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Reclamation and Environmental - Additional Information (Details)
12 Months Ended
Jun. 30, 2018
USD ($)
Jun. 30, 2016
USD ($)
Jun. 30, 2017
USD ($)
Site Contingency [Line Items]      
Commutation account $ 1,769,501   $ 2,086,562
Asset retirement obligation 1,072,551 $ 1,402,039 1,261,034
Asset retirement obligation, current 101,593   216,101
Asset retirement obligation, noncurrent 970,958   1,044,933
Sleeper Gold Project      
Site Contingency [Line Items]      
Maximum reclamation costs covered by insurance policy 25,000,000    
Commutation account 1,769,501   $ 2,086,562
Undiscounted estimate of reclamation costs $ 3,835,050    
Inflation rate 2.00% 2.00%  
Sleeper Gold Project | Measurement Input Risk Free Interest Rate      
Site Contingency [Line Items]      
Credit adjusted risk free rate 9.76 9.76