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INCOME TAXES: (Details) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
U.S. federal and state:      
Current     $ (100,000)scco_CurrentFederalAndStateTaxExpenseBenefit
Deferred (194,100,000)scco_DeferredFederalAndStateIncomeTaxExpenseBenefit (139,300,000)scco_DeferredFederalAndStateIncomeTaxExpenseBenefit (108,600,000)scco_DeferredFederalAndStateIncomeTaxExpenseBenefit
Uncertain tax positions 10,700,000scco_UncertainTaxPositions   147,400,000scco_UncertainTaxPositions
Provision for income taxes (183,400,000)scco_FederalAndStateIncomeTaxExpenseBenefitContinuingOperations (139,300,000)scco_FederalAndStateIncomeTaxExpenseBenefitContinuingOperations 38,700,000scco_FederalAndStateIncomeTaxExpenseBenefitContinuingOperations
Foreign (Peru and Mexico):      
Current 987,100,000us-gaap_CurrentForeignTaxExpenseBenefit 866,300,000us-gaap_CurrentForeignTaxExpenseBenefit 1,025,100,000us-gaap_CurrentForeignTaxExpenseBenefit
Deferred (49,100,000)us-gaap_DeferredForeignIncomeTaxExpenseBenefit 42,300,000us-gaap_DeferredForeignIncomeTaxExpenseBenefit 17,100,000us-gaap_DeferredForeignIncomeTaxExpenseBenefit
Provision for income taxes 938,000,000us-gaap_ForeignIncomeTaxExpenseBenefitContinuingOperations 908,600,000us-gaap_ForeignIncomeTaxExpenseBenefitContinuingOperations 1,042,200,000us-gaap_ForeignIncomeTaxExpenseBenefitContinuingOperations
Income Tax Expense (Benefit), Total 754,629,000us-gaap_IncomeTaxExpenseBenefit 769,322,000us-gaap_IncomeTaxExpenseBenefit 1,080,872,000us-gaap_IncomeTaxExpenseBenefit
Earnings by location:      
U.S. (1,700,000)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic 100,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic (100,000)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic
Peru 605,800,000scco_IncomeLossFromContinuingOperationsBeforeIncomeTaxesPeru 773,800,000scco_IncomeLossFromContinuingOperationsBeforeIncomeTaxesPeru 846,000,000scco_IncomeLossFromContinuingOperationsBeforeIncomeTaxesPeru
Mexico 1,464,600,000scco_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMexico 1,598,700,000scco_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMexico 2,127,600,000scco_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMexico
Foreign 2,070,400,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign 2,372,500,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign 2,973,600,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign
Income before income taxes $ 2,068,706,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments $ 2,372,598,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments $ 2,973,542,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments