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INCOME TAXES: (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2022 | Mar. 31, 2021
Income Taxes |  |
Statutory income tax provision | $ 511.6 | $ 427.3
Peruvian royalty | 17.0 | 11.6
Mexican royalty | 58.0 | 47.4
Peruvian special mining tax | 25.5 | 21.2
Total income tax provision | $ 612.1 | $ 507.5
Effective income tax rate (as a percent) | 43.80% | 40.10%
Unrecognized tax benefits | $ 22.1 |
Peru |  |
Income Taxes |  |
Increase (Decrease) in Income tax expense (benefit) | 33.8 |
Royalty charges | 42.5 | $ 32.8
Mexico |  |
Income Taxes |  |
Mexican royalty | $ 58.0 | $ 47.4

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