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STOCKHOLDERS' EQUITY: (Tables) | 9 Months Ended
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Sep. 30, 2022
Share based Compensation Plan |
Schedule of activity in treasury stock | ​ Activity in treasury stock in the nine-month period ended September 30, 2022 and 2021 is as follows (in millions): ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2022 |  | 2021
Southern Copper common shares | ​ | ​ | ​ | ​ | ​ | ​
Balance as of January 1, | ​ | $ | 2,767.2 | ​ | $ | 2,767.5
Used for corporate purposes | ​ |  | (0.2) | ​ |  | (0.1)
Balance as of September 30, | ​ |  | 2,767.0 | ​ |  | 2,767.4
​ | ​ | ​ | ​ | ​ | ​ | ​
Parent Company (Grupo Mexico) common shares | ​ | ​ | ​ | ​ | ​ | ​
Balance as of January 1, | ​ |  | 306.8 | ​ |  | 296.0
Other activity, including dividend, interest and foreign currency transaction effect | ​ |  | 22.5 | ​ |  | 17.4
Balance as of September 30, | ​ |  | 329.3 | ​ |  | 313.4
Treasury stock balance as of September 30, | ​ | $ | 3,096.3 | ​ | $ | 3,080.8
Schedule of activity in Directors' Stock Award Plan | ​
​ | ​ | ​ | ​ | ​
​ |  | 2022 |  | 2021
Total SCC shares reserved for the plan |  | 600,000 |  | 600,000
Total shares granted at January 1, |  | (405,200) |  | (391,600)
Granted in the period |  | (8,800) |  | (8,000)
Total shares granted at September 30, |  | (414,000) |  | (399,600)
Remaining shares reserved |  | 186,000 |  | 200,400
Summary of non-controlling interest activity | The following table presents the non-controlling interest activity for the nine months ended September 30, 2022 and 2021 (in millions):
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2022 |  | 2021
Balance as of January 1, |  | $ | 58.6 |  | $ | 51.2
Net earnings | ​ |  | 6.8 | ​ |  | 10.6
Dividend paid | ​ |  | (4.2) | ​ |  | (4.4)
Balance as of September 30, |  | $ | 61.2 |  | $ | 57.4
Employee Stock Purchase 2015 Plan |
Share based Compensation Plan |
Schedule of stock based compensation expense and unrecognized compensation expense | ​ The stock based compensation expense for the first nine months of 2022 and 2021 and the unrecognized compensation expense under this plan were as follows (in millions):
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2022 |  | 2021
Stock based compensation expense | ​ | $ | 0.5 | ​ | $ | 0.5
Unrecognized compensation expense | ​ | $ | 0.5 | ​ | $ | 1.0
​
Schedule of stock award activity | ​
​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ |  | Unit Weighted Average
​ | ​ | Shares | ​ | Grant Date Fair Value
Outstanding shares at January 1, 2022 |  | 867,234 | ​ | $ | 2.63
Granted |  | — | ​ |  | —
Exercised |  | (21,339) | ​ | $ | 2.63
Forfeited |  | — | ​ |  | —
Outstanding shares at September 30, 2022 |  | 845,895 | ​ | $ | 2.63
Outstanding shares at January 1, 2021 |  | 1,264,410 | ​ | $ | 2.63
Granted |  | — | ​ |  | —
Exercised |  | (381,288) | ​ | $ | 2.63
Forfeited |  | — | ​ |  | —
Outstanding shares at September 30, 2021 |  | 883,122 | ​ | $ | 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 nine months ended September 30, 2022 and 2021 and the unrecognized compensation expense under this plan were as follows (in millions): ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2022 | ​ | 2021
Stock based compensation expense | ​ | $ | 0.5 |  | $ | 0.5
Unrecognized compensation expense | ​ | $ | 2.6 |  | $ | 3.3
Schedule of stock award activity | ​
​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | Unit Weighted Average
​ |  | Shares |  | Grant Date Fair Value
Outstanding shares at January 1, 2022 |  | 3,173,924 | $ | 1.86
Granted |  | — | ​ | —
Exercised |  | (312,907) | $ | 1.86
Forfeited |  | — | ​ | —
Outstanding shares at September 30, 2022 |  | 2,861,017 | $ | 1.86
Outstanding shares at January 1, 2021 | ​ | 3,918,458 | $ | 1.86
Granted | ​ | — | ​ | —
Exercised | ​ | (716,449) | $ | 1.86
Forfeited | ​ | — | ​ | —
Outstanding shares at September 30, 2021 |  | 3,202,009 | $ | 1.86

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