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Related party transactions (Narrative) (Details) - CAD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Disclosure of transactions between related parties [line items]    
Interest income receivable $ 2,133 $ 1,991
Associates [Member]    
Disclosure of transactions between related parties [line items]    
Amounts receivable from associates 500 3,200
Interest income 900 500
Interest income receivable 900 $ 1,700
Associates [Member] | Bridge Loan Financing [Member]    
Disclosure of transactions between related parties [line items]    
Amounts receivable from associates $ 8,800  
Interest rate 8.25%  
Associates [Member] | Working Capital Facility [Member]    
Disclosure of transactions between related parties [line items]    
Interest rate 12.50%  
Falco [Member]    
Disclosure of transactions between related parties [line items]    
Interest income receivable converted into common shares $ 1,800  
Notes receivable applied against first installment of a secured silver stream credit facility $ 20,000