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STOCKHOLDERS' EQUITY: (Tables) | 3 Months Ended
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Mar. 31, 2019
STOCKHOLDERS' EQUITY: |
Schedule of activity in treasury stock | Activity in treasury stock in the three-month period ended March 31, 2019 and 2018 is as follows (in millions):
|  | 2019 |  | 2018
Southern Copper common shares |  |  |  |  |  |
Balance as of January 1, |  | $ | 2,768.3 |  | $ | 2,768.7
Purchase of shares |  |  | — |  |  | —
Balance as of March 31, |  |  | 2,768.3 |  |  | 2,768.7
Parent Company (Grupo Mexico) common shares |  |  |  |  |  |
Balance as of January 1, |  |  | 251.3 |  |  | 232.4
Other activity, including dividend, interest and foreign currency transaction effect |  |  | 6.4 |  |  | 6.5
Balance as of March 31, |  |  | 257.7 |  |  | 238.9
Treasury stock balance as of March 31, |  | $ | 3,026.0 |  | $ | 3,007.6
Summary of non-controlling interest activity | The following table presents the non-controlling interest activity for the three months ended March 31, 2019 and 2018:
|  | 2019 |  | 2018
Balance as of January 1, |  | $ | 45.4 |  | $ | 41.7
Net earnings |  |  | 1.0 |  |  | 1.2
Dividend paid |  |  | (0.1) |  |  | (0.3)
Balance as of March 31, |  | $ | 46.3 |  | $ | 42.6
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 2019 and 2018 and the unrecognized compensation expense under this plan were as follows (in millions):
|  | 2019 |  | 2018
Stock based compensation expense |  | $ | 0.2 |  | $ | 0.2
Unrecognized compensation expense |  | $ | 2.4 |  | $ | 3.0
Schedule of stock award activity |
|  |  |  | Unit Weighted Average
|  | Shares |  | Grant Date Fair Value
Outstanding shares at January 1, 2019 |  | 1,840,336 |  | $ | 2.63
Granted |  | — |  |  | —
Exercised |  | (247,670) |  |  | 2.63
Forfeited |  | — |  |  | —
Outstanding shares at March 31, 2019 |  | 1,592,666 |  | $ | 2.63
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
Employee Stock Purchase 2018 Plan |
STOCKHOLDERS' EQUITY: |
Schedule of stock based compensation expense and unrecognized compensation expense | The stock based compensation expense for the three months ended March 31, 2019 and the unrecognized compensation expense under this plan were as follows (in millions):
|  | 2019
Stock based compensation expense |  | $ | 0.1
Unrecognized compensation expense |  | $ | 3.5
Schedule of stock award activity | The following table presents the stock award activity of this plan for the three months ended March 31, 2019:
|  |  |  | Unit Weighted Average
|  | Shares |  | Grant Date Fair Value
Outstanding shares at January 1, 2019 |  | 2,782,424 |  | $ | 1.86
Granted |  | — |  |  | —
Exercised |  | — |  |  | —
Forfeited |  | — |  |  | —
Outstanding shares at March 31, 2019 |  | 2,782,424 |  | $ | 1.86

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