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Mineral Properties - Additional Information (Details)
 9 Months Ended 12 Months Ended
Mar. 31, 2018
Jun. 30, 2018
USD ($)
a
MiningClaim
Jun. 30, 2017
USD ($)
Mineral Properties [Line Items]      
Total payment to acquire all rights to the private land | $   $ 2,400,000  
Gain on sale of non-core mining claims | $     $ 100,000
Sleeper Gold Project | Nevada      
Mineral Properties [Line Items]      
Unpatented mining claims   2,322  
Area covered by lode mining claims | a   38,300  
Grassy Mountain Project | Oregon      
Mineral Properties [Line Items]      
Unpatented lode mining claims   418  
Patented lode mining claims   3  
Mill site mining claims   9  
Association placer claims   6  
Area covered by mining claims | a   9,300  
Percentage of Net Smelter Royalty 6.00% 1.50%  
Total payment to acquire all rights to the private land | $   $ 2,400,000