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v3.3.1.900

STOCKHOLDERS' EQUITY: (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 12 Months Ended | 60 Months Ended | 96 Months Ended
--- | --- | --- | --- | --- | ---
Dec. 31, 2015 | Nov. 30, 2015 | Oct. 31, 2015 | Sep. 30, 2015 | Aug. 31, 2015 | Jul. 31, 2015 | Apr. 30, 2015 | Mar. 31, 2015 | Feb. 28, 2015 | Jan. 31, 2015 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2015
Activity in treasury stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at the beginning of the period |  |  |  |  |  |  |  |  |  | $ 1,900.6 |  |  |  | $ 1,900.6 | $ 1,900.6 |  |  |  |
Purchase of shares | $ 114.0 | $ 123.2 | $ 42.8 | $ 99.4 | $ 165.7 | $ 44.7 | $ 44.5 | $ 133.1 | $ 76.3 | 160.7 | $ 280.0 | $ 309.8 | $ 44.5 | 370.1 | 1,004.4 | $ 682.8 | $ 281.4 | $ 878.1 | $ 2,846.6
Balance at the end of the period | $ 2,908.9 |  |  |  |  |  |  |  |  |  | $ 2,908.9 |  |  |  | $ 2,908.9 | $ 1,900.6 |  |  | $ 2,908.9
Southern copper common shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Activity in treasury stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Treasury stock balance at the end of the period (in shares) | 108,653,816 |  |  |  |  |  |  |  |  |  | 108,653,816 |  |  |  | 108,653,816 | 71,977,964 |  |  | 108,653,816
Parent Company (Grupo Mexico) common shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Activity in treasury stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Treasury stock balance at the end of the period (in shares) | 110,472,170 |  |  |  |  |  |  |  |  |  | 110,472,170 |  |  |  | 110,472,170 | 89,950,310 |  |  | 110,472,170
TREASURY STOCK: | Southern copper common shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Activity in treasury stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at the beginning of the period |  |  |  |  |  |  |  |  |  | 1,693.5 |  |  |  | 1,693.5 | $ 1,693.5 | $ 1,011.0 |  |  |
Purchase of shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,004.4 | 682.7 |  |  |
Used for corporate purposes |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (0.3) | (0.2) |  |  |
Balance at the end of the period | $ 2,697.6 |  |  |  |  |  |  |  |  |  | $ 2,697.6 |  |  |  | 2,697.6 | 1,693.5 | 1,011.0 |  | $ 2,697.6
TREASURY STOCK: | Parent Company (Grupo Mexico) common shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Activity in treasury stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at the beginning of the period |  |  |  |  |  |  |  |  |  | $ 207.1 |  |  |  | $ 207.1 | 207.1 | 205.5 |  |  |
Other activity, including dividend, interest and foreign currency transaction effect |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4.2 | 1.6 |  |  |
Balance at the end of the period | $ 211.3 |  |  |  |  |  |  |  |  |  | $ 211.3 |  |  |  | $ 211.3 | $ 207.1 | $ 205.5 |  | $ 211.3

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