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Exploration and Evaluation Assets - Schedule of Exploration and Evaluation Assets (Details) - CAD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Disclosure of Exploration and Evaluation Assets [Line Items]    
Balance at the beginning of the period
Administration
Balance at the end of the period 39,168 38,974
Canada [Member] | Post Creek Property [Member]    
Disclosure of Exploration and Evaluation Assets [Line Items]    
Balance at the end of the period 1,845 1,811
Canada [Member] | Halcyon Property [Member]    
Disclosure of Exploration and Evaluation Assets [Line Items]    
Balance at the end of the period 497 475
Canada [Member] | Quetico Claims [Member]    
Disclosure of Exploration and Evaluation Assets [Line Items]    
Balance at the end of the period 195 87
Canada [Member] | Loveland (Enid Creek) Property [Member]    
Disclosure of Exploration and Evaluation Assets [Line Items]    
Balance at the end of the period   397
Greenland [Member] | Lingman Lake [Member]    
Disclosure of Exploration and Evaluation Assets [Line Items]    
Balance at the end of the period 27 27
Greenland [Member] | Maniitsoq Property [Member]    
Disclosure of Exploration and Evaluation Assets [Line Items]    
Balance at the end of the period 36,604 36,177
Exploration and Evaluation Assets Arising From Acquisition [Member]    
Disclosure of Exploration and Evaluation Assets [Line Items]    
Balance at the beginning of the period 648 709
Acquisition costs - cash 9 13
Balance at the end of the period 657 722
Exploration and Evaluation Assets Arising From Acquisition [Member] | Canada [Member] | Post Creek Property [Member]    
Disclosure of Exploration and Evaluation Assets [Line Items]    
Balance at the beginning of the period 308 298
Acquisition costs - cash 5 5
Balance at the end of the period 313 303
Exploration and Evaluation Assets Arising From Acquisition [Member] | Canada [Member] | Halcyon Property [Member]    
Disclosure of Exploration and Evaluation Assets [Line Items]    
Balance at the beginning of the period 238 230
Acquisition costs - cash 4 4
Balance at the end of the period 242 234
Exploration and Evaluation Assets Arising From Acquisition [Member] | Canada [Member] | Quetico Claims [Member]    
Disclosure of Exploration and Evaluation Assets [Line Items]    
Balance at the beginning of the period 42 42
Acquisition costs - cash
Balance at the end of the period 42 42
Exploration and Evaluation Assets Arising From Acquisition [Member] | Canada [Member] | Loveland (Enid Creek) Property [Member]    
Disclosure of Exploration and Evaluation Assets [Line Items]    
Balance at the beginning of the period   83
Acquisition costs - cash  
Balance at the end of the period   83
Exploration and Evaluation Assets Arising From Acquisition [Member] | Greenland [Member] | Lingman Lake [Member]    
Disclosure of Exploration and Evaluation Assets [Line Items]    
Balance at the beginning of the period 14 14
Acquisition costs - cash
Balance at the end of the period 14 14
Exploration and Evaluation Assets Arising From Acquisition [Member] | Greenland [Member] | Maniitsoq Property [Member]    
Disclosure of Exploration and Evaluation Assets [Line Items]    
Balance at the beginning of the period 46 42
Acquisition costs - cash 4
Balance at the end of the period 46 46
Exploration and Evaluation Assets Arising From Exploration [Member]    
Disclosure of Exploration and Evaluation Assets [Line Items]    
Balance at the beginning of the period 38,445 37,924
Administration  
Corporate social responsibility   1
Property maintenance 17 12
Drilling 11 173
Environment, health & safety  
Geology 27 75
Geophysics 1 67
Helicopter charter aircraft (recovery)  
Infrastructure  
Write-off  
Increase in exploration and evaluation assets 56 328
Balance at the end of the period 38,511 38,252
Exploration and Evaluation Assets Arising From Exploration [Member] | Canada [Member] | Post Creek Property [Member]    
Disclosure of Exploration and Evaluation Assets [Line Items]    
Balance at the beginning of the period 1,529 1,498
Administration  
Corporate social responsibility  
Property maintenance 6
Drilling
Environment, health & safety  
Geology 3 4
Geophysics
Helicopter charter aircraft (recovery)  
Infrastructure  
Write-off  
Increase in exploration and evaluation assets 3 10
Balance at the end of the period 1,532 1,508
Exploration and Evaluation Assets Arising From Exploration [Member] | Canada [Member] | Halcyon Property [Member]    
Disclosure of Exploration and Evaluation Assets [Line Items]    
Balance at the beginning of the period 252 233
Administration  
Corporate social responsibility  
Property maintenance 5
Drilling
Environment, health & safety  
Geology 3 3
Geophysics
Helicopter charter aircraft (recovery)  
Infrastructure  
Write-off  
Increase in exploration and evaluation assets 3 8
Balance at the end of the period 255 241
Exploration and Evaluation Assets Arising From Exploration [Member] | Canada [Member] | Quetico Claims [Member]    
Disclosure of Exploration and Evaluation Assets [Line Items]    
Balance at the beginning of the period 142 39
Administration  
Corporate social responsibility  
Property maintenance 1
Drilling 2
Environment, health & safety  
Geology 10 1
Geophysics 1 2
Helicopter charter aircraft (recovery)  
Infrastructure  
Write-off  
Increase in exploration and evaluation assets 11 6
Balance at the end of the period 153 45
Exploration and Evaluation Assets Arising From Exploration [Member] | Canada [Member] | Loveland (Enid Creek) Property [Member]    
Disclosure of Exploration and Evaluation Assets [Line Items]    
Balance at the beginning of the period   33
Administration  
Corporate social responsibility  
Property maintenance  
Drilling   161
Environment, health & safety  
Geology   55
Geophysics   65
Helicopter charter aircraft (recovery)  
Infrastructure  
Write-off  
Increase in exploration and evaluation assets   281
Balance at the end of the period   314
Exploration and Evaluation Assets Arising From Exploration [Member] | Greenland [Member] | Lingman Lake [Member]    
Disclosure of Exploration and Evaluation Assets [Line Items]    
Balance at the beginning of the period 13 13
Administration  
Corporate social responsibility  
Property maintenance
Drilling
Environment, health & safety  
Geology
Geophysics
Helicopter charter aircraft (recovery)  
Infrastructure  
Write-off  
Increase in exploration and evaluation assets 13
Balance at the end of the period 13 27
Exploration and Evaluation Assets Arising From Exploration [Member] | Greenland [Member] | Maniitsoq Property [Member]    
Disclosure of Exploration and Evaluation Assets [Line Items]    
Balance at the beginning of the period 36,519 36,108
Administration  
Corporate social responsibility   1
Property maintenance 17
Drilling 11 10
Environment, health & safety  
Geology 11 12
Geophysics
Helicopter charter aircraft (recovery)  
Infrastructure  
Write-off  
Increase in exploration and evaluation assets 39 23
Balance at the end of the period $ 36,558 $ 36,131