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INCOME TAXES: (Tables) | 3 Months Ended
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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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- Definition Disclosure of the income tax provision attributable to continuing operations and the effective income tax rate. + References No definition available. + Details
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- Definition Tabular disclosure of income tax rates and dividend tax rates for various periods. + References No definition available. + Details
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