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Note 4. Environmental and Reclamation Activities (Detail) (USD $) | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Oct. 31, 2011 | Jun. 30, 2011 | Mar. 31, 2010 | Jan. 31, 2010 | Dec. 31, 2009 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Increase Decrease In Accrued Reclamation |  |  |  |  |  |  | $ 193,200,000 |  |  |
Liabilities Subject to Compromise, Provision for Expected and Allowed Claims |  |  |  |  |  |  | 262,200,000 |  | 262,200,000 |
Other Accrued Liabilities |  |  |  |  |  |  | 264,400,000 |  | 264,400,000 |
Payments for Legal Settlements | 168,000,000 |  |  |  |  | 1 |  |  |  |
Surety Bonds | 96,400,000 |  |  |  |  |  | 96,400,000 |  | 96,400,000 |
Remaining Payment Obligation |  |  |  |  |  | 95,400,000 |  | 95,400,000 |  |
Incurred Response Costs |  |  | 5,300,000 | 91,000,000 |  |  |  |  |  |
Estimated Response Costs |  | 4,500,000 | 2.7 |  |  |  |  |  |  |
Proceeds from Other Debt |  |  |  |  | 3,300,000 |  |  |  |  |
|  |  |  |  |  |  |  | (172,855,000) | (8,666,000) | 1,540,000
Increase (Decrease) in Accounts Receivable |  |  |  |  |  |  |  | (16,531,000) | 9,404,000 | 18,117,000
Accrued Reclamation And Closure Costs Total |  |  |  |  | 131,201,000 | 153,811,000 | 318,797,000 | 153,811,000 | 318,797,000 | 131,201,000
ASARCO Claim Amount [Member] |  |  |  |  |  |  |  |  |  |
|  |  |  |  | 3,200,000 |  |  |  |  |
Maximum Potentail Liability [Member] |  |  |  |  |  |  |  |  |  |
Estimated Response Costs |  |  | 6,800,000 |  |  |  |  |  |  |
ASARCO Claim Amount [Member] |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Accounts Receivable |  |  |  |  | 100,000 |  |  |  |  |
Minimum Risk Free Interest Rate [Member] |  |  |  |  |  |  |  |  |  |
Risk Free Interest Rate |  |  |  |  |  |  | 6.00% |  | 6.00% |
Maximum Risk Free Interst Rate [Member] |  |  |  |  |  |  |  |  |  |
Risk Free Interest Rate |  |  |  |  |  |  | 7.00% |  | 7.00% |
Minimum Potentail Liability [Member] |  |  |  |  |  |  |  |  |  |
Estimated Response Costs |  |  | $ 2.7 |  |  |  |  |  |  |

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