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INCOME TAXES: (Tables)
6 Months Ended
Jun. 30, 2024
INCOME TAXES:  
Schedule of income tax provision and effective income tax rate

The income tax provision and the effective income tax rate for the six-month period ended June 30, 2024 and 2023 consisted of (in millions):

    

2024

    

2023

Statutory income tax provision

$

852.3

$

649.2

Peruvian royalty

 

29.1

 

18.7

Mexican royalty

 

75.7

 

72.3

Peruvian special mining tax

 

45.0

 

34.7

Total income tax provision

$

1,002.1

$

774.9

Effective income tax rate

37.3

%

36.0

%