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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, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Balance | $ 153,811 | $ 318,797 | $ 131,201
Accruals for estimated costs | 4,325 | 7,869 | 196,067
Revision of estimated cash flows due to changes in reclamation plans | (3,738) |  |
Payment of reclamation obligations | (41,183) | (172,855) | (8,471)
Balance | $ 113,215 | $ 153,811 | $ 318,797

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