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STOCKHOLDERS' EQUITY: (Tables) | 6 Months Ended
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Jun. 30, 2019
STOCKHOLDERS' EQUITY: |
Schedule of activity in treasury stock | ​ Activity in treasury stock in the six-month period ended June 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
Purchase of shares | ​ |  | — | ​ |  | —
Used for corporate purposes | ​ |  | (0.4) | ​ |  | (0.4)
Balance as of June 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 | ​ |  | 13.2 | ​ |  | 8.4
Balance as of June 30, | ​ |  | 264.5 | ​ |  | 240.8
Treasury stock balance as of June 30, | ​ | $ | 3,032.4 | ​ | $ | 3,009.1
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 six months ended June 30, 2019 and 2018: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2019 |  | 2018
Balance as of January 1, |  | $ | 45.4 |  | $ | 41.7
Net earnings | ​ |  | 3.0 | ​ |  | 2.6
Dividend paid | ​ |  | (0.1) | ​ |  | (0.9)
Balance as of June 30, |  | $ | 48.3 |  | $ | 43.4
​
Employee Stock Purchase 2015 Plan |
STOCKHOLDERS' EQUITY: |
Schedule of stock based compensation expense and unrecognized compensation expense | ​ The stock based compensation expense for the first six months 2019 and 2018 and the unrecognized compensation expense under this plan were as follows (in millions): ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2019 |  | 2018
Stock based compensation expense | ​ | $ | 0.3 | ​ | $ | 0.3
Unrecognized compensation expense | ​ | $ | 2.3 | ​ | $ | 2.9
​
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 |  | (425,076) | ​ | $ | 2.63
Forfeited |  | — | ​ |  | —
Outstanding shares at June 30, 2019 |  | 1,415,260 | ​ | $ | 2.63
Outstanding shares at January 1, 2018 |  | 2,293,120 | ​ | $ | 2.63
Granted |  | — | ​ |  | —
Exercised |  | (49,320) | ​ | $ | 2.63
Forfeited |  | — | ​ |  | —
Outstanding shares at June 30, 2018 |  | 2,243,800 | ​ | $ | 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 first six months ended June 30, 2019 and the unrecognized compensation expense under this plan were as follows (in millions): ​
​ | ​ | ​ | ​
​ |  | 2019
Stock based compensation expense | ​ | $ | 0.2
Unrecognized compensation expense | ​ | $ | 3.4
​
Schedule of stock award activity | The following table presents the stock award activity of this plan for the six months ended June 30, 2019: ​
​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | Unit Weighted Average
​ |  | Shares |  | Grant Date Fair Value
Outstanding shares at January 1, 2019 |  | 2,782,424 |  | 1.86
Granted |  | — |  | —
Exercised |  | — |  | 1.86
Forfeited |  | — | ​ | —
Outstanding shares at June 30, 2019 |  | 2,782,424 | ​ | 1.86
​

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