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INCOME TAXES : (Tables)

3 Months Ended

Mar. 31, 2016

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 2016 and 2015 consisted of ($ in millions):

		2016			2015
Statutory income tax provision		$	82.6		$	111.2
Peruvian royalty		—			0.5
Mexican royalty		9.3			13.7
Peruvian special mining tax		0.4			3.8
Income tax provision		$	92.3		$	129.2
Effective income tax rate		33.8		%	31.5		%

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

Year		Income Tax Rate		Dividend Tax Rate
2015- 2016		28	%	6.8	%
2017- 2018		27	%	8.0	%
2019 and later		26	%	9.3	%

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