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Related Party Transactions (Details) - USD ($)
12 Months Ended
Sep. 28, 2015
Sep. 27, 2015
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Related Party Leases          
Related Party Transaction [Line Items]          
Cash payments under joint venture agreement     $ 482,500 $ 482,500  
Payment for mineral lease (in shares)     502,604 243,025  
Amortization of non-employee stock-based compensation     $ 800,000 $ 800,000 $ 800,000
Related Party Leases          
Related Party Transaction [Line Items]          
Amount of required capital expenditures $ 9,750,000 $ 31,050,000      
Monthly cash capital contributions 30,000        
Annual capital contributions for related party leases 482,500        
Cash and cash equivalents, threshold for cash payments $ 10,500,000        
Consecutive trading days 20 days        
Accelerated capital contribution payable $ 812,500        
Non-operations cash proceeds, net, threshold for accelerated payment $ 6,250,000        
Capital contribution obligations, as a percent of smelter production 3.00%        
Stated interest rate percentage upon conversion to promissory note 6.00%