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SEGMENT AND RELATED INFORMATION: - Provisional Sale (Details) lb in Millions | 12 Months Ended
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Dec. 31, 2020 USD ($) lb | Dec. 31, 2019 USD ($)
Provisionally priced sales: |  |
Provisional price sales adjustment amounts included in net sales | $ (31,500,000) | $ 4,200,000
Copper |  |
Provisionally priced sales: |  |
Provisional price sales adjustment amounts included in accounts receivable | $ (17,400,000) | (4,000,000.0)
Copper | January through April 2021 |  |
Provisionally priced sales: |  |
Sales volume (in million lbs.) | lb | 139.8 |
Provisional price | $ 3.52 |
Molybdenum |  |
Provisionally priced sales: |  |
Provisional price sales adjustment amounts included in accounts receivable | $ (14,100,000) | $ 8,200,000
Molybdenum | January through March 2021 |  |
Provisionally priced sales: |  |
Sales volume (in million lbs.) | lb | 12.9 |
Provisional price | $ 10.03 |

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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: | xbrli:monetaryItemType
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

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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: | srt_ProductOrServiceAxis=scco_CopperMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | scco_SettlementMonthAxis=scco_SettlementInJanuaryThroughApril2021Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_ProductOrServiceAxis=scco_MolybdenumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | scco_SettlementMonthAxis=scco_SettlementInJanuaryThroughMarch2021Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |