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Exploration and Evaluation Assets - Schedule of Exploration and Evaluation Assets (Details) - CAD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Disclosure of Exploration and Evaluation Assets [Line Items]    
Balance at the beginning of the year
Acquisition costs - cash
Administration
Corporate social responsibility
Environment, health & safety
Property maintenance
Drilling
Camp operations
Helicopter charter aircraft
Geology
Geophysics
Infrastructure
Technical studies
Increase in exploration and evaluation assets
Balance at the end of the year 63,080 48,970
Canada [Member] | Post Creek Property [Member]    
Disclosure of Exploration and Evaluation Assets [Line Items]    
Balance at the end of the year 1,459 1,406
Canada [Member] | Halcyon Property [Member]    
Disclosure of Exploration and Evaluation Assets [Line Items]    
Balance at the end of the year 428 393
Canada [Member] | Quetico Claims [Member]    
Disclosure of Exploration and Evaluation Assets [Line Items]    
Balance at the end of the year 61  
US [Member] | Section 35 Property [Member]    
Disclosure of Exploration and Evaluation Assets [Line Items]    
Balance at the end of the year 8 6
Greenland [Member] | Maniitsoq Property [Member]    
Disclosure of Exploration and Evaluation Assets [Line Items]    
Balance at the end of the year 61,852 47,165
Exploration and Evaluation Assets Arising From Acquisition [Member]    
Disclosure of Exploration and Evaluation Assets [Line Items]    
Balance at the beginning of the year 534 497
Acquisition costs - cash 78 37
Administration
Corporate social responsibility
Environment, health & safety
Property maintenance
Drilling
Camp operations
Helicopter charter aircraft
Geology
Geophysics
Infrastructure
Technical studies
Increase in exploration and evaluation assets
Balance at the end of the year 612 534
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 278 268
Acquisition costs - cash 10 10
Administration
Corporate social responsibility
Environment, health & safety
Property maintenance
Drilling
Camp operations
Helicopter charter aircraft
Geology
Geophysics
Infrastructure
Technical studies
Increase in exploration and evaluation assets
Balance at the end of the year 288 278
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 214 206
Acquisition costs - cash 8 8
Administration
Corporate social responsibility
Environment, health & safety
Property maintenance
Drilling
Camp operations
Helicopter charter aircraft
Geology
Geophysics
Infrastructure
Technical studies
Increase in exploration and evaluation assets
Balance at the end of the year 222 214
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  
Acquisition costs - cash 40  
Administration  
Corporate social responsibility  
Environment, health & safety  
Property maintenance  
Drilling  
Camp operations  
Helicopter charter aircraft  
Geology  
Geophysics  
Infrastructure  
Technical studies  
Increase in exploration and evaluation assets  
Balance at the end of the year 40  
Exploration and Evaluation Assets Arising From Acquisition [Member] | US [Member] | Section 35 Property [Member]    
Disclosure of Exploration and Evaluation Assets [Line Items]    
Balance at the beginning of the year 6 3
Acquisition costs - cash 2 3
Administration
Corporate social responsibility
Environment, health & safety
Property maintenance
Drilling
Camp operations
Helicopter charter aircraft
Geology
Geophysics
Infrastructure
Technical studies
Increase in exploration and evaluation assets
Balance at the end of the year 8 6
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 36 20
Acquisition costs - cash 18 16
Administration
Corporate social responsibility
Environment, health & safety
Property maintenance
Drilling
Camp operations
Helicopter charter aircraft
Geology
Geophysics
Infrastructure
Technical studies
Increase in exploration and evaluation assets
Balance at the end of the year 54 36
Exploration and Evaluation Assets Arising From Exploration [Member]    
Disclosure of Exploration and Evaluation Assets [Line Items]    
Balance at the beginning of the year 49,960 37,845
Administration 482 403
Corporate social responsibility 59 33
Environment, health & safety 137 92
Property maintenance 20 7
Drilling 3,922 2,969
Camp operations 2,942 2,305
Helicopter charter aircraft 4,168 2,993
Geology 694 608
Geophysics 762 950
Infrastructure 31 183
Technical studies 19 48
Increase in exploration and evaluation assets 13,236 10,591
Balance at the end of the year 63,196 48,436
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 1,138 1,085
Administration 2
Corporate social responsibility 1
Environment, health & safety
Property maintenance 1
Drilling 5
Camp operations
Helicopter charter aircraft
Geology 24 40
Geophysics 1
Infrastructure
Technical studies 2
Increase in exploration and evaluation assets 33 43
Balance at the end of the year 1,171 1,128
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 187 173
Administration 2
Corporate social responsibility 1
Environment, health & safety
Property maintenance 1
Drilling
Camp operations
Helicopter charter aircraft
Geology 15 6
Geophysics
Infrastructure
Technical studies
Increase in exploration and evaluation assets 19 6
Balance at the end of the year 206 179
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  
Administration 2  
Corporate social responsibility  
Environment, health & safety  
Property maintenance 1  
Drilling  
Camp operations  
Helicopter charter aircraft  
Geology 17  
Geophysics 1  
Infrastructure  
Technical studies  
Increase in exploration and evaluation assets 21  
Balance at the end of the year 21  
Exploration and Evaluation Assets Arising From Exploration [Member] | US [Member] | Section 35 Property [Member]    
Disclosure of Exploration and Evaluation Assets [Line Items]    
Balance at the beginning of the year
Administration
Corporate social responsibility
Environment, health & safety
Property maintenance
Drilling
Camp operations
Helicopter charter aircraft
Geology
Geophysics
Infrastructure
Technical studies
Increase in exploration and evaluation assets  
Balance at the end of the year 8
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 48,635 36,587
Administration 476 403
Corporate social responsibility 57 33
Environment, health & safety 137 92
Property maintenance 17 7
Drilling 3,917 2,969
Camp operations 2,942 2,305
Helicopter charter aircraft 4,168 2,993
Geology 638 562
Geophysics 761 949
Infrastructure 31 183
Technical studies 19 46
Increase in exploration and evaluation assets 13,163 10,542
Balance at the end of the year $ 61,798 $ 47,129