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Metal and Other Inventories (Tables)
 6 Months Ended
Jun. 30, 2011
Metal and Other Inventories (Tables) [Abstract]  
Inventories
                 
    June 30,     December 31,  
    2011     2010  
Concentrate and doré inventory
  $ 103,642     $ 81,059  
Supplies
    51,998       37,281  
 
           
Metal and other inventory
  $ 155,640     $ 118,340