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Exploration and Evaluation Assets - Schedule of Exploration and Evaluation Assets (Details) - CAD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure of Exploration and Evaluation Assets [Line Items]    
Balance at the beginning of the year $ 38,633  
Acquisition costs - cash
Balance at the end of the year 39,103 38,633
Exploration and Evaluation Assets Arising From Acquisition [Member]    
Disclosure of Exploration and Evaluation Assets [Line Items]    
Balance at the beginning of the year 720 602
Acquisition costs - cash 22 118
Impairment (83)  
Balance at the end of the year 659 720
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 10  
Impairment  
Balance at the end of the year 308 298
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 8  
Impairment  
Balance at the end of the year 238 230
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  
Impairment  
Balance at the end of the year 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 year 83  
Acquisition costs - cash  
Impairment (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 14  
Acquisition costs - cash  
Impairment  
Balance at the end of the year 14 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 11 8
Acquisition costs - cash 3
Impairment  
Balance at the end of the year 11 11
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
Impairment  
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 298 288
Acquisition costs - cash   10
Balance at the end of the year   298
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 230 222
Acquisition costs - cash   8
Balance at the end of the year   230
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 42
Acquisition costs - cash  
Balance at the end of the year   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 year 83
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 14
Acquisition costs - cash   14
Balance at the end of the year   14
Exploration and Evaluation Assets Arising From Exploration [Member]    
Disclosure of Exploration and Evaluation Assets [Line Items]    
Balance at the beginning of the year 37,913 63,877
Administration 12 14
Corporate social responsibility   3
Property maintenance 37 31
Drilling 215 261
Environment, health & safety   8
Geology 242 200
Geophysics 105 39
Helicopter charter aircraft (recovery) 8 (21)
Camp site cleanup 267  
Infrastructure   11
Impairment (355) (26,510)
Increase in exploration and evaluation assets 531 (25,964)
Balance at the end of the year 38,445 37,913
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 2  
Property maintenance 6  
Drilling  
Geology 21  
Geophysics 2  
Helicopter charter aircraft (recovery)  
Camp site cleanup  
Impairment  
Increase in exploration and evaluation assets 31  
Balance at the end of the year 1,529 1,498
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 1  
Property maintenance 5  
Drilling  
Geology 13  
Geophysics  
Camp site cleanup  
Impairment  
Increase in exploration and evaluation assets 19  
Balance at the end of the year 252 233
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 1  
Drilling 5  
Geology 69  
Geophysics 28  
Helicopter charter aircraft (recovery)  
Camp site cleanup  
Impairment  
Increase in exploration and evaluation assets 103  
Balance at the end of the year 142 39
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 year 33  
Administration  
Property maintenance  
Drilling 167  
Geology 83  
Geophysics 72  
Helicopter charter aircraft (recovery)  
Camp site cleanup  
Impairment (355)  
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 13  
Administration  
Property maintenance  
Drilling  
Geology  
Geophysics  
Helicopter charter aircraft (recovery)  
Camp site cleanup  
Increase in exploration and evaluation assets  
Balance at the end of the year 13 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 (11)
Administration
Corporate social responsibility  
Property maintenance
Drilling
Environment, health & safety  
Geology
Geophysics
Helicopter charter aircraft (recovery)
Camp site cleanup  
Infrastructure  
Impairment   (11)
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 36,108 62,215
Administration 9 12
Corporate social responsibility  
Property maintenance 25 17
Drilling 43 197
Environment, health & safety   8
Geology 56 140
Geophysics 3 28
Helicopter charter aircraft (recovery) 8 (21)
Camp site cleanup 267  
Infrastructure   11
Impairment (26,499)
Increase in exploration and evaluation assets 411 (26,107)
Balance at the end of the year 36,519 36,108
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 1,431
Administration   1
Corporate social responsibility   2
Property maintenance   7
Drilling   32
Environment, health & safety  
Geology   24
Geophysics   1
Helicopter charter aircraft (recovery)  
Infrastructure  
Impairment  
Increase in exploration and evaluation assets   67
Balance at the end of the year   1,498
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 233 209
Administration   1
Corporate social responsibility   1
Property maintenance   7
Drilling  
Environment, health & safety  
Geology   14
Geophysics   1
Helicopter charter aircraft (recovery)  
Infrastructure  
Impairment  
Increase in exploration and evaluation assets   24
Balance at the end of the year   233
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 22
Administration  
Corporate social responsibility  
Property maintenance  
Drilling   12
Environment, health & safety  
Geology   1
Geophysics   4
Helicopter charter aircraft (recovery)  
Infrastructure  
Impairment  
Increase in exploration and evaluation assets   17
Balance at the end of the year   39
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 year 33
Administration  
Corporate social responsibility  
Property maintenance  
Drilling   15
Environment, health & safety  
Geology   15
Geophysics   3
Helicopter charter aircraft (recovery)  
Infrastructure  
Impairment  
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 $ 13
Administration  
Corporate social responsibility  
Property maintenance  
Drilling   5
Environment, health & safety  
Geology   6
Geophysics   2
Helicopter charter aircraft (recovery)  
Increase in exploration and evaluation assets   13
Balance at the end of the year   $ 13