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Inventories (Tables)
6 Months Ended
Jun. 30, 2011
Inventories  
Components of Inventories
                 
    June 30,     December 31,  
(in thousands)   2011     2010  
Metals inventory
               
Raw ore
  $ 1,313     $ 943  
Concentrate and in-process
    47,973       40,818  
Finished goods
    87,705       42,236  
 
           
 
    136,991       83,997  
Materials and supplies
    19,294       17,809  
 
           
Total inventory
  $ 156,285     $ 101,806