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STOCKHOLDERS' EQUITY: (Tables) | 6 Months Ended
--- | ---
Jun. 30, 2023
Share based Compensation Plan |
Schedule of activity in treasury stock | ​ Activity in treasury stock in the six-month period ended June 30, 2023 and 2022 is as follows (in millions): ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2023 |  | 2022
Southern Copper common shares | ​ | ​ | ​ | ​ | ​ | ​
Balance as of January 1, | ​ | $ | 2,766.9 | ​ | $ | 2,767.2
Used for corporate purposes | ​ |  | (0.1) | ​ |  | (0.1)
Balance as of June 30, | ​ |  | 2,766.8 | ​ |  | 2,767.1
​ | ​ | ​ | ​ | ​ | ​ | ​
Parent Company (Grupo Mexico) common shares | ​ | ​ | ​ | ​ | ​ | ​
Balance as of January 1, | ​ | ​ | 340.7 | ​ |  | 306.8
Other activity, including dividend, interest and foreign currency transaction effect | ​ | ​ | 24.3 | ​ |  | 17.6
Balance as of June 30, | ​ |  | 365.0 | ​ |  | 324.4
Treasury stock balance as of June 30, | ​ | $ | 3,131.8 | ​ | $ | 3,091.5
Schedule of activity in Directors' Stock Award Plan | ​
​ | ​ | ​ | ​ | ​
​ |  | 2023 |  | 2022
Total SCC shares reserved for the plan |  | 600,000 |  | 600,000
Total shares granted at January 1, |  | (416,800) |  | (405,200)
Granted in the period |  | (6,400) |  | (5,600)
Total shares granted at June 30, |  | (423,200) |  | (410,800)
Remaining shares reserved |  | 176,800 |  | 189,200
Summary of non-controlling interest activity | The following table presents the non-controlling interest activity for the first six months of 2023 and 2022 (in millions):
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2023 |  | 2022
Balance as of January 1, |  | $ | 62.7 |  | $ | 58.6
Net earnings | ​ |  | 4.9 | ​ |  | 5.0
Dividend paid | ​ |  | (4.6) | ​ |  | (3.8)
Balance as of June 30, |  | $ | 63.0 |  | $ | 59.8
Employee Stock Purchase 2015 Plan |
Share based Compensation Plan |
Schedule of stock based compensation expense and unrecognized compensation expense | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2023 |  | 2022
Stock based compensation expense | ​ | $ | — | ​ | $ | 0.3
Unrecognized compensation expense | ​ | $ | — | ​ | $ | 0.5
Schedule of stock award activity | ​
​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ |  | Unit Weighted Average
​ | ​ | Shares | ​ | Grant Date Fair Value
Outstanding shares at January 1, 2023 |  | 845,895 | ​ | $ | 2.63
Granted |  | — | ​ |  | —
Exercised |  | (757,164) | ​ | $ | 2.63
Forfeited |  | ​ | ​ |  | —
Outstanding shares at June 30, 2023 |  | 88,731 | ​ | $ | 2.63
Outstanding shares at January 1, 2022 |  | 867,234 | ​ | $ | 2.63
Granted |  | — | ​ |  | —
Exercised |  | (16,394) | ​ | $ | 2.63
Forfeited |  | — | ​ |  | —
Outstanding shares at June 30, 2022 |  | 850,840 | ​ | $ | 2.63
​
Employee Stock Purchase 2018 Plan |
Share based Compensation Plan |
Schedule of stock based compensation expense and unrecognized compensation expense | The stock based compensation expense for the six months ended June 30, 2023 and 2022 and the unrecognized compensation expense under this plan were as follows (in millions):
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2023 | ​ | 2022
Stock based compensation expense | ​ | $ | 0.3 |  | $ | 0.3
Unrecognized compensation expense | ​ | $ | 1.8 |  | $ | 3.0
Schedule of stock award activity | ​
​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | Unit Weighted Average
​ |  | Shares |  | Grant Date Fair Value
Outstanding shares at January 1, 2023 |  | 2,754,506 | $ | 1.86
Granted |  | — | ​ | —
Exercised |  | (694,565) | $ | 1.86
Forfeited |  | — | ​ | —
Outstanding shares at June 30, 2023 |  | 2,059,941 | $ | 1.86
Outstanding shares at January 1, 2022 | ​ | 3,173,924 | $ | 1.86
Granted | ​ | — | ​ | —
Exercised | ​ | (160,236) | ​ | 1.86
Forfeited | ​ | — | ​ | —
Outstanding shares at June 30, 2022 |  | 3,013,688 | $ | 1.86

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