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INCOME TAXES: (Details) - USD ($) $ in Millions |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
May 31, 2019 | Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
INCOME TAXES |  |  |  |  |
Statutory income tax provision |  |  |  | $ 1,298.7 | $ 985.8
Peruvian royalty |  |  |  | 45.5 | 30.2
Mexican royalty |  |  |  | 116.3 | 102.5
Peruvian special mining tax |  |  |  | 68.1 | 51.7
Total provision for income taxes |  | $ 526.4 | $ 395.3 | $ 1,528.6 | $ 1,170.2
Effective income tax rate (as a percent) |  |  |  | 37.20% | 36.90%
Global minimum tax rate | 15.00% |  |  |  |
Peru |  |  |  |  |
INCOME TAXES |  |  |  |  |
Royalty charges |  |  |  | $ 113.6 | $ 81.9
Income Taxes Paid |  |  |  | 72.5 |
Increase (Decrease) in Income tax expense (benefit) |  |  |  | 15.5 |
Unrecognized tax benefits |  | 19.2 |  | 19.2 |
Mexico |  |  |  |  |
INCOME TAXES |  |  |  |  |
Mexican royalty |  |  |  | 116.3 | $ 102.5
Income Taxes Paid |  |  |  | 19.5 |
Increase (Decrease) in Income tax expense (benefit) |  |  |  | 12.1 |
Unrecognized tax benefits |  | $ 10.7 |  | $ 10.7 |

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