. 31, 2012 Southern Copper common shares | Mar. 31, 2013 Parent Company (Grupo Mexico) common shares | Mar. 31, 2012 Parent Company (Grupo Mexico) common shares | Mar. 31, 2012 TREASURY STOCK: | Feb. 28, 2012 TREASURY STOCK: Southern Copper common shares | Mar. 31, 2012 TREASURY STOCK: Southern Copper common shares | Mar. 31, 2013 TREASURY STOCK: Southern Copper common shares | Dec. 31, 2012 TREASURY STOCK: Southern Copper common shares | Mar. 31, 2013 TREASURY STOCK: Parent Company (Grupo Mexico) common shares | Mar. 31, 2012 TREASURY STOCK: Parent Company (Grupo Mexico) common shares
Activity in treasury stock |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at the beginning of the period | $ 931,224,000 | $ 918,791,000 | $ 760,100,000 |  |  |  |  |  |  | $ 734,100,000 | $ 729,800,000 | $ 729,800,000 | $ 189,000,000 | $ 163,700,000
Stock dividend |  |  |  |  |  |  |  | (151,458,000) |  | (151,400,000) |  |  |  |
Other activity, including dividend, interest and currency translation effect |  |  |  |  |  |  |  |  |  |  |  |  | 12,400,000 | 13,700,000
Balance at the end of the period | $ 931,224,000 | $ 918,791,000 | $ 760,100,000 |  |  |  |  |  |  | $ 582,700,000 | $ 729,800,000 | $ 729,800,000 | $ 201,400,000 | $ 177,400,000
Treasury stock balance at the end of the period (in shares) |  |  |  | 39,045,536 | 34,617,600 | 76,394,108 | 83,717,588 |  |  |  |  |  |  |
Stock dividend paid (in shares) |  |  |  |  |  |  |  |  | 0.0107 |  |  |  |  |

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- Definition Number of shares of common stock issued as dividends during the period. Excludes stock splits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 + Details
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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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- Definition The amount allocated to treasury stock. Treasury stock is common and preferred shares of an entity that were issued, repurchased by the entity, and are held in its treasury. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6405834&loc=d3e23315-112656 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Technical Bulletin (FTB) -Number 85-6 -Paragraph 3 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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