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INCOME TAXES: (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Income Taxes |  |  |  |
Statutory income tax provision |  |  | $ 752.9 | $ 956.4
Peruvian royalty |  |  | 26.5 | 38.9
Mexican royalty |  |  | 87.4 | 107.9
Peruvian special mining tax |  |  | 41.7 | 52.0
Total income tax provision | $ 296.4 | $ 647.7 | $ 908.5 | $ 1,155.2
Effective income tax rate (as a percent) |  |  | 42.60% | 40.60%
Peru |  |  |  |
Income Taxes |  |  |  |
Increase (Decrease) in Income tax expense (benefit) |  |  | $ 33.1 |
Royalty charges |  |  | 68.2 | $ 90.9
Mexico |  |  |  |
Income Taxes |  |  |  |
Mexican royalty |  |  | $ 87.4 | $ 107.9

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