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STOCKHOLDERS' EQUITY: (Tables) | 9 Months Ended
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Sep. 30, 2019
STOCKHOLDERS' EQUITY: |
Schedule of activity in treasury stock | ​ Activity in treasury stock in the nine-month period ended September 30, 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
Used for corporate purposes | ​ |  | (0.4) | ​ |  | (0.4)
Balance as of September 30, | ​ |  | 2,767.9 | ​ |  | 2,768.3
​ | ​ | ​ | ​ | ​ | ​ | ​
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 | ​ |  | 20.7 | ​ |  | 17.3
Balance as of September 30, | ​ |  | 272.0 | ​ |  | 249.7
Treasury stock balance as of September 30, | ​ | $ | 3,039.9 | ​ | $ | 3,018.0
Schedule of common shares | ​
​ | ​ | ​ | ​ | ​
​ |  | 2019 |  | 2018
Southern Copper common shares | ​ | ​ | ​ | ​
Directors’ Stock Award Plan | ​ | 14,400 | ​ | 16,000
​ | ​ | ​ | ​ | ​
Parent Company (Grupo Mexico) common shares | ​ | ​ | ​ | ​
Employee stock purchase plan (shares in millions) | ​ | 0.4 | ​ | 1.3
Summary of non-controlling interest activity | The following table presents the non-controlling interest activity for the nine months ended September 30, 2019 and 2018 (in millions): ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2019 |  | 2018
Balance as of January 1, |  | $ | 45.4 |  | $ | 41.7
Net earnings | ​ |  | 4.7 | ​ |  | 3.9
Dividend paid | ​ |  | (1.1) | ​ |  | (1.2)
Balance as of September 30, |  | $ | 49.0 |  | $ | 44.4
Employee Stock Purchase 2015 Plan |
STOCKHOLDERS' EQUITY: |
Schedule of stock based compensation expense and unrecognized compensation expense | ​ The stock based compensation expense for the nine months 2019 and 2018 and the unrecognized compensation expense under this plan were as follows (in millions): ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2019 |  | 2018
Stock based compensation expense | ​ | $ | 0.4 | ​ | $ | 0.4
Unrecognized compensation expense | ​ | $ | 2.2 | ​ | $ | 2.8
​
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 |  | (437,386) | ​ | $ | 2.63
Forfeited |  | — | ​ |  | —
Outstanding shares at September 30, 2019 |  | 1,402,950 | ​ | $ | 2.63
Outstanding shares at January 1, 2018 |  | 2,293,120 | ​ | $ | 2.63
Granted |  | — | ​ |  | —
Exercised |  | (306,817) | ​ | $ | 2.63
Forfeited |  | — | ​ |  | —
Outstanding shares at September 30, 2018 |  | 1,986,303 | ​ | $ | 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 nine months ended September 30, 2019 and the unrecognized compensation expense under this plan were as follows (in millions): ​
​ | ​ | ​ | ​
​ |  | 2019
Stock based compensation expense | ​ | $ | 0.5
Unrecognized compensation expense | ​ | $ | 4.7
​ ​ The following table presents the stock award activity of this plan for the nine months ended September 30, 2019: ​
​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | Unit Weighted Average
​ |  | Shares |  | Grant Date Fair Value
Outstanding shares at January 1, 2019 |  | 2,782,424 |  | 1.86
Granted |  | 1,238,169 |  | 1.86
Exercised |  | — |  | —
Forfeited |  | — | ​ | —
Outstanding shares at September 30, 2019 |  | 4,020,593 | ​ | 1.86
​
Schedule of stock award activity | ​

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