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ASSET RETIREMENT OBLIGATION (Tables) | 12 Months Ended
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Dec. 31, 2021
ASSET RETIREMENT OBLIGATION |
Summary of Asset Retirement Obligation | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | December 31, |  | December 31,
(thousands of dollars) | ​ | 2021 | ​ | 2020
Balance, beginning of period | ​ | $ | — | ​ | $ | 6,300
Liabilities settled | ​ |  | — | ​ |  | (1,262)
Accretion expense | ​ |  | — | ​ |  | 201
Balance, end of period | ​ |  | — | ​ |  | 5,239
Less: Obligation transferred to enCore | ​ | ​ | — | ​ | ​ | (5,239)
Non-current portion | ​ | $ | — | ​ | $ | —

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- Definition Tabular disclosure of the changes in carrying amount of a liability for asset retirement obligations, for changes such as new obligations, changes in estimates of existing obligations, spending on existing obligations, property dispositions, and foreign currency translation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13201-110859 + Details
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