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Plant and Equipment (Details) - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Property, Plant and Equipment [Line Items] |  |
Cost | $ 11,197 | $ 11,139
Accumulated depreciation | 5,519 | 5,496
Net | 5,678 | 5,643
Mt Todd, Australia |  |
Property, Plant and Equipment [Line Items] |  |
Cost | 5,364 | 5,306
Accumulated depreciation | 5,186 | 5,163
Net | 178 | 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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- Definition Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.13) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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