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STOCKHOLDERS' EQUITY: (Tables) | 3 Months Ended
--- | ---
Mar. 31, 2024
Share based Compensation Plan |
Schedule of activity in treasury stock | Activity in treasury stock in the three-month period ended March 31, 2024 and 2023 is as follows (in millions):
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2024 |  | 2023
Southern Copper common shares | ​ | ​ | ​ | ​ | ​ | ​
Balance as of January 1, | ​ | $ | 2,766.6 | ​ | $ | 2,766.9
Used for corporate purposes | ​ |  | (*) | ​ |  | (0.1)
Balance as of March 31, | ​ |  | 2,766.6 | ​ |  | 2,766.8
​ | ​ | ​ | ​ | ​ | ​ | ​
Parent Company (Grupo Mexico) common shares | ​ | ​ | ​ | ​ | ​ | ​
Balance as of January 1, | ​ |  | 382.3 | ​ |  | 340.7
Other activity, including dividend, interest and foreign currency translation effect | ​ |  | 8.3 | ​ |  | 7.6
Balance as of March 31, | ​ |  | 390.6 | ​ |  | 348.3
Treasury stock balance as of March 31, | ​ | $ | 3,157.2 | ​ | $ | 3,115.1
(*) Less than $0.1 million.
Schedule of activity in Directors' Stock Award Plan | ​
​ | ​ | ​ | ​ | ​
​ |  | 2024 |  | 2023
Total SCC shares reserved for the plan |  | 600,000 |  | 600,000
Total shares granted at January 1, |  | (428,800) |  | (416,800)
Granted in the period |  | (2,800) |  | (3,200)
Total shares granted at March 31, |  | (431,600) |  | (420,000)
Remaining shares reserved |  | 168,400 |  | 180,000
Summary of non-controlling interest activity | The following table presents the non-controlling interest activity the three-month period ended March 31, 2024 and 2023 (in millions):
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2024 |  | 2023
Balance as of January 1, |  | $ | 63.1 |  | $ | 62.7
Net earnings | ​ |  | 2.8 | ​ |  | 2.7
Dividend paid | ​ |  | (1.7) | ​ |  | (1.8)
Balance as of March 31, |  | $ | 64.2 |  | $ | 63.6
​
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 three-month period ended March 31, 2024 and 2023 and the unrecognized compensation expense under this plan were as follows (in millions):
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2024 | ​ | 2023
Stock based compensation expense | ​ | $ | 0.2 |  | $ | 0.2
Unrecognized compensation expense | ​ | $ | 1.5 |  | $ | 2.2
Schedule of stock award activity | ​
​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | Unit Weighted Average
​ |  | Shares |  | Grant Date Fair Value
Outstanding shares at January 1, 2024 |  | 1,962,936 | $ | 1.86
Granted |  | — | $ | —
Exercised |  | (22,216) |  | 1.86
Forfeited |  | ​ | ​ | —
Outstanding shares at March 31, 2024 |  | 1,940,720 | $ | 1.86
Outstanding shares at January 1, 2023 | ​ | 2,754,506 | $ | 1.86
Granted | ​ | — | ​ | —
Exercised | ​ | (624,026) | ​ | —
Forfeited | ​ | — | ​ | —
Outstanding shares at March 31, 2023 |  | 2,130,480 | $ | 1.86

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