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INCOME TAXES: (Tables)
9 Months Ended
Sep. 30, 2023
INCOME TAXES:  
Schedule of income tax provision and effective income tax rate

The income tax provision and the effective income tax rate for the nine-month periods ended September 30, 2023 and 2022 consisted of (in millions):

    

2023

    

2022

Statutory income tax provision

$

985.8

$

972.7

Peruvian royalty

 

30.2

 

24.7

Mexican royalty

 

102.5

 

97.9

Peruvian special mining tax

 

51.7

 

41.7

Total income tax provision

$

1,170.2

$

1,137.0

Effective income tax rate

36.9

%

39.5

%