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Exploration and Evaluation Assets - Schedule of Exploration and Evaluation Assets (Details) - CAD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Disclosure of Exploration and Evaluation Assets [Line Items]    
Balance at the beginning of the year
Administration
Balance at the end of the year 28,711 64,925
Greenland [Member] | Maniitsoq Property [Member]    
Disclosure of Exploration and Evaluation Assets [Line Items]    
Balance at the end of the year 36,233 62,614
Canada [Member] | Post Creek Property [Member]    
Disclosure of Exploration and Evaluation Assets [Line Items]    
Balance at the end of the year 1,818 1,766
Canada [Member] | Halcyon Property [Member]    
Disclosure of Exploration and Evaluation Assets [Line Items]    
Balance at the end of the year 479 444
Canada [Member] | Quetico Claims [Member]    
Disclosure of Exploration and Evaluation Assets [Line Items]    
Balance at the end of the year 154 70
Canada [Member] | Enid Creek [Member]    
Disclosure of Exploration and Evaluation Assets [Line Items]    
Balance at the end of the year  
Canada [Member] | Lingman Lake [Member]    
Disclosure of Exploration and Evaluation Assets [Line Items]    
Balance at the end of the year 27 19
United States [Member] | Section 35 Property [Member]    
Disclosure of Exploration and Evaluation Assets [Line Items]    
Balance at the end of the year   12
Exploration and Evaluation Assets Arising From Acquisition [Member]    
Disclosure of Exploration and Evaluation Assets [Line Items]    
Balance at the beginning of the year 709 602
Acquisition costs - cash 13 25
Balance at the end of the year 722 627
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 year 298  
Acquisition costs - cash 5  
Balance at the end of the year 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 year 230  
Acquisition costs - cash 4  
Balance at the end of the year 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 year 42  
Acquisition costs - cash  
Balance at the end of the year 42  
Exploration and Evaluation Assets Arising From Acquisition [Member] | Canada [Member] | Enid Creek [Member]    
Disclosure of Exploration and Evaluation Assets [Line Items]    
Balance at the beginning of the year 83  
Acquisition costs - cash  
Balance at the end of the year 83  
Exploration and Evaluation Assets Arising From Acquisition [Member] | Canada [Member] | Lingman Lake [Member]    
Disclosure of Exploration and Evaluation Assets [Line Items]    
Balance at the beginning of the year 14  
Acquisition costs - cash  
Balance at the end of the year 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 year 42 42
Acquisition costs - cash 4
Balance at the end of the year 46 42
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 year   288
Acquisition costs - cash   5
Balance at the end of the year   293
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 year   222
Acquisition costs - cash   4
Balance at the end of the year   226
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 year   42
Acquisition costs - cash  
Balance at the end of the year   42
Exploration and Evaluation Assets Arising From Acquisition [Member] | Canada [Member] | Lingman Lake [Member]    
Disclosure of Exploration and Evaluation Assets [Line Items]    
Balance at the beginning of the year  
Acquisition costs - cash   15
Balance at the end of the year   15
Exploration and Evaluation Assets Arising From Acquisition [Member] | United States [Member] | Section 35 Property [Member]    
Disclosure of Exploration and Evaluation Assets [Line Items]    
Balance at the beginning of the year   8
Acquisition costs - cash   1
Balance at the end of the year   9
Exploration and Evaluation Assets Arising From Exploration [Member]    
Disclosure of Exploration and Evaluation Assets [Line Items]    
Balance at the beginning of the year 37,924 63,877
Administration 8 11
Corporate social responsibility   1
Property maintenance 28 17
Drilling 172 220
Environment, health & safety   8
Geology 196 129
Geophysics 98 35
Infrastructure  
Write-off (437)  
Increase in exploration and evaluation assets 65 421
Balance at the end of the year 37,989 64,298
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 year 1,498  
Administration  
Property maintenance 6  
Drilling  
Geology 10  
Geophysics 1  
Infrastructure  
Write-off  
Increase in exploration and evaluation assets 17  
Balance at the end of the year 1,515  
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 year 233  
Administration  
Property maintenance 5  
Drilling  
Geology 6  
Geophysics 1  
Infrastructure  
Write-off  
Increase in exploration and evaluation assets 12  
Balance at the end of the year 245  
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 year 39  
Administration  
Property maintenance  
Drilling 6  
Geology 46  
Geophysics 21  
Infrastructure  
Write-off  
Increase in exploration and evaluation assets 73  
Balance at the end of the year 112  
Exploration and Evaluation Assets Arising From Exploration [Member] | Canada [Member] | Enid Creek [Member]    
Disclosure of Exploration and Evaluation Assets [Line Items]    
Balance at the beginning of the year 33  
Administration  
Property maintenance  
Drilling 166  
Geology 83  
Geophysics 72  
Infrastructure  
Write-off (437)  
Increase in exploration and evaluation assets (116)  
Balance at the end of the year (83)  
Exploration and Evaluation Assets Arising From Exploration [Member] | Canada [Member] | Lingman Lake [Member]    
Disclosure of Exploration and Evaluation Assets [Line Items]    
Balance at the beginning of the year 13  
Administration  
Property maintenance  
Drilling  
Geology  
Geophysics  
Infrastructure  
Write-off  
Increase in exploration and evaluation assets  
Balance at the end of the year 13  
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 year 36,108 62,215
Administration 8 9
Corporate social responsibility  
Property maintenance 17 17
Drilling 191
Environment, health & safety   8
Geology 51 105
Geophysics 3 27
Infrastructure  
Write-off  
Increase in exploration and evaluation assets 79 357
Balance at the end of the year $ 36,187 62,572
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 year   1,431
Administration   1
Corporate social responsibility   1
Property maintenance  
Drilling   24
Environment, health & safety  
Geology   15
Geophysics   1
Increase in exploration and evaluation assets   42
Balance at the end of the year   1,473
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 year   209
Administration   1
Corporate social responsibility  
Property maintenance  
Drilling  
Environment, health & safety  
Geology   7
Geophysics   1
Increase in exploration and evaluation assets   9
Balance at the end of the year   218
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 year   22
Administration  
Corporate social responsibility  
Property maintenance  
Drilling   2
Environment, health & safety  
Geology  
Geophysics   4
Increase in exploration and evaluation assets   6
Balance at the end of the year   28
Exploration and Evaluation Assets Arising From Exploration [Member] | Canada [Member] | Lingman Lake [Member]    
Disclosure of Exploration and Evaluation Assets [Line Items]    
Balance at the beginning of the year  
Administration  
Corporate social responsibility  
Property maintenance  
Drilling   3
Environment, health & safety  
Geology  
Geophysics   1
Increase in exploration and evaluation assets   4
Balance at the end of the year   4
Exploration and Evaluation Assets Arising From Exploration [Member] | United States [Member] | Section 35 Property [Member]    
Disclosure of Exploration and Evaluation Assets [Line Items]    
Balance at the beginning of the year  
Administration  
Corporate social responsibility  
Property maintenance  
Drilling  
Environment, health & safety  
Geology   2
Geophysics   1
Increase in exploration and evaluation assets   3
Balance at the end of the year   $ 3