Long-term Reclamation Liability and Retirement Obligation Asset (Details) - USD ($) |
12 Months Ended | |||
---|---|---|---|---|
Apr. 30, 2019 |
Dec. 31, 2019 |
Dec. 31, 2018 |
Dec. 31, 2017 |
|
Regulatory Assets [Line Items] | ||||
Long-term liability, inclusive of held-for-sale | $ 7,100,000 | |||
Accrued long-term liability | 6,034,208 | $ 7,441,091 | $ 7,417,680 | |
Amount reclassified to liabilities held for sale | 1,019,705 | 0 | ||
Total liabilities held for sale | 1,019,705 | 0 | ||
Accretion of reclamation liability and amortization of retirement obligation | 100,000 | 100,000 | $ 400,000 | |
Reduction of obligation | $ 400,000 | $ 410,018 | $ 0 | |
Lucerne Properties (mineral claims) | Nevada Division of Environmental Protection | ||||
Regulatory Assets [Line Items] | ||||
Accrued long-term liability | $ 6,800,000 |