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Plant And Equipment | 12 Months Ended
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Dec. 31, 2020
Plant and Equipment |
Plant And Equipment | 5. Plant and Equipment ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2020 | ​ | December 31, 2019 | ​
​ | ​ | ​ | ​ | ​ | Accumulated | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Accumulated | ​ | ​ | ​ | ​
​ |  | Cost |  | Depreciation |  | Net |  | Cost |  | Depreciation |  | Net |
Mt Todd, Australia | ​ | $ | 5,306 | ​ | $ | 5,163 | ​ | $ | 143 | ​ | $ | 5,237 | ​ | $ | 5,114 | ​ | $ | 123 | ​
Corporate, United States | ​ | ​ | 333 | ​ | ​ | 333 | ​ | ​ | — | ​ | ​ | 333 | ​ | ​ | 333 | ​ | ​ | — | ​
Used mill equipment, Canada | ​ | ​ | 5,500 | ​ | ​ | — | ​ | ​ | 5,500 | ​ | ​ | 5,500 | ​ | ​ | — | ​ | ​ | 5,500 | ​
​ | ​ | $ | 11,139 | ​ | $ | 5,496 | ​ | $ | 5,643 | ​ | $ | 11,070 | ​ | $ | 5,447 | ​ | $ | 5,623 | ​
​ We continue to actively market the used mill equipment; however, the COVID-19 pandemic has created uncertainty around our ability to effectively market the equipment while travel restrictions and other related conditions exist. We do not classify the mill equipment as ‘held for sale’ as of December 31, 2020 or 2019 because we do not have reasonable assurance that the mill equipment will be sold within 12 months. We are not currently depreciating the used mill equipment as we continue to market it and it is not in use. During the years ended December 31, 2020 and 2019, the Company evaluated the value of the used mill equipment for recoverability. Based on an independent valuation by a qualified third party, no impairment charge was required.

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- Definition The entire disclosure for long-lived, physical asset used in normal conduct of business and not intended for resale. Includes, but is not limited to, work of art, historical treasure, and similar asset classified as collections. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=120429125&loc=d3e99893-112916 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -URI http://asc.fasb.org/topic&trid=2155823 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=120429125&loc=SL120174063-112916 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=120429125&loc=d3e99779-112916 + Details
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