INCOME TAXES : (Tables)

9 Months Ended

Sep. 30, 2015

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 2015 and 2014 consisted of ($ in millions):

	2015			2014
Statutory income tax provision	$	366.8		$	505.5
Peruvian royalty	3.0			6.6
Mexican royalty	22.8			64.9
Peruvian special mining tax	19.0			28.3
Income tax provision	$	411.6		$	605.3
Effective income tax rate	38.1		%	38.4		%

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	%