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Long-Term Reclamation Liability - Reconciliation of Aggregate Retirement Liability (Details) - USD ($)
6 Months Ended 12 Months Ended
Jun. 30, 2018
Dec. 31, 2017
Mine Reclamation and Closing Liability [Roll Forward]    
Long-term reclamation liability — beginning of period $ 7,417,680 $ 7,353,346
Additional obligations incurred 0 0
Accretion of reclamation liability 11,054 64,334
Long-term reclamation liability — end of period $ 7,428,734 $ 7,417,680