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Reclamation and Environmental - Changes to Asset Retirement Obligation (Details) - USD ($)
12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Asset Retirement Obligation Disclosure [Abstract]    
Balance at beginning of year $ 1,261,034 $ 1,402,039
Accretion expense 150,736 137,288
Payments (339,219) (278,293)
Balance at end of year $ 1,072,551 $ 1,261,034