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v3.19.1

INCOME TAXES: (Tables) | 3 Months Ended
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Mar. 31, 2019
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 2019 and 2018 consisted of ($ in millions):
|  | 2019 |  | 2018 |
Statutory income tax provision |  | $ | 214.7 |  | $ | 212.3 |
Peruvian royalty |  |  | 0.4 |  |  | 1.7 |
Mexican royalty |  |  | 16.7 |  |  | 16.1 |
Peruvian special mining tax |  |  | 6.1 |  |  | 6.5 |
Income tax provision |  | $ | 237.9 |  | $ | 236.6 |
Effective income tax rate |  |  | 38.1 | % |  | 33.6 | %

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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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