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INCOME TAXES: (Tables) | 3 Months Ended
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Mar. 31, 2018
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 2018 and 2017 consisted of ($ in millions):
|  | 2018 |  | 2017 |
Statutory income tax provision |  | $ | 212.3 |  | $ | 148.5 |
Peruvian royalty |  | 1.7 |  | 0.4 |
Mexican royalty |  | 16.1 |  | 21.4 |
Peruvian special mining tax |  | 6.5 |  | 5.9 |
Income tax provision |  | $ | 236.6 |  | $ | 176.2 |
Effective income tax rate |  | 33.6 | % | 36.3 | %

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