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Mineral property, plant and equipment (Details) - USD ($)
$ in Thousands
 9 Months Ended
May 31, 2024
Aug. 31, 2023
IfrsStatementLineItems [Line Items]    
Net book value $ 72,504 $ 64,059
Exploration And Evaluation Expenditures [Member]    
IfrsStatementLineItems [Line Items]    
Net book value [1] 2,152 1,864
Mining property [member]    
IfrsStatementLineItems [Line Items]    
Net book value 42,727 40,303
Processing Plant And Related Infrastructure [Member]    
IfrsStatementLineItems [Line Items]    
Net book value 26,766 20,925
Machinery [member]    
IfrsStatementLineItems [Line Items]    
Net book value [2] 733 796
Other [Member]    
IfrsStatementLineItems [Line Items]    
Net book value [3] 126 171
Total [Member]    
IfrsStatementLineItems [Line Items]    
Net book value 72,504 $ 64,059
Gross carrying amount [member]    
IfrsStatementLineItems [Line Items]    
Cost beginning balance 68,104  
Additions 10,252  
Cost ending balance 78,356  
Gross carrying amount [member] | Exploration And Evaluation Expenditures [Member]    
IfrsStatementLineItems [Line Items]    
Cost beginning balance [1] 1,864  
Additions [1] 288  
Cost ending balance [1] 2,152  
Gross carrying amount [member] | Mining property [member]    
IfrsStatementLineItems [Line Items]    
Cost beginning balance 41,202  
Additions 3,792  
Cost ending balance 44,994  
Gross carrying amount [member] | Processing Plant And Related Infrastructure [Member]    
IfrsStatementLineItems [Line Items]    
Cost beginning balance 23,063  
Additions 6,051  
Cost ending balance 29,114  
Gross carrying amount [member] | Machinery [member]    
IfrsStatementLineItems [Line Items]    
Cost beginning balance [2] 1,624  
Additions [2] 108  
Cost ending balance [2] 1,732  
Gross carrying amount [member] | Other [Member]    
IfrsStatementLineItems [Line Items]    
Cost beginning balance [3] 351  
Additions [3] 13  
Cost ending balance [3] 364  
Accumulated depreciation and amortisation [member]    
IfrsStatementLineItems [Line Items]    
Cost beginning balance 4,045  
Additions 1,807  
Cost ending balance 5,852  
Accumulated depreciation and amortisation [member] | Exploration And Evaluation Expenditures [Member]    
IfrsStatementLineItems [Line Items]    
Cost beginning balance [1]  
Additions [1]  
Cost ending balance [1]  
Accumulated depreciation and amortisation [member] | Mining property [member]    
IfrsStatementLineItems [Line Items]    
Cost beginning balance 899  
Additions 1,368  
Cost ending balance 2,267  
Accumulated depreciation and amortisation [member] | Processing Plant And Related Infrastructure [Member]    
IfrsStatementLineItems [Line Items]    
Cost beginning balance 2,138  
Additions 210  
Cost ending balance 2,348  
Accumulated depreciation and amortisation [member] | Machinery [member]    
IfrsStatementLineItems [Line Items]    
Cost beginning balance [2] 828  
Additions [2] 171  
Cost ending balance [2] 999  
Accumulated depreciation and amortisation [member] | Other [Member]    
IfrsStatementLineItems [Line Items]    
Cost beginning balance [3] 180  
Additions [3] 58  
Cost ending balance [3] $ 238  
[1] Represents exploration and evaluation expenditures related to the Eastern Porphyry and Anfield deposits on the Buckreef property.
[2] Includes automotive, computer equipment and software.
[3] Includes leasehold improvements and right-of-use assets.