v3.26.1
INCOME TAXES: (Tables)
6 Months Ended
Jun. 30, 2026
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 periods ended June 30, 2026 and 2025 consisted of (in millions):

  ​ ​ ​

2026

  ​ ​ ​

2025

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

36.4

%

36.7

%