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Mining interests and plant and equipment (Tables)
 12 Months Ended
Dec. 31, 2019
Disclosure of detailed information about property, plant and equipment [abstract]  
Disclosure of detailed information about mining interests and plant and equipment [Table Text Block]
        2019      
2018		  
        Mining
interests		     Plant and equipment     Total     Plant and equipment  
        $     $     $     $  
                         
Net book value - January 1   -     189     189     258  
    Adoption of IFRS 16 (Note 4)   -     9,432     9,432     -  
    Acquisition of Barkerville (Note 7)   258,153     13,968     272,121     -  
    NSR royalty held on the Cariboo property prior
    to the acquisition of Barkerville (Note 7)		   56,070     -     56,070     -  
    Additions   5,555     1,595     7,150     105  
    Depreciation   -     (1,499 )   (1,499 )   (174 )
    Depreciation capitalized   230     -     230     -  
Net book value - December 31   320,008     23,685     343,693     189  
                         
Closing balance                        
    Cost   320,008     25,681     345,689     684  
    Accumulated depreciation   -     (1,996 )   (1,996 )   (495 )
Net book value   320,008     23,685     343,693     189