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Note 4. Environmental and Reclamation Activities (Detail) - Accrued Reclamation and Closure Cost Liability Activity (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Accruals for estimated costs | $ 7,869 | $ 196,067 | $ 5,980
Revision of estimated cash flows due to changes in reclamation plans |  |  | 3,347
Receipt of settlement payment for shared reclamation costs incurred |  |  | 3,150
Payment of reclamation obligations | (172,855) | (8,471) | (2,623)
Balance | 318,797 | 131,201 |
Balance | $ 153,811 | $ 318,797 | $ 131,201

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