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STOCKHOLDERS'EQUITY: (Tables) | 6 Months Ended
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Jun. 30, 2026
STOCKHOLDERS'EQUITY: |
Schedule of activity in treasury stock | Activity in treasury stock in the six-month periods ended June 30, 2026 and 2025 was as follows (in millions): ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ ​ ​ | 2026 | ​ ​ ​ | 2025
Southern Copper common shares | ​ | ​ | ​ | ​ | ​ | ​
Balance as of January 1, | ​ | $ | 1,625.4 | ​ | $ | 2,337.3
Dividends paid in common stock | ​ |  | (377.8) | ​ |  | (338.8)
Used for corporate purposes | ​ |  | (0.2) | ​ |  | (0.2)
Balance as of June 30, | ​ |  | 1,247.4 | ​ |  | 1,998.4
​ | ​ | ​ | ​ | ​ | ​ | ​
Parent Company (Grupo Mexico) common shares | ​ | ​ | ​ | ​ | ​ | ​
Balance as of January 1, | ​ |  | 408.8 | ​ |  | 363.4
Other activity, including dividend, interest and foreign currency translation effect | ​ |  | 25.9 | ​ |  | 10.2
Balance as of June 30, | ​ |  | 434.7 | ​ |  | 373.5
Treasury stock balance as of June 30, | ​ | $ | 1,682.1 | ​ | $ | 2,371.9
Schedule of Stock dividend activity | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | Total | ​ | Effect in | ​ | ​ | ​
​ | ​ | Common stock | ​ | Average | ​ | Number of | ​ | Additional | ​ | Effect in
​ | ​ | dividend | ​ | Market price | ​ | Shares Paid | ​ | Paid-in capital | ​ | Treasury Stock
Date of payment | ​ | per share | ​ | per share | ​ | as Dividends | ​ | ($ in millions) | ​ | ($ in millions)
February 27, 2026 |  | 0.0085 | ​ | $ | 179.93 |  | 6,961,959 |  | $ | 1,079.9 |  | $ | 172.8
May 29, 2026 |  | 0.0100 | ​ | $ | 187.45 |  | 8,260,265 |  | ​ | 1,343.4 |  | ​ | 205.0
Total |  | 0.0185 | ​ | ​ | ​ |  | 15,222,224 |  | $ | 2,423.3 | ​ | $ | 377.8
Schedule of activity in Directors' Stock Award Plan | ​
​ | ​ | ​ | ​ | ​
​ | ​ ​ ​ | 2026 | ​ ​ ​ | 2025
Total SCC shares reserved for the plan |  | 600,000 |  | 600,000
Total shares granted at January 1, |  | (457,200) |  | (444,400)
Granted in the period |  | (8,000) |  | (6,400)
Total shares granted at June 30, |  | (465,200) |  | (450,800)
Remaining shares reserved |  | 134,800 |  | 149,200
Summary of non-controlling interest activity | The following table presents the non-controlling interest activity for the six-month periods ended June 30, 2026 and 2025 (in millions): ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ ​ ​ | 2026 | ​ ​ ​ | 2025
Balance as of January 1, |  | $ | 66.8 |  | $ | 66.6
Net earnings | ​ |  | 9.6 | ​ |  | 6.4
Dividend paid | ​ |  | — | ​ |  | (4.4)
Balance as of June 30, |  | $ | 76.4 |  | $ | 68.6
​
Employee Stock Purchase 2018 Plan |
STOCKHOLDERS'EQUITY: |
Schedule of stock based compensation expense and unrecognized compensation expense | The stock based compensation expense for the six-month periods ended June 30, 2026 and 2025 and the unrecognized compensation expense under this plan were as follows (in millions): ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ ​ ​ | 2026 | ​ | 2025
Stock based compensation expense | ​ | $ | 0.3 |  | $ | 0.3
Unrecognized compensation expense | ​ | $ | — |  | $ | 0.7
Schedule of stock award activity | ​
​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | Unit Weighted Average
​ | ​ ​ ​ | Shares | ​ | Grant Date Fair Value
Outstanding shares at January 1, 2026 |  | 1,202,943 | ​ | $ | 1.86
Granted |  | — | ​ | ​ | —
Exercised |  | (20,302) | ​ | $ | 1.86
Forfeited |  | — | ​ | ​ | —
Outstanding shares at June 30, 2026 |  | 1,182,641 | ​ | $ | 1.86
Outstanding shares at January 1, 2025 | ​ | 1,901,089 | ​ | $ | 1.86
Granted | ​ | — | ​ | ​ | —
Exercised | ​ | (602,500) | ​ | $ | 1.86
Forfeited | ​ | — | ​ | ​ | —
Outstanding shares at June 30, 2025 |  | 1,298,589 | ​ | $ | 1.86
Employee Stock Purchase 2025 Plan |
STOCKHOLDERS'EQUITY: |
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 six-month periods ended June 30, 2026 and 2025 were as follows (in millions): ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ ​ ​ | 2026 | ​ | 2025
Stock based compensation expense | ​ | $ | 0.3 |  | $ | —
Unrecognized compensation expense | ​ | $ | 3.8 |  | $ | —
Schedule of stock award activity | ​
​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | Unit Weighted Average
​ | ​ ​ ​ | Shares | ​ | Grant Date Fair Value
Outstanding shares at January 1, 2026 |  | 2,496,658 | ​ | $ | 4.51
Granted |  | — | ​ | ​ | —
Exercised |  | — | ​ |  | —
Forfeited |  | (79,443) | ​ | ​ | 4.51
Outstanding shares at June 30, 2026 |  | 2,417,215 | ​ | $ | 4.51
Outstanding shares at January 1, 2025 | ​ | — | ​ | $ | —
Granted | ​ | 2,372,449 | ​ | $ | 4.51
Exercised | ​ | — | ​ | ​ | —
Forfeited | ​ | — | ​ | ​ | —
Outstanding shares at June 30, 2025 |  | 2,372,449 | ​ | $ | 4.51

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