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Exploration and Evaluation Assets - Schedule of Exploration and Evaluation Assets (Details) - CAD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2018
Jun. 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 expenses
Camp operations
Helicopter charter aircraft
Geology
Geophysics
Infrastructure
Technical studies
Increase in exploration and evaluation assets
Balance at the end of the year 55,110 41,596
Canada [Member] | Post Creek Property [Member]    
Disclosure of Exploration and Evaluation Assets [Line Items]    
Balance at the end of the year 1,442 1,393
Canada [Member] | Halcyon Property [Member]    
Disclosure of Exploration and Evaluation Assets [Line Items]    
Balance at the end of the year 415 385
Canada [Member] | Quetico Claims [Member]    
Disclosure of Exploration and Evaluation Assets [Line Items]    
Balance at the end of the year 51  
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 53,194 39,812
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 66 28
Administration
Corporate social responsibility
Environment, health & safety
Property maintenance
Drilling expenses
Camp operations
Helicopter charter aircraft
Geology
Geophysics
Infrastructure  
Technical studies
Increase in exploration and evaluation assets
Balance at the end of the year 600 525
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 5 5
Administration
Corporate social responsibility
Environment, health & safety
Property maintenance
Drilling expenses
Camp operations
Helicopter charter aircraft
Geology
Geophysics
Infrastructure  
Technical studies
Increase in exploration and evaluation assets
Balance at the end of the year 283 273
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 4 4
Administration
Corporate social responsibility
Environment, health & safety
Property maintenance
Drilling expenses
Camp operations
Helicopter charter aircraft
Geology
Geophysics
Infrastructure  
Technical studies
Increase in exploration and evaluation assets
Balance at the end of the year 218 210
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 expenses  
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 expenses
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 15 16
Administration
Corporate social responsibility
Environment, health & safety
Property maintenance
Drilling expenses
Camp operations
Helicopter charter aircraft
Geology
Geophysics
Infrastructure  
Technical studies
Increase in exploration and evaluation assets
Balance at the end of the year 51 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 260 208
Corporate social responsibility 2 12
Environment, health & safety 29 40
Property maintenance 19 7
Drilling expenses 1,155 805
Camp operations 1,116 744
Helicopter charter aircraft 1,268 783
Geology 341 329
Geophysics 340 251
Infrastructure 13  
Technical studies 7 47
Increase in exploration and evaluation assets 4,550 3,226
Balance at the end of the year 54,510 41,071
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
Corporate social responsibility 1
Environment, health & safety
Property maintenance
Drilling expenses 5
Camp operations
Helicopter charter aircraft  
Geology 15 34
Geophysics 1
Infrastructure  
Technical studies
Increase in exploration and evaluation assets 21 35
Balance at the end of the year 1,159 1,120
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
Corporate social responsibility
Environment, health & safety
Property maintenance
Drilling expenses
Camp operations
Helicopter charter aircraft
Geology 10 2
Geophysics
Infrastructure  
Technical studies
Increase in exploration and evaluation assets 10 2
Balance at the end of the year 197 175
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  
Corporate social responsibility  
Environment, health & safety  
Property maintenance 1  
Drilling expenses  
Camp operations  
Helicopter charter aircraft  
Geology 9  
Geophysics 1  
Infrastructure  
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] | 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 expenses
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 260 208
Corporate social responsibility 1 12
Environment, health & safety 29 40
Property maintenance 18 7
Drilling expenses 1,150 805
Camp operations 1,116 744
Helicopter charter aircraft 1,268 783
Geology 307 293
Geophysics 339 250
Infrastructure 13  
Technical studies 7 47
Increase in exploration and evaluation assets 4,508 3,189
Balance at the end of the year $ 53,143 $ 39,776