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Significant Accouting Policies - Additional Information (Detail) | 12 Months Ended
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Dec. 31, 2011
Minimum likelihood for the realization in order to recognize tax benefit from uncertain tax positions | 50.00%
Leach pad production cycles project recoveries, minimum percentage of the placed recoverable ounces in the first year of leaching | 50.00%
Leach pad production cycles project recoveries, maximum percentage of the placed recoverable ounces in the first year of leaching | 70.00%
Contracts for sales of copper concentrate provisional price, final adjustment period, minimum number of days after delivery | 30 days
Contracts for sales of copper concentrate provisional price, final adjustment period, maximum number of days after delivery | 90 days

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- Definition Percentage Of Income Tax Examination Minimum Likelihood of Tax Benefits Being Realized Upon Settlement + References No definition available. + Details
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