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Plant and Equipment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Property, Plant and Equipment [Line Items]
Cost	$ 5,692	$ 11,139
Accumulated depreciation	5,459	5,496
Net	233	5,643
Impairment charge	5,500
Mt Todd, Australia
Property, Plant and Equipment [Line Items]
Cost	5,359	5,306
Accumulated depreciation	5,126	5,163
Net	233	143
Corporate, United States
Property, Plant and Equipment [Line Items]
Cost	333	333
Accumulated depreciation	333	333
Net	0	0
Used mill equipment, Canada
Property, Plant and Equipment [Line Items]
Cost	0	5,500
Accumulated depreciation	0	0
Net	$ 0	$ 5,500

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Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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