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INCOME TAXES: (Details) (USD $) | 3 Months Ended | 6 Months Ended | 1 Months Ended | 6 Months Ended
--- | --- | --- | --- | ---
Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 Peruvian operations | Jun. 30, 2013 Peruvian operations | Jun. 30, 2014 Peruvian operations Minimum | Jun. 30, 2014 Peruvian operations Maximum | Jan. 31, 2014 Mexican Operations | Jun. 30, 2014 Mexican Operations
INCOME TAXES: |  |  |  |  |  |  |  |  |  |
Income tax provision | $ 225,769,000 | $ 167,870,000 | $ 429,931,000 | $ 406,749,000 |  |  |  |  |  |
Effective income tax rate (as a percent) |  |  | 39.80% | 32.20% |  |  |  |  |  |
Increase in effective tax rate (as a percent) |  |  | 4.70% |  |  |  |  |  |  |
Components of the income tax provision |  |  |  |  |  |  |  |  |  |
Statutory income tax provision |  |  | 361,600,000 | 380,700,000 |  |  |  |  |  |
Royalty |  |  |  |  | 2,100,000 | 5,000,000 |  |  |  |
Special mining tax |  |  |  |  | 19,600,000 | 21,100,000 |  |  |  |
Total income tax provision | 225,769,000 | 167,870,000 | 429,931,000 | 406,749,000 |  |  |  |  |  |
Mining royalty tax (as a percent) |  |  |  |  |  |  | 1.00% | 12.00% | 7.50% |
Royalty charge assessed as a percentage of net sales |  |  |  |  |  |  | 1.00% |  |  |
Operating income margin for royalty tax (as a percent) |  |  |  |  |  |  |  | 10.00% |  |
Increment in operating income margin for royalty tax (as a percent) |  |  |  |  |  |  | 5.00% | 12.00% |  |
Increase in royalty tax rate for each 5% increase up to 12% increase in operating income margin (as a percent) |  |  |  |  | 0.75% |  |  |  |  |
Royalty charge |  |  |  |  | 14,400,000 | 17,700,000 |  |  |  |
Provision for royalty tax |  |  |  |  | 2,100,000 | 5,000,000 |  |  |  |
Provision for royalty tax |  |  |  |  |  |  |  |  |  | 46,600,000
Additional royalty tax over net sales from sales of gold, silver and platinum (as a percent) |  |  |  |  |  |  |  |  | 0.50% |
Special mine tax (as a percent) |  |  |  |  |  |  | 2.00% | 8.40% |  |
Operating income margin (as a percent) |  |  |  |  |  |  |  | 10.00% |  |
Increment in operating income margin (as a percent) |  |  |  |  |  |  | 5.00% | 85.00% |  |
Increase in special mining tax rate for each 5% increase up to 85% increase in operating income margin (as a percent) |  |  |  |  | 0.40% |  |  |  |  |
Accrued special mining tax |  |  |  |  | $ 19,600,000 | $ 21,000,000 |  |  |  |

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- Definition Represents the increase in special mining tax rate for each 5 percent increase up to 85 percent increase in the operating income margin. + References No definition available. + Details
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