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Property, plant and equipment - Schedule of Property, plant and equipment (Details) - CAD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Property, plant and equipment    
Beginning of year $ 111,696  
Impairment of assets (138,371) $ (140,000)
End of year 97,285 111,696
Gross Carrying Amount    
Property, plant and equipment    
Beginning of year 131,909 93,241
Acquisition of Tintic   13,054
Additions 18,092 29,409
Assets classified as held for sale and other disposals (7,915) (1,351)
Impairment of assets (11,490) (5,455)
Other (1,647) (896)
Currency translation adjustments 2,625 3,907
End of year 131,574 131,909
Accumulated Depreciation, Amortisation and Impairment    
Property, plant and equipment    
Beginning of year (20,213) (9,529)
Depreciation 15,119 12,869
Assets classified as held for sale and other disposals (1,643) (192)
Impairment of assets   (2,687)
Other 91  
Currency translation adjustments 691 694
End of year (34,289) (20,213)
Land and Buildings    
Property, plant and equipment    
End of year 24,021  
Land and Buildings | Gross Carrying Amount    
Property, plant and equipment    
Beginning of year 27,980  
Additions 2,235  
Other (495)  
Transfers 1,985  
Currency translation adjustments (88)  
End of year 31,617 27,980
Land and Buildings | Accumulated Depreciation, Amortisation and Impairment    
Property, plant and equipment    
Beginning of year (4,468)  
Depreciation 3,134  
Other 13  
Currency translation adjustments 7  
End of year (7,596) (4,468)
Machinery and Equipment    
Property, plant and equipment    
End of year 61,865  
Machinery and Equipment | Gross Carrying Amount    
Property, plant and equipment    
Beginning of year 80,208  
Additions 12,358  
Assets classified as held for sale and other disposals (7,814)  
Impairment of assets (9,013)  
Other (1,607)  
Transfers 12,905  
Currency translation adjustments 1,521  
End of year 88,558 80,208
Machinery and Equipment | Accumulated Depreciation, Amortisation and Impairment    
Property, plant and equipment    
Beginning of year (15,745)  
Depreciation 11,985  
Assets classified as held for sale and other disposals (1,643)  
Other 78  
Currency translation adjustments 684  
End of year (26,693) (15,745)
Construction-in-progress    
Property, plant and equipment    
End of year 11,399  
Construction-in-progress | Gross Carrying Amount    
Property, plant and equipment    
Beginning of year 23,721  
Additions 3,499  
Assets classified as held for sale and other disposals (101)  
Impairment of assets (2,477)  
Other 455  
Transfers (14,890)  
Currency translation adjustments 1,192  
End of year 11,399 $ 23,721
Equipment    
Property, plant and equipment    
Aggregate amount of consideration receivable 6,700  
Equipment | Gross Carrying Amount    
Property, plant and equipment    
Disposals $ (1,300)