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STOCKHOLDERS' EQUITY: (Tables) | 9 Months Ended
--- | ---
Sep. 30, 2025
Share based Compensation Plan |
Schedule of activity in treasury stock | Activity in treasury stock in the nine-month periods ended September 30, 2025 and 2024 was as follows (in millions): ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2025 |  | 2024
Southern Copper common shares | ​ | ​ | ​ | ​ | ​ | ​
Balance as of January 1, | ​ | $ | 2,337.3 | ​ | $ | 2,766.7
Dividends paid in common stock | ​ |  | (540.3) | ​ |  | (308.1)
Used for corporate purposes | ​ |  | (0.2) | ​ |  | (0.3)
Balance as of September 30, | ​ |  | 1,796.8 | ​ |  | 2,458.3
​ | ​ | ​ | ​ | ​ | ​ | ​
Parent Company (Grupo Mexico) common shares | ​ | ​ | ​ | ​ | ​ | ​
Balance as of January 1, | ​ |  | 363.4 | ​ |  | 382.3
Other activity, including dividend, interest and foreign currency translation effect | ​ |  | 31.4 | ​ |  | (9.6)
Balance as of September 30, | ​ |  | 394.7 | ​ |  | 372.7
Treasury stock balance as of September 30, | ​ | $ | 2,191.5 | ​ | $ | 2,831.0
Schedule of activity in Directors' Stock Award Plan | ​
​ | ​ | ​ | ​ | ​
​ |  | 2025 |  | 2024
Total SCC shares reserved for the plan |  | 600,000 |  | 600,000
Total shares granted at January 1, |  | (444,400) |  | (428,800)
Granted in the period |  | (9,600) |  | (12,400)
Total shares granted at September 30, |  | (454,000) |  | (441,200)
Remaining shares reserved |  | 146,000 |  | 158,800
Summary of non-controlling interest activity | The following table presents the non-controlling interest activity for the nine-month periods ended September 30, 2025 and 2024 (in millions): ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2025 |  | 2024
Balance as of January 1, |  | $ | 66.6 |  | $ | 63.1
Net earnings | ​ |  | 9.7 | ​ |  | 9.5
Dividend paid | ​ |  | (9.2) | ​ |  | (4.2)
Balance as of September 30, |  | $ | 67.0 |  | $ | 68.4
​
Employee Stock Purchase 2018 Plan |
Share based Compensation Plan |
Schedule of stock award activity | ​
​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | Unit Weighted Average
​ |  | Shares | ​ | Grant Date Fair Value
Outstanding shares at January 1, 2025 |  | 1,901,089 | ​ | $ | 1.86
Granted |  | — | ​ | ​ | —
Exercised |  | (617,756) | ​ | $ | 1.86
Forfeited |  | — | ​ | ​ | —
Outstanding shares at September 30, 2025 |  | 1,283,333 | ​ | $ | 1.86
Outstanding shares at January 1, 2024 | ​ | 1,962,936 | ​ | $ | 1.86
Granted | ​ | — | ​ | ​ | —
Exercised | ​ | (49,470) | ​ | $ | 1.86
Forfeited | ​ | — | ​ | ​ | —
Outstanding shares at September 30, 2024 |  | 1,913,466 | ​ | $ | 1.86
Schedule of stock based compensation expense and unrecognized compensation expense | The stock based compensation expense for the nine-month periods ended September 30, 2025 and 2024 and the unrecognized compensation expense under this plan were as follows (in millions): ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2025 | ​ | 2024
Stock based compensation expense | ​ | $ | 0.5 |  | $ | 0.5
Unrecognized compensation expense | ​ | $ | 0.7 |  | $ | 1.2
Employee Stock Purchase 2025 Plan |
Share based Compensation Plan |
Schedule of stock award activity | ​
​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | Unit Weighted Average
​ |  | Shares | ​ | Grant Date Fair Value
Outstanding shares at January 1, 2025 |  | — | ​ | ​ | —
Granted |  | 2,514,986 | ​ | $ | 4.51
Exercised |  | — | ​ |  | —
Forfeited |  | — | ​ | ​ | —
Outstanding shares at September 30, 2025 |  | 2,514,986 | ​ | $ | 4.51
Schedule of stock based compensation expense and unrecognized compensation expense | The stock-based compensation expense and the unrecognized compensation expense under this plan for the nine-month periods ended September 30, 2025 and 2024 were as follows (in millions): ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2025 | ​ | 2024
Stock based compensation expense | ​ | $ | 0.3 |  | $ | —
Unrecognized compensation expense | ​ | $ | 4.2 |  | $ | —

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