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INCOME TAXES: (Tables) | 3 Months Ended
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Mar. 31, 2020
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 of 2020 and 2019 consisted of ($ in millions):
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2020 |  | 2019 | ​
Statutory income tax provision | ​ | $ | 207.4 | ​ | $ | 214.7 | ​
Peruvian royalty | ​ |  | 2.0 | ​ |  | 0.4 | ​
Mexican royalty | ​ |  | 8.1 | ​ |  | 16.7 | ​
Peruvian special mining tax | ​ |  | 4.2 | ​ |  | 6.1 | ​
Total income tax provision | ​ | $ | 221.7 | ​ | $ | 237.9 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Effective income tax rate | ​ | ​ | 50.8 | % | ​ | 38.1 | %

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