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INCOME TAXES: | 9 Months Ended
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Sep. 30, 2022
INCOME TAXES: |
INCOME TAXES: | NOTE 4 — INCOME TAXES: ​ 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 | %
​ These provisions include income taxes for Peru, Mexico and the United States. The Mexican royalty, the Peruvian royalty and the Peruvian special mining tax are included in the income tax provision. The decrease in the effective income tax rate in 2022 compared to the same period in 2021 was primarily attributable to the matching of account balances in the Peruvian jurisdiction. ​ Peruvian royalty and special mining tax: The Company has accrued $66.4 million and $154.3 million of royalty charge and special mining tax as part of the income tax provision for the first nine months of 2022 and 2021, respectively. ​ Mexican mining royalty: The Company has accrued $97.9 million and $162.5 million of royalty taxes as part of the income tax provision for the first nine months of 2022 and 2021, respectively. ​ Accounting for uncertainty in income taxes: In the first nine months of 2022, the Company received a refund and recorded a current liability and non-current liability for the Peruvian jurisdiction that increased the tax expense by approximately $58.0 million. ​ Tax Law Changes: On December 28, 2021, the U.S. Treasury and the IRS released final regulations addressing various aspects of the foreign tax credit regime. The regulations apply to years beginning after December 28, 2021 and they are not expected to have a material impact on the Company’s financial statements.

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