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STOCKHOLDERS' EQUITY: (Tables) | 3 Months Ended
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Mar. 31, 2016
STOCKHOLDERS' EQUITY: |
Schedule of activity in treasury stock | Activity in treasury stock in the three-month period ended March 31, 2016 and 2015 is as follows (in millions):
|  | 2016 |  | 2015 |
Southern Copper common shares |  |  |  |  |
Balance as of January 1, |  | $ | 2,697.6 |  | $ | 1,693.5 |
Purchase of shares |  | 53.7 |  | 370.1 |
Balance as of March 31, |  | 2,751.3 |  | 2,063.6 |
Parent Company (Grupo Mexico) common shares |  |  |  |  |
Balance as of January 1, |  | 211.3 |  | 207.2 |
Other activity, including dividend, interest and foreign currency transaction effect |  | 3.7 |  | (2.9 | )
Balance as of March 31, |  | 215.0 |  | 204.3 |
Treasury stock balance as of March 31, |  | $ | 2,966.3 |  | $ | 2,267.9 |
Schedule of share repurchase program activity |
Period |  | Total Number of Shares |  | Average Price Paid per |  | Total Number of Shares Purchased as Part of Publicly |  | Maximum Number of Shares that May Yet Be Purchased Under the Plan |  | Total Cost |
From |  | To |  | Purchased |  | Share |  | Announced Plan |  | @ $27.71 (*) |  | ($ in millions) |
2008 |  | 2012 |  | 46,914,486 |  | $ | 18.72 |  | 46,914,486 |  |  |  | $ | 878.1 |
2013 |  |  |  | 10,245,000 |  | 27.47 |  | 57,159,486 |  |  |  | 281.4 |
2014 |  |  |  | 22,711,428 |  | 30.06 |  | 79,870,914 |  |  |  | 682.8 |
2015 |  |  |  | 36,689,052 |  | 27.38 |  | 116,559,966 |  |  |  | 1,004.4 |
2016 |  |  |  |  |  |  |  |  |  |  |  |  |
01/01/16 |  | 01/31/16 |  | 2,235,200 |  | 24.05 |  | 118,795,166 |  |  |  | 53.7 |
Total first quarter |  |  |  | 2,235,200 |  | 24.05 |  |  |  |  |  | 53.7 |
Total purchased |  |  |  | 118,795,166 |  | $ | 24.41 |  |  |  | 3,595,217 |  | $ | 2,900.4 |
(*) NYSE closing price of SCC common shares at March 31, 2016.
Summary of non-controlling interest activity |
|  | 2016 |  | 2015 |
Balance as of January 1, |  | $ | 36.3 |  | $ | 32.1 |
Net earnings |  | 0.6 |  | 1.3 |
Dividend paid |  | — |  | (0.2 | )
Balance as of March 31, |  | $ | 36.9 |  | $ | 33.2 |
Employee Stock Purchase 2007 Plan |
STOCKHOLDERS' EQUITY: |
Schedule of stock award activity |
|  | Shares |  | Unit Weighted Average Grant Date Fair Value |
Outstanding shares at January 1, 2016 |  | 109,241 |  | $ | 1.16 |
Granted |  | — |  | — |
Exercised |  | — |  | — |
Forfeited |  | — |  | — |
Outstanding shares at March 31, 2016 |  | 109,241 |  | $ | 1.16 |
Outstanding shares at January 1, 2015 |  | 4,298,612 |  | $ | 1.16 |
Granted |  | — |  | — |
Exercised |  | (3,660,945 | ) | $ | 1.16 |
Forfeited |  | — |  | — |
Outstanding shares at March 31, 2015 |  | 637,667 |  | $ | 1.16 |
Employee Stock Purchase 2010 Plan |
STOCKHOLDERS' EQUITY: |
Schedule of stock based compensation expense and unrecognized compensation expense | The stock based compensation expense for the first quarter 2016 and 2015 and the unrecognized compensation expense under this plan were as follows (in millions):
|  | 2016 |  | 2015 |
Stock based compensation expense |  | $ | 0.1 |  | $ | 0.1 |
Unrecognized compensation expense |  | $ | 1.3 |  | $ | 2.0 |
Schedule of stock award activity |
|  | Shares |  | Unit Weighted Average Grant Date Fair Value |
Outstanding shares at January 1, 2016 |  | 2,227,582 |  | $ | 2.05 |
Granted |  | — |  | — |
Exercised |  | (338,989 | ) | 2.05 |
Forfeited |  | — |  | — |
Outstanding shares at March 31, 2016 |  | 1,888,593 |  | $ | 2.05 |
Outstanding shares at January 1, 2015 |  | 2,287,891 |  | $ | 2.05 |
Granted |  | — |  | — |
Exercised |  | — |  | — |
Forfeited |  | — |  | — |
Outstanding shares at March 31, 2015 |  | 2,287,891 |  | $ | 2.05 |
Employee Stock Purchase 2015 Plan |
STOCKHOLDERS' EQUITY: |
Schedule of stock based compensation expense and unrecognized compensation expense | The stock based compensation expense for the first quarter 2016 and 2015 and the unrecognized compensation expense under this plan were as follows (in millions):
|  | 2016 |  | 2015 |
Stock based compensation expense |  | $ | 0.2 |  | — |
Unrecognized compensation expense |  | $ | 4.2 |  | — |
Schedule of stock award activity |
|  | Shares |  | Unit Weighted Average Grant Date Fair Value |
Outstanding shares at January 1, 2016 |  | 2,652,386 |  | $ | 2.63 |
Granted |  | — |  | — |
Exercised |  | — |  | — |
Forfeited |  | — |  | — |
Outstanding shares at March 31, 2016 |  | 2,652,386 |  | $ | 2.63 |
Outstanding shares at January 1, 2015 |  | — |  | — |
Granted |  | 2,652,386 |  | $ | 2.63 |
Exercised |  | — |  | — |
Forfeited |  | — |  | — |
Outstanding shares at March 31, 2015 |  | 2,652,386 |  | $ | 2.63 |

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