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Segmented Information (Tables) | 12 Months Ended
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Dec. 31, 2024
Disclosure of operating segments [abstract] |
Reportable segment results | For the year ended December 31, 2024, reportable segment results were as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ |  | ​ |  | ​ |  | Total
​ | ​ | ​ | ​ | ​ | Corporate | ​ | Continuing
(in thousands) |  | Mining |  | and Other |  | Operations
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Statement of Operations: | ​ |  |  |  |  |  |
Revenues | ​ | $ | 4,023 |  | — |  | 4,023
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Expenses: | ​ |  |  |  |  |  |
Operating expenses | ​ | $ | (4,815) |  | — |  | (4,815)
Exploration | ​ |  | (11,973) |  | — |  | (11,973)
Evaluation | ​ |  | (33,991) |  | — |  | (33,991)
General and administrative | ​ |  | (19) |  | (16,476) |  | (16,495)
​ | ​ |  | (50,798) |  | (16,476) |  | (67,274)
Segment loss | ​ | $ | (46,775) |  | (16,476) |  | (63,251)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Revenues-supplemental: | ​ |  |  |  |  |  |
Toll milling services-deferred revenue (note 10) | ​ | ​ | 4,023 |  | — |  | 4,023
​ | ​ | $ | 4,023 |  | — |  | 4,023
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Capital additions: | ​ |  |  |  |  |  |
Property, plant and equipment (note 8) | ​ | $ | 9,063 |  | 982 |  | 10,045
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Long-lived assets: | ​ |  |  |  |  |  |
Plant and equipment | ​ |  |  |  |  |  |
Cost | ​ | $ | 111,460 |  | 7,107 |  | 118,567
Accumulated depreciation | ​ |  | (42,591) |  | (473) |  | (43,064)
Mineral properties | ​ |  | 184,158 |  | — |  | 184,158
​ | ​ | $ | 253,027 |  | 6,634 |  | 259,661
​ ​ For the year ended December 31, 2023, reportable segment results were as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | Total
​ | ​ | ​ | ​ | ​ | Corporate | ​ | Continuing
(in thousands) |  | Mining |  | and Other |  | Operations
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Statement of Operations: | ​ |  |  |  |  |  |
Revenues | ​ | $ | 1,855 |  | — |  | 1,855
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Expenses: | ​ |  |  |  |  |  | ​
Operating expenses | ​ | $ | (3,898) |  | — |  | (3,898)
Exploration | ​ |  | (9,564) |  | — |  | (9,564)
Evaluation | ​ |  | (18,622) |  | — |  | (18,622)
General and administrative | ​ |  | (19) |  | (13,741) |  | (13,760)
​ | ​ |  | (32,103) |  | (13,741) |  | (45,844)
Segment loss | ​ | $ | (30,248) |  | (13,741) |  | (43,989)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Revenues-supplemental: | ​ |  |  |  |  |  |
Toll milling services-deferred revenue (note 10) | ​ |  | 1,855 |  | — |  | 1,855
​ | ​ | $ | 1,855 |  | — |  | 1,855
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Capital additions: | ​ |  |  |  |  |  |
Property, plant and equipment (note 8) | ​ | $ | 2,165 |  | 1,103 |  | 3,268
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Long-lived assets: | ​ |  |  |  |  |  |
Plant and equipment | ​ |  |  |  |  |  |
Cost | ​ | $ | 106,914 |  | 6,559 |  | 113,473
Accumulated depreciation | ​ |  | (38,178) |  | (1,162) |  | (39,340)
Mineral properties | ​ |  | 180,813 |  | — |  | 180,813
​ | ​ | $ | 249,549 |  | 5,397 |  | 254,946
Schedule of consolidated income (loss) and cash flows for the closed mines discontinued operation | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended
​ | ​ | December 31 | ​ | December 31
(in thousands) |  | 2024 |  | 2023
​ | ​ | ​ | ​ | ​ | ​ | ​
Revenue | ​ | $ | — | ​ | $ | 6,582
​ | ​ | ​ | ​ | ​ | ​ | ​
Expenses | ​ | ​ | ​ | ​ | ​ | ​
Operating expenses | ​ |  | — | ​ |  | (5,715)
Other income | ​ |  | 471 | ​ |  | 144
Income from discontinued operations, net of taxes | ​ | $ | 471 | ​ | $ | 1,011
​ Cash flows for the Closed Mines discontinued operation for 2024 and 2023 is as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended
​ | ​ | December 31 | ​ | December 31
(in thousands) |  | 2024 |  | 2023
​ | ​ | ​ | ​ | ​ | ​ | ​
Cash inflow: |  | ​ |  |  | ​ |
Net cash from operating activities | ​ | $ | 355 | ​ | $ | 3,274
Net cash flows for the year | ​ | $ | 355 | ​ | $ | 3,274

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