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Interim Financial Statements - Additional Information (Details)
oz in Thousands
 3 Months Ended
Nov. 09, 2017
Mar. 31, 2018
USD ($)
oz
Mar. 31, 2017
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Line of Credit Facility [Line Items]          
Annual gold-equivalent production (in ounces) | oz   20      
Accumulated deficit   $ 225,089,320   $ 222,604,417  
Net loss   2,484,903 $ 2,774,180    
Net cash used in operating activities   1,098,927 1,959,814    
Cash and cash equivalents   2,027,789 $ 388,571 2,066,718 $ 184,359
Current assets   7,667,578   7,731,508  
Current liabilities   1,579,239   $ 1,109,485  
Current assets in excess of current liabilities   6,100,000      
Unused borrowing capacity   7,000,000      
Reverse stock split conversion ratio 0.2        
Purchase Agreement | Leviston Resources LLC          
Line of Credit Facility [Line Items]          
Remaining amount available for issuance under agreement   $ 3,200,000