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Mining interests and plant and equipment - Disclosure of detailed information about mining interests and plant and equipment (Details) - CAD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance $ 189  
Adoption of IFRS 16 9,432  
Acquisition of Barkerville 272,121  
NSR royalty held on the Cariboo property prior to the acquisition of Barkerville 56,070  
Additions 7,150  
Depreciation (1,499)  
Depreciation capitalized 230  
Closing balance 343,693 $ 189
Cost [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Closing balance 345,689  
Accumulated depreciation [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Closing balance (1,996)  
Mining interests [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 0  
Adoption of IFRS 16 0  
Acquisition of Barkerville 258,153  
NSR royalty held on the Cariboo property prior to the acquisition of Barkerville 56,070  
Additions 5,555  
Depreciation 0  
Depreciation capitalized 230  
Closing balance 320,008 0
Mining interests [Member] | Cost [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Closing balance 320,008  
Mining interests [Member] | Accumulated depreciation [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Closing balance 0  
Plant and equipment [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 189 258
Adoption of IFRS 16 9,432 0
Acquisition of Barkerville 13,968 0
NSR royalty held on the Cariboo property prior to the acquisition of Barkerville 0 0
Additions 1,595 105
Depreciation (1,499) (174)
Depreciation capitalized 0 0
Closing balance 23,685 189
Plant and equipment [Member] | Cost [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 684  
Closing balance 25,681 684
Plant and equipment [Member] | Accumulated depreciation [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance (495)  
Closing balance $ (1,996) $ (495)