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Mineral Properties - Additional Information (Details)
12 Months Ended
Jun. 30, 2017
USD ($)
a
MiningClaim
Jun. 30, 2016
USD ($)
Mineral Properties [Line Items]    
Write down of mineral properties   $ 2,482,045
Gain on sale of non-core mining claims $ 100,000  
Sleeper Gold Project | Nevada    
Mineral Properties [Line Items]    
Unpatented mining claims | MiningClaim 2,322  
Area covered by lode mining claims | a 38,300  
Grassy Mountain Project | Oregon    
Mineral Properties [Line Items]    
Unpatented lode mining claims | MiningClaim 418  
Patented lode mining claims | MiningClaim 3  
Mill site mining claims | MiningClaim 9  
Association placer claims | MiningClaim 6  
Area covered by mining claims | a 9,300  
Spring Valley property | Nevada    
Mineral Properties [Line Items]    
Write down of mineral properties   2,096,616
Estimated fair value of non-core mineral properties   0
Mill Creek property | Nevada    
Mineral Properties [Line Items]    
Write down of mineral properties   385,429
Estimated fair value of non-core mineral properties   $ 0