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Exploration and Evaluation Assets - Schedule of Exploration and Evaluation Assets (Details) - CAD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Disclosure of Exploration and Evaluation Assets [Line Items]    
Balance at the beginning of the year $ 64,479 $ 50,494
Acquisition costs - cash
Administration
Corporate social responsibility
Drilling expenses
Environment, health & safety
Geology
Geophysics
Helicopter charter aircraft
Infrastructure
Increase in exploration and evaluation assets
Balance at the end of the year 64,738 50,907
Canada [Member] | Post Creek Property [Member]    
Disclosure of Exploration and Evaluation Assets [Line Items]    
Balance at the end of the year 1,737 1,436
Canada [Member] | Halcyon Property [Member]    
Disclosure of Exploration and Evaluation Assets [Line Items]    
Balance at the end of the year 438 412
Canada [Member] | Quetico Claims [Member]    
Disclosure of Exploration and Evaluation Assets [Line Items]    
Balance at the end of the year 64  
United States [Member] | Section 35 Property [Member]    
Disclosure of Exploration and Evaluation Assets [Line Items]    
Balance at the end of the year 11 8
Greenland [Member] | Maniitsoq Property [Member]    
Disclosure of Exploration and Evaluation Assets [Line Items]    
Balance at the end of the year 62,488 49,051
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 10 25
Balance at the end of the year 612 559
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 5 5
Balance at the end of the year 293 283
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 4 4
Balance at the end of the year 226 218
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] | 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 1 2
Balance at the end of the year 9 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 14
Balance at the end of the year 42 50
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 49,960
Administration 1 15
Corporate social responsibility 1  
Drilling expenses 127 209
Environment, health & safety 8  
Geology 85 108
Geophysics 27 40
Helicopter charter aircraft   3
Infrastructure   13
Increase in exploration and evaluation assets 249 388
Balance at the end of the year 64,126 50,348
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
Corporate social responsibility 1  
Drilling expenses 7 5
Environment, health & safety  
Geology 4 10
Geophysics
Helicopter charter aircraft  
Infrastructure  
Increase in exploration and evaluation assets 13 15
Balance at the end of the year 1,444 1,153
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
Corporate social responsibility  
Drilling expenses
Environment, health & safety  
Geology 3 7
Geophysics
Helicopter charter aircraft  
Infrastructure  
Increase in exploration and evaluation assets 3 7
Balance at the end of the year 212 194
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  
Drilling expenses  
Environment, health & safety  
Geology  
Geophysics  
Increase in exploration and evaluation assets  
Balance at the end of the year 22  
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  
Drilling expenses
Environment, health & safety  
Geology 2
Geophysics
Helicopter charter aircraft  
Infrastructure  
Increase in exploration and evaluation assets 2
Balance at the end of the year 2
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 48,635
Administration 15
Corporate social responsibility  
Drilling expenses 120 204
Environment, health & safety 8  
Geology 76 91
Geophysics 27 40
Helicopter charter aircraft   3
Infrastructure   13
Increase in exploration and evaluation assets 231 366
Balance at the end of the year $ 62,446 $ 49,001