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INCOME TAXES: (Tables) | 9 Months Ended
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Sep. 30, 2022
INCOME TAXES: |
Schedule of income tax provision and effective income tax rate | ​ The income tax provision and the effective income tax rate for the nine-month periods ended September 30, 2022 and 2021 consisted of (in millions):
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2022 |  | 2021 | ​
Statutory income tax provision | ​ | $ | 972.7 | ​ | $ | 1,387.0 | ​
Peruvian royalty | ​ |  | 24.7 | ​ |  | 70.1 | ​
Mexican royalty | ​ |  | 97.9 | ​ |  | 162.5 | ​
Peruvian special mining tax | ​ |  | 41.7 | ​ |  | 84.2 | ​
Total income tax provision | ​ | $ | 1,137.0 | ​ | $ | 1,703.8 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Effective income tax rate | ​ | ​ | 39.5 | % | ​ | 40.0 | %

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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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