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INCOME TAXES: (Tables)

3 Months Ended

Mar. 31, 2017

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 2017 and 2016 consisted of ($ in millions):

		2017			2016
Statutory income tax provision		$	148.5		$	82.6
Peruvian royalty		0.4			—
Mexican royalty		21.4			9.3
Peruvian special mining tax		5.9			0.4
Income tax provision		$	176.2		$	92.3
Effective income tax rate		36.3		%	33.8		%

Summary of income tax rate and dividend tax rate due to change in enacted tax law

Year		Income Tax Rate		Dividend Tax Rate
2016		28.0	%	6.8	%
2017 and later		29.5	%	5	%

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

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