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Discontinued Operations (Tables)
6 Months Ended
Jun. 30, 2011
Discontinued Operations (Tables) [Abstract]  
Financial information included in the income from discontinued operations
                 
    Three months     Six months  
    ended     ended  
    June 30, 2010     June 30, 2010  
Sales of metals
  $     $  
 
               
Depreciation and depletion
    (1,028 )     (2,082 )
Care and maintenance expense
    (809 )     (1,878 )
Other income and expense
    (151 )     (497 )
Income tax expense
    (978 )     (1,321 )
Loss on sale of discontinued assets
    (2,977 )     (2,977 )
 
           
Income (loss) from discontinued operations
  $ (5,943 )   $ (8,755 )