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RESTRICTED CASH AND INVESTMENTS (Tables) | 12 Months Ended
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Dec. 31, 2023
Restricted Cash And Investments [Abstract] |
Summary of restricted cash and investments | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ | ​ |  | ​ | ​
​ | ​ | At December 31 | ​ | At December 31
(in thousands) | ​ | 2023 | ​ | 2022
​ | ​ | ​ | ​ | ​ | ​ | ​
Cash and cash equivalents | ​ | $ | 3,259 | ​ | $ | 3,133
Investments | ​ |  | 7,972 | ​ |  | 7,972
​ | ​ | $ | 11,231 | ​ | $ | 11,105
​ | ​ | ​ | ​ | ​ | ​ | ​
Restricted cash and investments-by item: | ​ |  |  | ​ |  |
Elliot Lake reclamation trust fund | ​ | $ | 3,259 | ​ | $ | 3,133
Letters of credit facility pledged assets | ​ |  | 7,972 | ​ |  | 7,972
​ | ​ | $ | 11,231 | ​ | $ | 11,105

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