Long-Term Reclamation Liability - Reconciliation of Aggregate Retirement Liability (Details) - USD ($)	9 Months Ended	12 Months Ended
	Sep. 30, 2020	Dec. 31, 2019
Mine Reclamation and Closing Liability [Roll Forward]
Long-term reclamation liability — beginning of period	$ 6,034,208	$ 7,441,091
Reduction of obligation	0	(410,018)
Amount reclassified to liabilities held for sale	0	(1,019,705)
Accretion of reclamation liability	15,533	22,840
Long-term reclamation liability — end of period	$ 6,049,741	$ 6,034,208