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WORKERS' PARTICIPATION: (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Statutory workers' participation
Current	$ 221.2scco_StatutoryWorkersParticipationWorkersParticipationExpensesCurrent	$ 201.6scco_StatutoryWorkersParticipationWorkersParticipationExpensesCurrent	$ 263.1scco_StatutoryWorkersParticipationWorkersParticipationExpensesCurrent
Deferred	(11.4)scco_StatutoryWorkersParticipationWorkersParticipationExpensesDeferred	31.4scco_StatutoryWorkersParticipationWorkersParticipationExpensesDeferred	14.3scco_StatutoryWorkersParticipationWorkersParticipationExpensesDeferred
Workers' participation expense (in USD)	209.8scco_StatutoryWorkersParticipationWorkersParticipationExpenses	233.0scco_StatutoryWorkersParticipationWorkersParticipationExpenses	277.4scco_StatutoryWorkersParticipationWorkersParticipationExpenses
Peru
Statutory workers' participation
Provision for workers' participation as a percentage of pre-tax earnings	8.00%scco_StatutoryWorkersParticipationProvisionForWorkersParticipationAsPercentageOfEarningsBeforeTax / us-gaap_StatementGeographicalAxis = country_PE
Number of months for which an individual worker's salary is capped for consideration of annual individual worker participation	18 months
Maximum taxable units contributed by employer to benefit fund (in Peruvian taxable units)	2,200scco_StatutoryWorkersParticipationMaximumTaxableUnitsContributedByEmployerToBenefitFund / us-gaap_StatementGeographicalAxis = country_PE
Maximum employer contribution to benefit fund (in USD)	2.8scco_StatutoryWorkersParticipationMaximumContributedByEmployerToBenefitFund / us-gaap_StatementGeographicalAxis = country_PE
Mexico
Statutory workers' participation
Provision for workers' participation as a percentage of pre-tax earnings	10.00%scco_StatutoryWorkersParticipationProvisionForWorkersParticipationAsPercentageOfEarningsBeforeTax / us-gaap_StatementGeographicalAxis = country_MX
Deferred workers participation provision	$ 16.3scco_StatutoryWorkersParticipationProvisionForWorkersParticipation / us-gaap_StatementGeographicalAxis = country_MX

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- Details

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- Definition

Represents the maximum employer contribution to benefit fund.

+ References

No definition available.

+ Details

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X

- Definition

Represents the maximum taxable units contributed by employer to benefit fund.

+ References

No definition available.

+ Details

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X

- Definition

Represents the number of periods for which an individual worker's salary is capped for determining the maximum annual amount payable as worker's participation to each individual worker.

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No definition available.

+ Details

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Data Type:	xbrli:durationItemType
Balance Type:	na
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X

- Definition

Represents the provision for workers' participation.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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- Definition

Represents the provision for workers' participation as a percentage of pre-tax earnings.

+ References

No definition available.

+ Details

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Namespace Prefix:	scco_
Data Type:	num:percentItemType
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X

- Definition

Represents the workers' participation expenses incurred by the entity during the period.

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No definition available.

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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- Definition

Represents the current workers' participation expenses incurred by the entity during the period.

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No definition available.

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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- Definition

Represents the deferred workers' participation expenses incurred by the entity during the period.

+ References

No definition available.

+ Details

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Namespace Prefix:	scco_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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- Details

Name:	us-gaap_StatementGeographicalAxis=country_MX
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Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_StatementGeographicalAxis=country_PE
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Data Type:	na
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Period Type: