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Investments in associates (Tables)
12 Months Ended
Dec. 31, 2023
Disclosure Of Investments In Associates [Abstract]  
Disclosure of company's investments in associates [Table Text Block]
    Dolly Varden     UMS     Total  
Carrying amount at December 31, 2021 $ -   $ -   $ -  
Acquisition of equity investment   60,439     151     60,590  
Disposal (note 1)   (12,280 )   -     (12,280 )
Company's share of net loss of associates   (5,856 )   (24 )   (5,880 )
Carrying amount at December 31, 2022 $ 42,303   $ 127   $ 42,430  
Company's share of net loss of associates   (6,177 )   (5 )   (6,182 )
Carrying amount at December 31, 2023 $ 36,126   $ 122   $ 36,248  
Disclosure of reconciliation of impairment expense [Table Text Block]
Carrying amount, investment in Dolly Varden $ 55,265  
Equity interest transferred to held for sale   22.2%  
Carrying amount transferred to asset held for sale   12,280  
Less: FVLCD   (6,774 )
Impairment expense recognized $ 5,506  
Disclosure of company's share of net loss of associates [Table Text Block]
Year ended December 31, 2022   Dolly Varden     UMS     Total  
Cost recoveries $ -   $ (4,412 ) $ (4,412 )
Exploration and evaluation   16,936     1,642     18,578  
Marketing   1,057     312     1,369  
Share-based compensation   1,786     2,433     4,219  
Administrative and other   (508 )   121     (387 )
Net loss of associate, 100%   19,271     96     19,367  
Average equity interest for the year   30.4%     25%        
Company's share of net loss of associates $ 5,856   $ 24   $ 5,880  
Year ended December 31, 2023   Dolly Varden     UMS     Total  
Cost recoveries $ -   $ (5,517 ) $ (5,517 )
Exploration and evaluation   24,806     1,907     26,713  
Marketing   1,409     464     1,873  
Share-based compensation   1,971     -     1,971  
Administrative and other   (1,536 )   3,166     1,630  
Net loss of associate, 100%   26,650     20     26,670  
Average equity interest for the period   23.18%     25%        
Company's share of net loss of associates $ 6,177   $ 5   $ 6,182  
Disclosure of company's equity share of net assets of associate [Table Text Block]
    Dolly Varden     UMS  
Current assets $ 28,914   $ 879  
Non-current assets   155,198     2,750  
Current liabilities   (4,100 )   (1,654 )
Non-current liabilities   -     (1,467 )
Net assets, 100%   180,012     508  
Company's equity share of net assets of associate $ 42,303   $ 127  
Disclosure of total transactions for the period [Table Text Block]
    Years ended December 31  
    2023     2022     2021  
Exploration and evaluation costs $ 872   $ 590   $ 215  
General and administration   714     841     384  
Total transactions for the year $ 1,586   $ 1,431   $ 599