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REVENUE RECOGNITION: - Provisionally prices sales (Details) lb in Millions, $ in Millions | Sep. 30, 2018 USD ($) lb $ / item
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Copper |
Provisionally priced sales: |
Provisional price sales adjustment amounts included in accounts receivable and net sales | $ | $ 2.0
Copper | October 2018 to January 2019 |
Provisionally priced sales: |
Sales volume (in million lbs.) | lb | 51.3
Provisional price | $ / item | 2.80
Molybdenum |
Provisionally priced sales: |
Provisional price sales adjustment amounts included in accounts receivable and net sales | $ | $ 0.3
Molybdenum | October 2018 to December 2018 |
Provisionally priced sales: |
Sales volume (in million lbs.) | lb | 11.4
Provisional price | $ / item | 11.80

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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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- 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 accounts receivable and net sales. + References No definition available. + Details
Name: | scco_ProvisionalPriceSalesAdjustmentsInAccountsReceivableAndNetSales
Namespace Prefix: | scco_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Represents the provisionally priced sales. + References No definition available. + Details
Name: | scco_ProvisionallyPricedSalesLineItems
Namespace Prefix: | scco_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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

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- Details
Name: | scco_SettlementMonthAxis=scco_October2018ToJanuary2019Member
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: |

X
- Details
Name: | scco_SettlementMonthAxis=scco_October2018ToDecember2018Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |