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7. Asset Retirement Obligation and Accrued Reclamation Costs
12 Months Ended
Dec. 31, 2017
Asset Retirement Obligation Disclosure [Abstract]  
Asset Retirement Obligation and Accrued Reclamation Costs

Changes to the asset retirement obligation balance during 2017 and 2016 are as follows:

 

Asset Retirement Obligation      
   Balance December 31, 2015   $ 152,827  
   Accretion during 2016     5,455  
   Balance December 31, 2016     158,282  
   Accretion during 2017     5,790  
   Balance December 31, 2017   $ 164,072  

 

The Company’s total asset retirement obligation and accrued reclamation costs of $271,572 and $265,782, at December 31, 2017 and 2016, respectively, include reclamation obligations for the Idaho and Montana operations of $107,500.