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INCOME TAXES: (Tables) | 6 Months Ended
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Jun. 30, 2014
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 2014 and 2013 were as follows ($ in millions):
|  | 2014 |  | 2013 |
Income tax provision |  | $ | 429.9 |  | $ | 406.8 |
Effective income tax rate |  | 39.8 | % | 32.2 | %
Schedule of components of the income tax provision | Components of the income tax provision for the six month periods of 2014 and 2013 include the following ($ in millions):
|  | 2014 |  | 2013 |
Statutory income tax provision |  | $ | 361.6 |  | $ | 380.7 |
Peruvian royalty |  | 2.1 |  | 5.0 |
Mexican royalty |  | 46.6 |  | — |
Peruvian special mining tax |  | 19.6 |  | 21.1 |
Total income tax provision |  | $ | 429.9 |  | $ | 406.8 |

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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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- Definition Tabular disclosure of the components of income tax expense attributable to continuing operations for each year presented including, but not limited to: current tax expense (benefit), deferred tax expense (benefit), investment tax credits, government grants, the benefits of operating loss carryforwards, tax expense that results from allocating certain tax benefits either directly to contributed capital or to reduce goodwill or other noncurrent intangible assets of an acquired entity, adjustments of a deferred tax liability or asset for enacted changes in tax laws or rates or a change in the tax status of the entity, and adjustments of the beginning-of-the-year balances of a valuation allowance because of a change in circumstances that causes a change in judgment about the realizability of the related deferred tax asset in future years. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319 + Details
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