Revenue, Deferred Revenue and Related Costs (Details) $ / shares in Units, shares in Millions				1 Months Ended	12 Months Ended
	Dec. 03, 2019 $ / item	Dec. 02, 2019 USD ($) $ / oz $ / item	Aug. 02, 2017 USD ($) $ / shares shares	Nov. 30, 2020 USD ($)	Dec. 31, 2020 USD ($) $ / item	Dec. 31, 2019 USD ($)
Oxide plant lease (Note 17)					$ 5,637,000	$ 7,730,000
Lease related costs					1,988,000	2,377,000
Operating Lease Monthly Fee					$ 125,000
Variable fee (per tonne) | $ / item	11.00	22.00			22.00
Increase (Decrease) in Deferred Revenue					$ 63,000	(128,000)
Average price | $ / oz		20.00
Average head grade | $ / item		1,000
Lease payment		$ 125,000
Oxide Plant
Renewal term			2 years
Expected lease proceeds			$ 1,000,000		300,000	300,000
Gross proceeds from common stock sale			$ 1,000,000	$ 1,000,000
Common stock issued (in shares) | shares			1.8
Sale price (in dollars per shares) | $ / shares			$ 0.55
Volume weighted average stock price period			30 days
Deferred revenue					300,000
Increase (Decrease) in Deferred Revenue					$ 74,000	74,000
Termination notice period	150 days	120 days
Velardena Properties
Lease related costs						2,400,000
Increase (Decrease) in Deferred Revenue						$ 7,700,000