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SEGMENT AND RELATED INFORMATION: - Provisional Sale (Details) lb in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($) lb $ / lb
Provisionally priced sales:
Provisional price sales adjustment amounts included in net sales	$ 10.0	$ (22.9)
Copper
Provisionally priced sales:
Provisional price sales adjustment amounts included in accounts receivable	7.6	$ (8.3)
Copper | January through March 2019
Provisionally priced sales:
Sales volume (in million lbs.) | lb		102.4
Provisional price | $ / lb		2.68
Molybdenum
Provisionally priced sales:
Provisional price sales adjustment amounts included in accounts receivable	$ 2.4	$ (14.6)
Molybdenum | January through March 2019
Provisionally priced sales:
Sales volume (in million lbs.) | lb		9.0
Provisional price | $ / lb		11.88

X

- 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

X

- 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

X

- 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

X

- 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

X

- Details

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

X

- Details

Name:	scco_SettlementMonthAxis=scco_SettlementInJanuaryThroughMarch2019Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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