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SEGMENT AND RELATED INFORMATION: (Details 4) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Provisionally priced sales
Provisional price sales adjustment amounts included in net sales	$ (26.1)scco_ProvisionalPriceSalesAdjustmentInNetSales	$ 1.6scco_ProvisionalPriceSalesAdjustmentInNetSales
Copper
Provisionally priced sales
Provisional price sales adjustment amounts included in accounts receivable	(9.6)scco_ProvisionalPriceSalesAdjustmentsInAccountsReceivable / us-gaap_ProductOrServiceAxis = scco_CopperMember	1.0scco_ProvisionalPriceSalesAdjustmentsInAccountsReceivable / us-gaap_ProductOrServiceAxis = scco_CopperMember
Copper | January through April 2015
Provisionally priced sales
Nonmonetary notional amount of commodity (in million lbs.)	70,400,000scco_NonmonetaryNotionalAmountOfProvisionallyPricedSalesAgreements / us-gaap_ProductOrServiceAxis = scco_CopperMember / scco_SettlementMonthAxis = scco_SettlementInJanuaryThroughApril2015Member
Provisional price	2.873scco_ProvisionalPriceOfSalesAgreementsPerUnit / us-gaap_ProductOrServiceAxis = scco_CopperMember / scco_SettlementMonthAxis = scco_SettlementInJanuaryThroughApril2015Member
Molybdenum
Provisionally priced sales
Provisional price sales adjustment amounts included in accounts receivable	$ (16.5)scco_ProvisionalPriceSalesAdjustmentsInAccountsReceivable / us-gaap_ProductOrServiceAxis = scco_MolybdenumMember	$ 0.6scco_ProvisionalPriceSalesAdjustmentsInAccountsReceivable / us-gaap_ProductOrServiceAxis = scco_MolybdenumMember
Molybdenum | January through March 2015
Provisionally priced sales
Nonmonetary notional amount of commodity (in million lbs.)	11,700,000scco_NonmonetaryNotionalAmountOfProvisionallyPricedSalesAgreements / us-gaap_ProductOrServiceAxis = scco_MolybdenumMember / scco_SettlementMonthAxis = scco_SettlementInJanuaryThroughMarch2015Member
Provisional price	9.00scco_ProvisionalPriceOfSalesAgreementsPerUnit / us-gaap_ProductOrServiceAxis = scco_MolybdenumMember / scco_SettlementMonthAxis = scco_SettlementInJanuaryThroughMarch2015Member

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

- Details

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

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

- Details

Name:	us-gaap_ProductOrServiceAxis=scco_CopperMember
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: