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INCOME TAXES: (Details) € in Millions, $ in Millions | 6 Months Ended
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Jun. 30, 2026 USD ($) | Jun. 30, 2026 EUR (€) | Jun. 30, 2025 USD ($)
INCOME TAXES |  |  |
Statutory income tax provision | $ 1,505.1 |  | $ 930.0
Peruvian royalty | 69.7 |  | 33.3
Mexican royalty | 175.2 |  | 94.7
Peruvian special mining tax | 86.3 |  | 50.7
Total income tax provision | $ 1,836.3 |  | $ 1,108.7
Effective income tax rate (as a percent) | 36.40% | 36.40% | 36.70%
Threshold minimum aggregate revenue under pillar two tax rules | € |  | € 750 |
Global minimum tax rate | 15.00% | 15.00% |
Peru |  |  |
INCOME TAXES |  |  |
Royalty charges | $ 156.0 |  | $ 84.0
Increase (decrease) in income tax expense (benefit) | 15.4 |  |
Unrecognized Tax Benefits | 24.7 |  |
Mexico |  |  |
INCOME TAXES |  |  |
Mexican royalty | $ 175.2 |  | $ 94.7

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