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PROVISIONALLY PRICED SALES: (Details)	Sep. 30, 2012 priceperunit lbs
Copper
Provisionally priced sales
Nonmonetary notional amount of commodity (in million lbs.)	14,500,000
Provisional price	3.727
Copper | October 2012
Provisionally priced sales
Nonmonetary notional amount of commodity (in million lbs.)	11,200,000
Provisional price	3.727
Copper | November 2012
Provisionally priced sales
Nonmonetary notional amount of commodity (in million lbs.)	3,300,000
Provisional price	3.724
Molybdenum
Provisionally priced sales
Nonmonetary notional amount of commodity (in million lbs.)	8,700,000
Provisional price	11.65
Molybdenum | October 2012
Provisionally priced sales
Nonmonetary notional amount of commodity (in million lbs.)	3,300,000
Provisional price	11.65
Molybdenum | November 2012
Provisionally priced sales
Nonmonetary notional amount of commodity (in million lbs.)	3,100,000
Provisional price	11.65
Molybdenum | December 2012
Provisionally priced sales
Nonmonetary notional amount of commodity (in million lbs.)	2,300,000
Provisional price	11.65

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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X

- Details

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