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 |