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INCOME TAXES: (Tables)

9 Months Ended

Sep. 30, 2019

INCOME TAXES:

Schedule of income tax provision and effective income tax rate

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The income tax provision and the effective income tax rate for the nine months of 2019 and 2018 consisted of ($ in millions):

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​	​	​	​	​	​	​	​
​		2019			2018		​
Statutory income tax provision	​	$	648.0	​	$	698.5	​
GILTI Tax	​	​	—	​	​	15.2	​
Peruvian royalty	​		8.6	​		6.7	​
Mexican royalty	​		47.6	​		60.9	​
Peruvian special mining tax	​		25.8	​		22.3	​
Total income tax provision	​	$	730.0	​	$	803.6	​
​	​	​	​	​	​	​	​
Effective income tax rate	​	​	38.2	%	​	39.2	%

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- Definition

Disclosure of the income tax provision attributable to continuing operations and the effective income tax rate.

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