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Metal and Other Inventories (Tables)
12 Months Ended
Dec. 31, 2011
Metal and Other Inventory [Abstract]  
Inventories
                 
    December 31,
2011
    December 31,
2010
 

Concentrate and doré inventory

  $ 73,590     $ 81,059  

Supplies

    59,191       37,281  
   

 

 

   

 

 

 

Metal and other inventory

  $ 132,781     $ 118,340