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SEGMENT AND RELATED INFORMATION: (Details 4) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011
Provisionally priced sales |  |
Provisional price sales adjustment amounts included in accounts receivable | $ 6.6 | $ (2.0)
Provisional price sales adjustment amounts included in net sales | 6.6 | (2.0)
Copper |  |
Provisionally priced sales |  |
Nonmonetary notional amount of commodity (in million lbs.) | 19,700,000 |
Provisional price | 3.59 |
Provisional price sales adjustment amounts included in accounts receivable | 2.9 | 1.4
Provisional price sales adjustment amounts included in net sales | 2.9 | 1.4
Copper | January 2013 |  |
Provisionally priced sales |  |
Nonmonetary notional amount of commodity (in million lbs.) | 19,700,000 |
Provisional price | 3.59 |
Molybdenum |  |
Provisionally priced sales |  |
Nonmonetary notional amount of commodity (in million lbs.) | 8,800,000 |
Provisional price | 11.60 |
Provisional price sales adjustment amounts included in accounts receivable | 3.7 | (3.4)
Provisional price sales adjustment amounts included in net sales | $ 3.7 | $ (3.4)
Molybdenum | January 2013 |  |
Provisionally priced sales |  |
Nonmonetary notional amount of commodity (in million lbs.) | 3,000,000 |
Provisional price | 11.60 |
Molybdenum | February 2013 |  |
Provisionally priced sales |  |
Nonmonetary notional amount of commodity (in million lbs.) | 3,100,000 |
Provisional price | 11.60 |
Molybdenum | March 2013 |  |
Provisionally priced sales |  |
Nonmonetary notional amount of commodity (in million lbs.) | 2,600,000 |
Provisional price | 11.60 |
Molybdenum | April 2013 |  |
Provisionally priced sales |  |
Nonmonetary notional amount of commodity (in million lbs.) | 100,000 |
Provisional price | 11.60 |

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- Definition Aggregate notional amount of provisionally priced sales agreements with notional amounts expressed in nonmonetary units. + References No definition available. + Details
Name: | scco_NonmonetaryNotionalAmountOfProvisionallyPricedSalesAgreements
Namespace Prefix: | scco_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Details
Name: | scco_ProvisionallyPricedSalesLineItems
Namespace Prefix: | scco_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The per unit price of provisionally priced sales agreements. + References No definition available. + Details
Name: | scco_ProvisionalPriceOfSalesAgreementsPerUnit
Namespace Prefix: | scco_
Data Type: | us-types:perUnitItemType
Balance Type: | na
Period Type: | instant

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- Definition Represents the provisional sales price adjustment amounts included in net sales. + References No definition available. + Details
Name: | scco_ProvisionalPriceSalesAdjustmentInNetSales
Namespace Prefix: | scco_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Represents the provisional sales price adjustment amounts included in accounts receivable. + References No definition available. + Details
Name: | scco_ProvisionalPriceSalesAdjustmentsInAccountsReceivable
Namespace Prefix: | scco_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant