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STOCKHOLDERS' EQUITY: (Tables) | 3 Months Ended
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Mar. 31, 2018
STOCKHOLDERS' EQUITY: |
Schedule of activity in treasury stock | Activity in treasury stock in the three-month period ended March 31, 2018 and 2017 is as follows (in millions):
|  | 2018 |  | 2017 |
Southern Copper common shares |  |  |  |  |
Balance as of January 1, |  | $ | 2,768.7 |  | $ | 2,769.0 |
Purchase of shares |  | — |  | — |
Balance as of March 31, |  | 2,768.7 |  | 2,769.0 |
Parent Company (Grupo Mexico) common shares |  |  |  |  |
Balance as of January 1, |  | 232.4 |  | 218.6 |
Other activity, including dividend, interest and foreign currency transaction effect |  | 6.5 |  | 2.1 |
Balance as of March 31, |  | 238.9 |  | 220.7 |
Treasury stock balance as of March 31, |  | $ | 3,007.6 |  | $ | 2,989.7 |
Schedule of share repurchase program activity |
Period |  | Total Number of Shares |  | Average Price Paid |  | Total Number of Shares Purchased as Part of Publicly |  | Maximum Number of Shares that May Yet Be Purchased Under the Plan |  | Total Cost ($ in |
From |  | To |  | Purchased |  | per Share |  | Announced Plan |  | @ $54.18(1) |  | 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: |  |  |  | 2,937,801 |  | 24.42 |  |  |  |  |  | 71.7 |
Total purchased |  |  |  | 119,497,767 |  | $ | 24.42 |  |  |  | 1,506,706 |  | $ | 2,918.4 |
(*) NYSE closing price of SCC common shares at March 31, 2018.
Summary of non-controlling interest activity |
|  | 2018 |  | 2017 |
Balance as of January 1, |  | $ | 41.7 |  | $ | 38.6 |
Net earnings |  | 1.2 |  | 0.9 |
Dividend paid |  | (0.3 | ) | (0.2 | )
Balance as of March 31, |  | $ | 42.6 |  | $ | 39.3 |
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 2018 and 2017 and the unrecognized compensation expense under this plan were as follows (in millions):
|  | 2018 |  | 2017 |
Stock based compensation expense |  | $ | 0.1 |  | $ | 0.1 |
Unrecognized compensation expense |  | $ | 0.1 |  | $ | 0.7 |
Schedule of stock award activity |
|  | Shares |  | Unit Weighted Average Grant Date Fair Value |
Outstanding shares at January 1, 2018 |  | 1,393,663 |  | $ | 2.05 |
Granted |  | — |  | — |
Exercised |  | (981,707 | ) | 2.05 |
Forfeited |  | — |  | — |
Outstanding shares at March 31, 2018 |  | 411,956 |  | $ | 2.05 |
Outstanding shares at January 1, 2017 |  | 1,401,096 |  | $ | 2.05 |
Granted |  | — |  | — |
Exercised |  | — |  | 2.05 |
Forfeited |  | — |  | — |
Outstanding shares at March 31, 2017 |  | 1,401,096 |  | $ | 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 2018 and 2017 and the unrecognized compensation expense under this plan were as follows (in millions):
|  | 2018 |  | 2017 |
Stock based compensation expense |  | $ | 0.2 |  | $ | 0.2 |
Unrecognized compensation expense |  | $ | 3.0 |  | $ | 3.4 |
Schedule of stock award activity |
|  | Shares |  | Unit Weighted Average Grant Date Fair Value |
Outstanding shares at January 1, 2018 |  | 2,293,120 |  | $ | 2.63 |
Granted |  | — |  | — |
Exercised |  | (1,873 | ) | 2.63 |
Forfeited |  | — |  | — |
Outstanding shares at March 31, 2018 |  | 2,291,247 |  | $ | 2.63 |
Outstanding shares at January 1, 2017 |  | 2,540,223 |  | $ | 2.63 |
Granted |  | — |  | — |
Exercised |  | (228,430 | ) | 2.63 |
Forfeited |  | — |  | — |
Outstanding shares at March 31, 2017 |  | 2,311,793 |  | $ | 2.63 |

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