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INCOME TAXES: (Tables)

3 Months Ended

Mar. 31, 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 first quarter 2018 and 2017 consisted of ($ in millions):

		2018			2017
Statutory income tax provision		$	212.3		$	148.5
Peruvian royalty		1.7			0.4
Mexican royalty		16.1			21.4
Peruvian special mining tax		6.5			5.9
Income tax provision		$	236.6		$	176.2
Effective income tax rate		33.6		%	36.3		%

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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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