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Investment in Ambler Metals LLC - Narrative (Details) | 12 Months Ended |
--- | --- | ---
Nov. 30, 2023 USD ($) Owner | Nov. 30, 2022 USD ($) | Nov. 30, 2021 USD ($) | Feb. 11, 2020 USD ($)
Schedule of Equity Method Investments [Line Items] |  |  |  |
Loss for the year | $ (14,951,000) | $ (24,257,000) | $ (21,660,000) |
Number of board members | Owner | 2 |  |  |
Investment in Ambler Metals | $ 135,021,000 | 142,754,000 |  |
Ambler Metals LLC |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Joint venture, contributed amount | $ 111,000 | 51,000 |  |
Percentage of ownership | 50.00% |  |  | 50.00%
Loss for the year | $ (15,700,000) | (34,700,000) |  |
Number of board members | Owner | 4 |  |  |
Investment in Ambler Metals | $ 135,021,000 |  |  |
Fair value ascribed to Ambler Metals LLC interest |  | 142,754,000 | $ 160,063,000 |
South32 | Ambler Metals LLC |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Percentage of ownership |  |  |  | 50.00%
Upper Kobuk Mineral Projects | South32 | Ambler Metals LLC |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Joint venture, contributed amount |  |  |  | $ 145,000,000
Ambler Metals |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Operating expenses | $ 27,000 | 0 |  |
Net proceeds from mineral transfer |  | $ 140,000 |  |

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