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Intangible Assets
 3 Months Ended
Mar. 31, 2012
Intangible Assets [Abstract]  
Intangible Assets

6. Intangible Assets

Amounts recorded as intangible assets along with the balances and accumulated amortization are reflected in the table below:

 

 

                 
    March 31,
2012		     December 31,
2011		  
    (In thousands)  
    (Unaudited)        

Contract intangibles

   $ 89,420     $ 89,420  

Less accumulated amortization

     (15,211 )      (14,256 ) 
   

 

 

    

 

 

  

Net book value

   $ 74,209     $ 75,164  
   

 

 

    

 

 

  

 

                 
    Three months ended
March  31,		  
    2012     2011  
   

(In thousands)

(Unaudited)

  

Total amortization expense on intangible assets

   $ 955     $ 2,650  
   

 

 

    

 

 

  

 

The estimates of future expense for the periods indicated below are based on current mining plans, which are subject to revision in future periods.

 

 

         
    Estimated
Amortization
Expense 		 
    (In thousands)  
    (Unaudited)  

Remainder of 2012

   $ 2,645  

For year ended December 31, 2013

     4,664  

For year ended December 31, 2014

     4,500  

For year ended December 31, 2015

     4,500  

For year ended December 31, 2016

     4,500