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INCOME TAXES: (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021
Income Taxes |  |  |  |
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 | $ 228.5 | $ 548.6 | $ 1,137.0 | $ 1,703.8
Effective income tax rate (as a percent) |  |  | 39.50% | 40.00%
Peru |  |  |  |
Income Taxes |  |  |  |
Increase (Decrease) in Income tax expense (benefit) |  |  | $ 58.0 |
Royalty charges |  |  | 66.4 | $ 154.3
Mexico |  |  |  |
Income Taxes |  |  |  |
Mexican royalty |  |  | $ 97.9 | $ 162.5

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