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INCOME TAXES: (Tables) | 6 Months Ended
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Jun. 30, 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 six months of 2017 and 2016 consisted of ($ in millions):
|  | 2017 |  | 2016 |
Statutory income tax provision |  | $ | 289.1 |  | $ | 175.5 |
Peruvian royalty |  | 0.4 |  | — |
Mexican royalty |  | 32.3 |  | 13.7 |
Peruvian special mining tax |  | 14.8 |  | 5.0 |
Total income tax provision |  | $ | 336.6 |  | $ | 194.2 |
Effective income tax rate |  | 35.7 | % | 32.7 | %
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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