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Schedule of Company's Deferred Tax Asset (Liability) (Details) - United States - USD ($)
Jun. 30, 2018
Jun. 30, 2017
Operating Loss Carryforwards [Line Items]    
Mineral properties $ 166,476 $ (248,008)
Asset retirement obligation 225,236 428,572
Stock options 264,898 404,628
Net operating losses 8,042,088 9,826,149
Gross deferred tax assets 8,698,698 10,411,341
Valuation allowance $ (8,698,698) $ (10,411,341)