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SEGMENT AND RELATED INFORMATION: (Details 4) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013
Provisionally priced sales |  |
Provisional price sales adjustment amounts included in net sales | $ (26.1)scco_ProvisionalPriceSalesAdjustmentInNetSales | $ 1.6 scco_ProvisionalPriceSalesAdjustmentInNetSales
Copper |  |
Provisionally priced sales |  |
Provisional price sales adjustment amounts included in accounts receivable | (9.6)scco_ProvisionalPriceSalesAdjustmentsInAccountsReceivable / us-gaap_ProductOrServiceAxis = scco_CopperMember | 1.0 scco_ProvisionalPriceSalesAdjustmentsInAccountsReceivable / us-gaap_ProductOrServiceAxis = scco_CopperMember
Copper | January through April 2015 |  |
Provisionally priced sales |  |
Nonmonetary notional amount of commodity (in million lbs.) | 70,400,000 scco_NonmonetaryNotionalAmountOfProvisionallyPricedSalesAgreements / us-gaap_ProductOrServiceAxis = scco_CopperMember / scco_SettlementMonthAxis = scco_SettlementInJanuaryThroughApril2015Member |
Provisional price | 2.873 scco_ProvisionalPriceOfSalesAgreementsPerUnit / us-gaap_ProductOrServiceAxis = scco_CopperMember / scco_SettlementMonthAxis = scco_SettlementInJanuaryThroughApril2015Member |
Molybdenum |  |
Provisionally priced sales |  |
Provisional price sales adjustment amounts included in accounts receivable | $ (16.5)scco_ProvisionalPriceSalesAdjustmentsInAccountsReceivable / us-gaap_ProductOrServiceAxis = scco_MolybdenumMember | $ 0.6 scco_ProvisionalPriceSalesAdjustmentsInAccountsReceivable / us-gaap_ProductOrServiceAxis = scco_MolybdenumMember
Molybdenum | January through March 2015 |  |
Provisionally priced sales |  |
Nonmonetary notional amount of commodity (in million lbs.) | 11,700,000 scco_NonmonetaryNotionalAmountOfProvisionallyPricedSalesAgreements / us-gaap_ProductOrServiceAxis = scco_MolybdenumMember / scco_SettlementMonthAxis = scco_SettlementInJanuaryThroughMarch2015Member |
Provisional price | 9.00 scco_ProvisionalPriceOfSalesAgreementsPerUnit / us-gaap_ProductOrServiceAxis = scco_MolybdenumMember / scco_SettlementMonthAxis = scco_SettlementInJanuaryThroughMarch2015Member |

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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: | num:massItemType
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

X
- 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

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- Details
Name: | us-gaap_ProductOrServiceAxis=scco_CopperMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ProductOrServiceAxis=scco_MolybdenumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |