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INCOME TAXES: (Tables) | 6 Months Ended
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Jun. 30, 2023
INCOME TAXES: |
Schedule of income tax provision and effective income tax rate | ​ The income tax provision and the effective income tax rate for the first six months of 2023 and 2022 consisted of (in millions):
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2023 |  | 2022 | ​
Statutory income tax provision | ​ | $ | 649.2 | ​ | $ | 752.9 | ​
Peruvian royalty | ​ |  | 18.7 | ​ |  | 26.5 | ​
Mexican royalty | ​ |  | 72.3 | ​ |  | 87.4 | ​
Peruvian special mining tax | ​ |  | 34.7 | ​ |  | 41.7 | ​
Total income tax provision | ​ | $ | 774.9 | ​ | $ | 908.5 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Effective income tax rate | ​ | ​ | 36.0 | % | ​ | 42.6 | %

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