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INCOME TAXES: (Tables) | 3 Months Ended
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Mar. 31, 2024
INCOME TAXES: |
Schedule of income tax provision and effective income tax rate | The income tax provision and the effective income tax rate for the three-month period ended March 31, 2024 and 2023 consisted of (in millions):
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2024 |  | 2023 | ​
Statutory income tax provision | ​ | $ | 363.1 | ​ | $ | 399.0 | ​
Peruvian royalty | ​ |  | 9.9 | ​ |  | 9.8 | ​
Mexican royalty | ​ |  | 30.6 | ​ |  | 51.7 | ​
Peruvian special mining tax | ​ |  | 19.8 | ​ |  | 20.0 | ​
Total income tax provision | ​ | $ | 423.4 | ​ | $ | 480.5 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Effective income tax rate | ​ | ​ | 36.6 | % | ​ | 36.9 | %

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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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