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Mineral properties and development costs - Narrative (Details) - USD ($) |  |  | 10 Months Ended | 12 Months Ended | 131 Months Ended | 216 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Apr. 10, 2017 | Oct. 19, 2011 | Nov. 30, 2020 | Nov. 30, 2021 | Nov. 30, 2020 | Nov. 30, 2019 | Nov. 30, 2020 | Nov. 30, 2021 | Feb. 11, 2020 | Jan. 11, 2010
Mineral claims |  |  |  | $ 119,000 |  |  |  |  |  |
Feasibility study (note 6(a)) |  |  |  |  | $ 1,065,000 |  |  |  |  |
Mineral properties expense |  |  |  |  | 1,545,000 | $ 19,211,000 |  |  |  |
Payments received recognized as consideration |  |  |  |  | 31,000,000.0 |  |  |  |  |
Feasibility costs |  |  |  |  | 1,065,000 |  |  |  |  |
Cumulative spend |  |  |  |  |  |  |  | $ 147,000,000 |  |
Mineral properties and development costs |  |  |  | 119,000 |  |  |  | 119,000 |  |
Option Agreement to Form a Joint Venture with South32 | South32 |  |  |  |  |  |  |  |  |  |
Mineral property, fair value of consideration |  |  |  |  |  |  |  |  |  |
Mineral properties |  |  |  |  |  |  |  |  | 30,600,000 |
Maximum subscription price | $ 150,000,000 |  |  |  |  |  |  |  |  |
Required minimum amount to maintain option in good standing, period | 3 years |  |  |  |  |  |  |  |  |
Option to enter into the 50/50 joint venture, period (in years) | 3 years |  |  |  |  |  |  |  |  |
Percentage of ownership | 50.00% |  |  |  |  |  |  |  |  |
Subscription of options, description | To subscribe for 50% of the joint venture, the Option Agreement provided that South32 must contribute $150 million, plus (i) any amounts Trilogy spends on matched parallel funding to a maximum of $16 million over the three-year period and (ii) $5 million if the option had been exercised between April 1, 2018 and March 31, 2019 or $10 million if the option was exercised between April 1, 2019 and the expiration date of the option, less the amount of the initial funding contributed by South32 (the “Subscription Price”). |  |  |  |  |  |  |  |  |
Machinery and equipment derecognized |  |  |  |  |  |  |  |  | 620,000 |
Scenario, Plan | Option Agreement to Form a Joint Venture with South32 | South32 |  |  |  |  |  |  |  |  |  |
Matched parallel funding on Trilogy spending, maximum amount | $ 16,000,000 |  |  |  |  |  |  |  |  |
Required minimum amount to maintain option in good standing | 10,000,000 |  |  |  |  |  |  |  |  |
Amount due if exercised between April 1, 2018 and March 31, 2019 | 5,000,000 |  |  |  |  |  |  |  |  |
Amount due if exercised between April 1, 2019 and the expiration date | $ 10,000,000 |  |  |  |  |  |  |  |  |
Alaska, USA |  |  |  |  |  |  |  |  |  |
Mineral properties expense |  |  |  |  | 1,545,000 | 19,211,000 |  |  |  |
Mineral properties |  |  | $ (30,631,000) |  | (30,631,000) |  | $ (30,631,000) |  |  |
Cumulative spend |  |  |  |  |  |  |  | 115,300,000 |  |
Cumulative acquisition costs |  |  |  |  |  |  |  | 30,600,000 |  |
Mineral properties and development costs |  |  |  | $ 119,000 |  | 30,631,000 |  | $ 119,000 |  |
Ambler | Alaska, USA |  |  |  |  |  |  |  |  |  |
Mineral property interest percentage |  |  |  |  |  |  |  |  |  | 100.00%
Mineral property, fair value of consideration |  |  |  |  |  |  |  |  |  | $ 26,600,000
Net smelter return royalty |  |  |  |  |  |  |  |  |  | 1.00%
Purchase price for smelter return royalty (one-time payment) |  |  |  |  |  |  |  |  |  | $ 10,000,000.0
Mineral properties |  |  | (26,631,000) |  | (26,631,000) |  | (26,631,000) |  |  |
Mineral properties and development costs |  |  |  |  |  | 26,631,000 |  |  |  |
Arctic Project |  |  |  |  |  |  |  |  |  |
Feasibility study (note 6(a)) |  |  | 1,100,000 |  | 1,500,000 |  |  |  |  |
Cost of feasibility study |  |  |  |  |  |  | 700,000 |  |  |
Feasibility costs |  |  | 1,100,000 |  | 1,500,000 |  |  |  |  |
Bornite |  |  |  |  |  |  |  |  |  |
Mineral claims |  | $ 4,000,000 |  |  |  |  |  |  |  |
Net proceeds royalty |  | 15.00% |  |  |  |  |  |  |  |
Minimum purchase amount |  | $ 0 |  |  |  |  |  |  |  |
Bornite | Alaska, USA |  |  |  |  |  |  |  |  |  |
Discount on consideration |  | $ 40,000,000 |  |  |  |  |  |  |  |
Mineral properties |  |  | $ (4,000,000) |  | $ (4,000,000) |  | $ (4,000,000) |  |  |
Mineral properties and development costs |  |  |  |  |  | $ 4,000,000 |  |  |  |
Bornite | Minimum |  |  |  |  |  |  |  |  |  |
Mineral property interest percentage |  | 16.00% |  |  |  |  |  |  |  |
Net smelter return royalty |  | 1.00% |  |  |  |  |  |  |  |
Bornite | Maximum |  |  |  |  |  |  |  |  |  |
Mineral property interest percentage |  | 25.00% |  |  |  |  |  |  |  |
Net smelter return royalty |  | 2.50% |  |  |  |  |  |  |  |
Upper Kobuk Mineral Projects | Option Agreement to Form a Joint Venture with South32 |  |  |  |  |  |  |  |  |  |
Mineral properties |  |  |  |  |  |  |  |  | $ 30,600,000 |

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