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INCOME TAXES: (Tables)

9 Months Ended

Sep. 30, 2018

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 months of 2018 and 2017 consisted of (in millions):

		2018			2017
Statutory income tax provision		$	698.5		$	473.0
GILTI tax		15.2			—
Peruvian royalty		6.7			0.5
Mexican royalty		60.9			67.7
Peruvian special mining tax		22.3			15.4
Total income tax provision		$	803.6		$	556.6
Effective income tax rate		39.2		%	35.7		%

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

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