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Plant and Equipment (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Property, Plant and Equipment [Line Items]
Cost	$ 11,244	$ 11,139
Accumulated depreciation	5,532	5,496
Net	5,712	5,643
Mt Todd, Australia
Property, Plant and Equipment [Line Items]
Cost	5,411	5,306
Accumulated depreciation	5,199	5,163
Net	212	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	5,500	5,500
Accumulated depreciation	0	0
Net	$ 5,500	$ 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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