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Exploration and Evaluation Assets - Schedule of Exploration and Evaluation Assets (Details) - CAD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Disclosure of Exploration and Evaluation Assets [Line Items]    
Balance at the beginning of the year $ 64,479  
Geology  
Balance at the end of the year 38,633 $ 64,479
Canada [Member] | Post Creek Property [Member]    
Disclosure of Exploration and Evaluation Assets [Line Items]    
Balance at the beginning of the year 1,719  
Balance at the end of the year 1,796 1,719
Canada [Member] | Halcyon Property [Member]    
Disclosure of Exploration and Evaluation Assets [Line Items]    
Balance at the beginning of the year 431  
Balance at the end of the year 463 431
Canada [Member] | Quetico Claims [Member]    
Disclosure of Exploration and Evaluation Assets [Line Items]    
Balance at the beginning of the year 64  
Balance at the end of the year 81 64
Canada [Member] | Enid Creek [Member]    
Disclosure of Exploration and Evaluation Assets [Line Items]    
Balance at the end of the year 116  
Canada [Member] | Lingman Lake [Member]    
Disclosure of Exploration and Evaluation Assets [Line Items]    
Balance at the end of the year 27  
United States [Member] | Section 35 Property [Member]    
Disclosure of Exploration and Evaluation Assets [Line Items]    
Balance at the beginning of the year 8  
Balance at the end of the year 8
Greenland [Member] | Maniitsoq Property [Member]    
Disclosure of Exploration and Evaluation Assets [Line Items]    
Balance at the beginning of the year 62,257  
Balance at the end of the year 36,150 62,257
Exploration and Evaluation Assets Arising From Acquisition [Member]    
Disclosure of Exploration and Evaluation Assets [Line Items]    
Balance at the beginning of the year 602 534
Acquisition costs - cash 118 68
Balance at the end of the year 720 602
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 288 278
Acquisition costs - cash 10 10
Balance at the end of the year 298 288
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 222 214
Acquisition costs - cash 8 8
Balance at the end of the year 230 222
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 42
Balance at the end of the year 42 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  
Acquisition costs - cash 83  
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  
Acquisition costs - cash 14  
Balance at the end of the year 14
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 6
Acquisition costs - cash 3 2
Balance at the end of the year 11 8
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 36
Acquisition costs - cash 6
Balance at the end of the year 42 42
Exploration and Evaluation Assets Arising From Exploration [Member]    
Disclosure of Exploration and Evaluation Assets [Line Items]    
Balance at the beginning of the year 63,877 602
Administration 14 491
Corporate social responsibility 3 60
Property maintenance 31 22
Drilling expenses 261 4,489
Environment, health & safety 8 135
Geology 200 739
Geophysics 39 854
Camp operations   2,943
Helicopter charter aircraft (21) 4,138
Infrastructure 11 31
Write-off (26,510)  
Technical studies   15
Increase in exploration and evaluation assets (25,964) 13,917
Balance at the end of the year 37,913 63,877
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 1,138
Administration 1 2
Corporate social responsibility 2 1
Property maintenance 7 2
Drilling expenses 32 219
Environment, health & safety
Geology 24 40
Geophysics 1 29
Camp operations  
Helicopter charter aircraft
Infrastructure
Write-off  
Technical studies  
Increase in exploration and evaluation assets 24 293
Balance at the end of the year 233 1,431
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 209 187
Administration 1 2
Corporate social responsibility 1 1
Property maintenance 7 2
Drilling expenses
Environment, health & safety
Geology 14 17
Geophysics 1
Camp operations  
Helicopter charter aircraft
Infrastructure
Write-off  
Technical studies  
Increase in exploration and evaluation assets 24 22
Balance at the end of the year 233 209
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 1
Corporate social responsibility
Property maintenance
Drilling expenses 12
Environment, health & safety
Geology 1 20
Geophysics 4 1
Camp operations  
Helicopter charter aircraft
Infrastructure
Write-off  
Technical studies  
Increase in exploration and evaluation assets 17 22
Balance at the end of the year 39 22
Exploration and Evaluation Assets Arising From Exploration [Member] | Canada [Member] | Enid Creek [Member]    
Disclosure of Exploration and Evaluation Assets [Line Items]    
Administration  
Corporate social responsibility  
Property maintenance  
Drilling expenses  
Environment, health & safety 15  
Geology  
Geophysics 15  
Camp operations 3  
Helicopter charter aircraft  
Infrastructure  
Write-off  
Increase in exploration and evaluation assets 33  
Balance at the end of the year 33  
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 expenses  
Environment, health & safety 5  
Geology  
Geophysics 6  
Helicopter charter aircraft  
Infrastructure  
Write-off  
Increase in exploration and evaluation assets 13  
Balance at the end of the year 13
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 expenses
Environment, health & safety
Geology
Geophysics
Camp operations  
Helicopter charter aircraft
Infrastructure
Write-off  
Technical studies  
Increase in exploration and evaluation assets (11)
Balance at the end of the year (11)
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 62,215 42
Administration 12 486
Corporate social responsibility 58
Property maintenance 17 18
Drilling expenses 197 4,270
Environment, health & safety 8 135
Geology 140 662
Geophysics 28 824
Camp operations   2,943
Helicopter charter aircraft (21) 4,138
Infrastructure 11 31
Write-off (26,499)  
Technical studies   15
Increase in exploration and evaluation assets (26,107) 13,580
Balance at the end of the year $ 36,108 $ 62,215