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SHORT-TERM INVESTMENTS: (Details) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013
Investments |  |
Trading Securities, Debt | $ 333,700,000 us-gaap_TradingSecuritiesDebt | $ 202,600,000 us-gaap_TradingSecuritiesDebt
Weighted average interest rate (as a percent) | 0.78%scco_TradingSecuritiesWeightedAverageInterestRate | 3.78%scco_TradingSecuritiesWeightedAverageInterestRate
Available for sale | 4,900,000 us-gaap_AvailableForSaleSecuritiesCurrent | 5,700,000 us-gaap_AvailableForSaleSecuritiesCurrent
Weighted average interest rate (as a percent) | 0.44%scco_AvailableForSaleSecuritiesWeightedAverageInterestRate | 0.42%scco_AvailableForSaleSecuritiesWeightedAverageInterestRate
Total short-term investments | 338,589,000 us-gaap_ShortTermInvestments | 208,268,000 us-gaap_ShortTermInvestments
Trading: |  |
Interest earned | 4,900,000 us-gaap_InterestAndDividendIncomeSecuritiesTradingOrMeasuredAtFairValue | 5,200,000 us-gaap_InterestAndDividendIncomeSecuritiesTradingOrMeasuredAtFairValue
Unrealized gain (loss) at the end of the period | 2,100,000 us-gaap_TradingSecuritiesUnrealizedHoldingLoss | (1,900,000)us-gaap_TradingSecuritiesUnrealizedHoldingLoss
Available-for-sale |  |
Investment redeemed | 800,000 us-gaap_ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities | 800,000 us-gaap_ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities
Contractual maturities of the Company's available for sale debt securities |  |
One year or less | 300,000 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue | 400,000 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue
Maturing after five years through ten years | 100,000 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue | 200,000 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue
Due after 10 years | 4,500,000 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue | 5,100,000 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue
Total debt securities | 4,900,000 us-gaap_AvailableForSaleSecuritiesDebtSecurities | 5,700,000 us-gaap_AvailableForSaleSecuritiesDebtSecurities
Maximum |  |
Available-for-sale |  |
Interest earned | $ 100,000 us-gaap_InterestAndDividendIncomeSecuritiesAvailableForSale / us-gaap_RangeAxis = us-gaap_MaximumMember | $ 100,000 us-gaap_InterestAndDividendIncomeSecuritiesAvailableForSale / us-gaap_RangeAxis = us-gaap_MaximumMember

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- Definition Represents the weighted average interest rate on debt and equity securities which are categorized neither as trading securities nor as held-to-maturity securities and that are intended be sold or will mature within one year from the balance sheet date or the normal operating cycle, whichever is longer. + References No definition available. + Details
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- Definition Amount of investment in debt and equity securities categorized neither as trading securities nor held-to-maturity securities and intended be sold or mature one year or operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26626-111562 + Details
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