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INCOME TAXES: (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Income Taxes |  |  |  |
Statutory income tax provision |  |  | $ 985.8 | $ 972.7
Peruvian royalty |  |  | 30.2 | 24.7
Mexican royalty |  |  | 102.5 | 97.9
Peruvian special mining tax |  |  | 51.7 | 41.7
Total income tax provision | $ 395.3 | $ 228.5 | $ 1,170.2 | $ 1,137.0
Effective income tax rate (as a percent) |  |  | 36.90% | 39.50%
Unrecognized tax benefits | $ 25.6 |  | $ 25.6 |
Peru |  |  |  |
Income Taxes |  |  |  |
Royalty charges |  |  | 81.9 | $ 66.4
Increase (Decrease) in Income tax expense (benefit) |  |  | 15.8 |
Mexico |  |  |  |
Income Taxes |  |  |  |
Mexican royalty |  |  | 102.5 | $ 97.9
Liability that increased tax expense |  |  | $ 26.5 |

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