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INCOME TAXES : (Tables) | 6 Months Ended
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Jun. 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 first six months of 2016 and 2015 consisted of ($ in millions):
|  | 2016 |  | 2015 |
Statutory income tax provision |  | $ | 175.5 |  | $ | 249.8 |
Peruvian royalty |  | — |  | 2.9 |
Mexican royalty |  | 13.7 |  | 22.3 |
Peruvian special mining tax |  | 5.0 |  | 11.2 |
Total income tax provision |  | $ | 194.2 |  | $ | 286.2 |
Effective income tax rate |  | 32.7 | % | 33.3 | %
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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