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Mineral property, plant and equipment (Details) - USD ($)
$ in Thousands
 3 Months Ended
Nov. 30, 2023
Aug. 31, 2023
IfrsStatementLineItems [Line Items]    
Net book value $ 66,648 $ 64,059
Exploration and evaluation expenditures [member]    
IfrsStatementLineItems [Line Items]    
Net book value [1] 1,955 1,864
Mining property [member]    
IfrsStatementLineItems [Line Items]    
Net book value 40,640 40,303
Processing plant and related infrastructure [member]    
IfrsStatementLineItems [Line Items]    
Net book value 23,155 20,925
Machinery [member]    
IfrsStatementLineItems [Line Items]    
Net book value [2] 741 796
Other [member]    
IfrsStatementLineItems [Line Items]    
Net book value [3] 157 171
Total [member]    
IfrsStatementLineItems [Line Items]    
Net book value 66,648 $ 64,059
Gross carrying amount [member]    
IfrsStatementLineItems [Line Items]    
Cost beginning balance 68,104  
Additions 3,188  
Cost ending balance 71,292  
Gross carrying amount [member] | Exploration and evaluation expenditures [member]    
IfrsStatementLineItems [Line Items]    
Cost beginning balance [1] 1,864  
Additions [1] 91  
Cost ending balance [1] 1,955  
Gross carrying amount [member] | Mining property [member]    
IfrsStatementLineItems [Line Items]    
Cost beginning balance 41,202  
Additions 813  
Cost ending balance 42,015  
Gross carrying amount [member] | Processing plant and related infrastructure [member]    
IfrsStatementLineItems [Line Items]    
Cost beginning balance 23,063  
Additions 2,282  
Cost ending balance 25,345  
Gross carrying amount [member] | Machinery [member]    
IfrsStatementLineItems [Line Items]    
Cost beginning balance [2] 1,624  
Additions [2] 2  
Cost ending balance [2] 1,626  
Gross carrying amount [member] | Other [member]    
IfrsStatementLineItems [Line Items]    
Cost beginning balance [3] 351  
Additions [3]  
Cost ending balance [3] 351  
Accumulated depreciation and amortisation [member]    
IfrsStatementLineItems [Line Items]    
Cost beginning balance 4,045  
Additions 599  
Cost ending balance 4,644  
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 476  
Cost ending balance 1,375  
Accumulated depreciation and amortisation [member] | Processing plant and related infrastructure [member]    
IfrsStatementLineItems [Line Items]    
Cost beginning balance 2,138  
Additions 52  
Cost ending balance 2,190  
Accumulated depreciation and amortisation [member] | Machinery [member]    
IfrsStatementLineItems [Line Items]    
Cost beginning balance [2] 828  
Additions [2] 57  
Cost ending balance [2] 885  
Accumulated depreciation and amortisation [member] | Other [member]    
IfrsStatementLineItems [Line Items]    
Cost beginning balance [3] 180  
Additions [3] 14  
Cost ending balance [3] $ 194  
[1] Represents exploration and evaluation expenditures related to the Eastern Porphyry and Anfield deposits on the Buckreef property.
[2] Includes automotive and computer equipment and software.
[3] Includes leasehold improvements and right-of-use assets.