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INCOME TAXES: (Tables) | 9 Months Ended
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Sep. 30, 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 nine months of 2016 and 2015 consisted of ($ in millions):
|  | 2016 |  | 2015 |
Statutory income tax provision |  | $ | 268.5 |  | $ | 366.8 |
Peruvian royalty |  | — |  | 3.0 |
Mexican royalty |  | 29.4 |  | 22.8 |
Peruvian special mining tax |  | 7.5 |  | 19.0 |
Income tax provision |  | $ | 305.4 |  | $ | 411.6 |
Effective income tax rate |  | 34.1 | % | 38.1 | %
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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