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7. Asset Retirement Obligation and Accrued Reclamation Costs (Tables)
12 Months Ended
Dec. 31, 2017
Asset Retirement Obligation Disclosure [Abstract]  
Schedule of Asset Retirement Obligations
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