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STOCKHOLDERS' EQUITY (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2023
Share based Compensation Plan |
Schedule of activity in treasury stock | ​ Activity in treasury stock in the years 2023 and 2022 was 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 | ​ |  | (0.3) | ​ |  | (0.3)
Balance as of December 31, | ​ |  | 2,766.6 | ​ |  | 2,766.9
​ | ​ | ​ | ​ | ​ | ​ | ​
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 | ​ |  | 41.7 | ​ |  | 33.9
Balance as of December 31, | ​ |  | 382.4 | ​ |  | 340.7
Treasury stock balance as of December 31, | ​ | $ | 3,149.0 | ​ | $ | 3,107.6
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 |  | (12,000) |  | (11,600)
Total shares granted at December 31, |  | (428,800) |  | (416,800)
Remaining shares reserved |  | 171,200 |  | 183,200
​
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 years ended December 31, 2023, 2022 and 2021 and the unrecognized compensation expense under this plan were as follows (in millions):
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2023 |  | 2022 |  | 2021
Stock based compensation expense | ​ | $ | 0.2 | ​ | $ | 0.6 | ​ | $ | 0.6
Unrecognized compensation expense | ​ | $ | — | ​ | $ | 0.2 | ​ | $ | 0.8
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 |  | (801,056) | ​ | $ | 2.63
Forfeited |  | — | ​ |  | —
Outstanding shares at December 31, 2023 |  | 44,839 | ​ | $ | 2.63
Outstanding shares at January 1, 2022 |  | 867,234 | ​ | $ | 2.63
Granted |  | — | ​ |  | —
Exercised |  | (21,339) | ​ | $ | 2.63
Forfeited |  | — | ​ |  | —
Outstanding shares at December 31, 2022 |  | 845,895 | ​ | $ | 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 years ended December 31, 2023, 2022 and 2021 and the unrecognized compensation expense under this plan were as follows (in millions): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2023 | ​ | 2022 | ​ | 2021
Stock based compensation expense | ​ | $ | 0.7 |  | $ | 0.7 |  | $ | 0.7
Unrecognized compensation expense | ​ | $ | 1.7 |  | $ | 2.4 |  | $ | 3.1
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 |  | (791,570) | ​ | $ | 1.86
Forfeited |  | — | ​ |  | —
Outstanding shares at December 31, 2023 |  | 1,962,936 | ​ | $ | 1.86
Outstanding shares at January 1, 2022 | ​ | 3,173,924 | ​ | $ | 1.86
Granted | ​ | — | ​ | ​ | —
Exercised | ​ | (419,418) | ​ | $ | 1.86
Forfeited | ​ | — | ​ |  | —
Outstanding shares at December 31, 2022 |  | 2,754,506 | ​ | $ | 1.86

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