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Reclamation and Mine Closure (Tables)
9 Months Ended
Sep. 30, 2011
Reclamation and Mine Closure [Abstract] 
Asset Retirement Obligation

 

                                 
    Three months ended
September 30,		     Nine months ended
September 30,		  
    2011     2010     2011     2010  

Asset retirement obligation - Beginning

   $ 28,557     $ 26,255     $ 27,302     $ 25,112  

Accretion

     670       590       1,961       1,729  

Addition and changes in estimates

     —         —         —         18  

Settlements

     (15 )      (13 )      (51 )      (27 ) 
   

 

 

    

 

 

    

 

 

    

 

 

  

Asset retirement obligation - September 30

   $ 29,212     $ 26,832     $ 29,212     $ 26,832