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INCOME TAXES: (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Income Taxes |  |  |  |
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 | $ 294.5 | $ 296.4 | $ 774.9 | $ 908.5
Effective income tax rate (as a percent) |  |  | 36.00% | 42.60%
Unrecognized tax benefits | $ 26.8 |  | $ 26.8 |
Peru |  |  |  |
Income Taxes |  |  |  |
Increase (Decrease) in Income tax expense (benefit) |  |  | 13.4 |
Royalty charges |  |  | 53.4 | $ 68.2
Mexico |  |  |  |
Income Taxes |  |  |  |
Mexican royalty |  |  | 72.3 | $ 87.4
Liability that increased tax expense |  |  | $ 13.8 |

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