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Plant and Equipment (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Property, Plant and Equipment [Line Items]
Cost	$ 5,697	$ 5,692
Accumulated depreciation	5,473	5,459
Net	224	233
Mt Todd, Australia
Property, Plant and Equipment [Line Items]
Cost	5,364	5,359
Accumulated depreciation	5,140	5,126
Net	224	233
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	0
Accumulated depreciation	0	0
Net	$ 0	$ 0

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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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