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STOCKHOLDERS' EQUITY (Tables) | 6 Months Ended
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Jun. 30, 2022
Share based Compensation Plan |
Schedule of activity in treasury stock | ​ Activity in treasury stock in the six-month period ended March 31, 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 | ​ |  | (0.1) | ​ |  | (0.1)
Balance as of June 30, | ​ |  | 2,767.1 | ​ |  | 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 | ​ |  | 17.6 | ​ |  | 12.4
Balance as of June 30, | ​ |  | 324.4 | ​ |  | 308.4
Treasury stock balance as of June 30, | ​ | $ | 3,091.5 | ​ | $ | 3,075.8
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 |  | (5,600) |  | (8,000)
Total shares granted at June 30, |  | (410,800) |  | (399,600)
Remaining shares reserved |  | 189,200 |  | 200,400
Summary of non-controlling interest activity | The following table presents the non-controlling interest activity for the six months ended June 30, 2022 and 2021 (in millions):
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2022 |  | 2021
Balance as of January 1, |  | $ | 58.6 |  | $ | 51.2
Net earnings | ​ |  | 5.0 | ​ |  | 7.0
Dividend paid | ​ |  | (3.8) | ​ |  | (2.9)
Balance as of June 30, |  | $ | 59.8 |  | $ | 55.3
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 six months of 2022 and 2021 and the unrecognized compensation expense under this plan were as follows (in millions):
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2022 |  | 2021
Stock based compensation expense | ​ | $ | 0.3 | ​ | $ | 0.3
Unrecognized compensation expense | ​ | $ | 0.5 | ​ | $ | 1.1
​
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 |  | (16,394) | ​ | $ | 2.63
Forfeited |  | — | ​ |  | —
Outstanding shares at June 30, 2022 |  | 850,840 | ​ | $ | 2.63
Outstanding shares at January 1, 2021 |  | 1,264,410 | ​ | $ | 2.63
Granted |  | — | ​ |  | —
Exercised |  | (370,959) | ​ | $ | 2.63
Forfeited |  | — | ​ |  | —
Outstanding shares at June 30, 2021 |  | 893,451 | ​ | $ | 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, 2022 and 2021 and the unrecognized compensation expense under this plan were as follows (in millions):
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2022 | ​ | 2021
Stock based compensation expense | ​ | $ | 0.3 |  | $ | 0.3
Unrecognized compensation expense | ​ | $ | 3.0 |  | $ | 3.6
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 |  | (160,236) | $ | 1.86
Forfeited |  | — | ​ | —
Outstanding shares at June 30, 2022 |  | 3,013,688 | $ | 1.86
Outstanding shares at January 1, 2021 | ​ | 3,918,458 | $ | 1.86
Granted | ​ | — | ​ | —
Exercised | ​ | (625,742) | ​ | 1.86
Forfeited | ​ | — | ​ | —
Outstanding shares at June 30, 2021 |  | 3,292,716 | $ | 1.86

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