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Investment in Ambler Metals LLC - Financial information (Details) - USD ($) $ in Thousands | 10 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Nov. 30, 2020 | Nov. 30, 2021 | Nov. 30, 2020 | Nov. 30, 2019 | Feb. 11, 2020
The carrying value of investment in Ambler Metals LLC |  |  |  |  |
Share of loss on equity investment |  | $ (13,082) | $ (2,855) |  |
Investment in Ambler Metals LLC. | $ 173,145 | 160,063 | 173,145 |  |
Assets [Abstract] |  |  |  |  |
Total assets | 185,265 | 167,305 | 185,265 |  |
Mineral properties |  | 119 |  |  |
Liabilities [Abstract] |  |  |  |  |
Total liabilities | (1,454) | (1,266) | (1,454) |  |
Ambler Metals' net loss |  |  |  |  |
Depreciation |  | 21 | 91 |  |
General and administrative |  | 1,517 | 1,650 | $ 1,838 |
Professional Fees |  | 818 | 1,347 | 1,382 |
Foreign exchange loss (gain) |  | 36 | 56 | $ (19) |
Ambler Metals LLC |  |  |  |  |
Assets [Abstract] |  |  |  |  |
Total assets | 171,991 | 149,374 | 171,991 |  |
Cash | 81,673 | 61,205 | 81,673 |  |
Loan receivable from South32 (current and long-term) | 58,478 | 55,355 | 58,478 |  |
Mineral properties | 30,705 | 30,757 | 30,705 |  |
Liabilities [Abstract] |  |  |  |  |
Total liabilities | (1,496) | (5,043) | (1,496) |  |
Accounts payable and accrued liabilities | (1,445) | (4,148) | (1,445) |  |
Members' equity (Total assets less Total liabilities) | 170,495 | 144,331 | 170,495 |  |
Ambler Metals' net loss |  |  |  |  |
Depreciation | 95 | 77 |  |  |
Corporate salaries and wages | 614 | 2,421 |  |  |
General and administrative | 653 | 756 |  |  |
Lease expense | 48 | 276 |  |  |
Mineral properties expense | 3,488 | 22,639 |  |  |
Professional Fees | 1,990 | 1,047 |  |  |
Foreign exchange loss (gain) | 3 | 6 |  |  |
Interest income | (1,180) | (1,058) |  |  |
Comprehensive loss | 5,711 | 26,164 |  |  |
Revision of Prior Period, Adjustment [Member] |  |  |  |  |
Ambler Metals' net loss |  |  |  |  |
Mineral properties expense | 300 |  |  |  |
Ambler Metals |  |  |  |  |
The carrying value of investment in Ambler Metals LLC |  |  |  |  |
Investment in Ambler Metals LLC. |  |  |  |  | $ 176,000
Share of loss on equity investment | (2,855) | (13,082) |  |  |
Investment in Ambler Metals LLC. | $ 173,145 | $ 160,063 | $ 173,145 |  |

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