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PROVISIONALLY PRICED SALES: (Details) lb in Millions, $ in Millions	Sep. 30, 2017 USD ($) lb $ / item
Copper
PROVISIONALLY PRICED SALES:
Provisional price sales adjustment amounts included in accounts receivable and net sales | $	$ 0.7
Copper | October 2017 to December 2017
PROVISIONALLY PRICED SALES:
Sales volume (in million lbs.) | lb	52.5
Provisional price | $ / item	2.94
Molybdenum
PROVISIONALLY PRICED SALES:
Provisional price sales adjustment amounts included in accounts receivable and net sales | $	$ 3.9
Molybdenum | October 2017 to December 2017
PROVISIONALLY PRICED SALES:
Sales volume (in million lbs.) | lb	10.6
Provisional price | $ / item	8.33

X

- Definition

Aggregate notional amount of provisionally priced sales agreements with notional amounts expressed in nonmonetary units.

+ References

No definition available.

+ Details

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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

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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 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

X

- References

No definition available.

+ Details

Name:	scco_ProvisionallyPricedSalesLineItems
Namespace Prefix:	scco_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

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

X

- Details

Name:	scco_SettlementMonthAxis=scco_October2017ToDecember2017Member
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: