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INCOME TAXES: (Tables)

3 Months Ended

Mar. 31, 2019

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 2019 and 2018 consisted of ($ in millions):

		2019			2018
Statutory income tax provision		$	214.7		$	212.3
Peruvian royalty			0.4			1.7
Mexican royalty			16.7			16.1
Peruvian special mining tax			6.1			6.5
Income tax provision		$	237.9		$	236.6
Effective income tax rate			38.1	%		33.6	%

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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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