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INCOME TAXES: (Tables) | 6 Months Ended
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Jun. 30, 2026
INCOME TAXES: |
Schedule of income tax provision and effective income tax rate | The income tax provision and the effective income tax rate for the six-month periods ended June 30, 2026 and 2025 consisted of (in millions):
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ ​ ​ | 2026 | ​ ​ ​ | 2025 | ​
Statutory income tax provision | ​ | $ | 1,505.1 | ​ | $ | 930.0 | ​
Peruvian royalty | ​ |  | 69.7 | ​ |  | 33.3 | ​
Mexican royalty | ​ |  | 175.2 | ​ |  | 94.7 | ​
Peruvian special mining tax | ​ |  | 86.3 | ​ |  | 50.7 | ​
Total income tax provision | ​ | $ | 1,836.3 | ​ | $ | 1,108.7 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Effective income tax rate | ​ | ​ | 36.4 | % | ​ | 36.7 | %

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- Definition Disclosure of the income tax provision attributable to continuing operations and the effective income tax rate. + References No definition available. + Details
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- References No definition available. + Details
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