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Income taxes - Narrative (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Nov. 30, 2021 | Nov. 30, 2020 | Nov. 30, 2019 | Jun. 19, 2015
Loss carry-forwards | $ 194,000 |  |  |
Operating loss carry-forwards limitations | Future use of U.S. loss carry-forwards is subject to certain limitations under provisions of the Internal Revenue Code including limitations subject to Section 382, which relates to a 50% change in control over a three-year period and are further dependent upon the Company attaining profitable operations. An ownership change under Section 382 occurred on January 22, 2009 regarding losses incurred by AGC, of which the attributes of those losses were transferred to Trilogy Metals US with the purchase of the mineral property in October 2011. Therefore, approximately $39.4 million of the U.S. losses above are subject to limitation under Section 382. Accordingly, the Company’s ability to use these losses may be limited. |  |  |
Change In control percentage | 50.00% |  |  |
Operating losses that can be carried forward indefinitely | $ 21,000 |  |  |
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount | $ 4,989 | $ (38,260) | $ 3,284 |
Section 382 |  |  |  |
change in control, period | 3 years |  |  |
Losses in Canada subject lo limitations |  |  |  |
Loss carry-forwards |  |  |  | $ 15,200
US losses subject to limitations | Section 382 |  |  |  |
U.S. carryforward losses | $ 39,400 |  |  |

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