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INCOME TAXES: (Details 2) (Peru, USD $) In Millions, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 31, 2013 | Mar. 31, 2012
Income Taxes |  |
Operating income margin (as a percent) | 10.00% |
Increase in special mining tax rate for each 5% increase up to 85% increase in operating income margin (as a percent) | 0.40% |
Provision for special mining tax | $ 15.5 | $ 11.9
Minimum |  |
Income Taxes |  |
Special mine tax (as a percent) | 2.00% |
Increment in operating income margin (as a percent) | 5.00% |
Maximum |  |
Income Taxes |  |
Special mine tax (as a percent) | 8.40% |
Increment in operating income margin (as a percent) | 85.00% |

X
- Details
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Data Type: | xbrli:stringItemType
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- Definition Represents the increase over the threshold percentage of operating income margin. + References No definition available. + Details
Name: | scco_OperatingIncomeMarginIncreaseOverThresholdPercentage
Namespace Prefix: | scco_
Data Type: | num:percentItemType
Balance Type: | na
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- Definition Represents the threshold percentage of operating income margin for determining special mining tax. + References No definition available. + Details
Name: | scco_OperatingIncomeMarginThresholdPercentage
Namespace Prefix: | scco_
Data Type: | num:percentItemType
Balance Type: | na
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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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Data Type: | num:percentItemType
Balance Type: | na
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- Definition Represents the percentage of special mining tax based on operating income margins. + References No definition available. + Details
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Namespace Prefix: | scco_
Data Type: | num:percentItemType
Balance Type: | na
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- Definition Represents the special mining tax based on operating income. + References No definition available. + Details
Name: | scco_SpecialMiningTax
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration