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COMMITMENTS AND CONTINGENCIES - Lease Obligations and Purchase Commitments (Details)
CAD in Thousands, $ in Thousands
 12 Months Ended
Dec. 19, 2017
CAD
Dec. 19, 2017
USD ($)
Sep. 22, 2017
USD ($)
Dec. 31, 2017
USD ($)
Operating lease obligations (office rent)        
2018       $ 400
2019       368
2020       300
2021       240
2022       230
Thereafter       197
Total       1,735
Operating lease obligations (mining and surface rights)        
2018       3,994
2019       436
2020       442
2021       442
2022       437
Total       5,751
Exploration        
2018       11,554
Total       11,554
Construction        
2018       11,344
Total       11,344
Reclamation costs        
2018       639
2019       448
2020       3,883
2021       3,974
2022       3,181
Thereafter       30,807
Total       42,932
Total        
2018       27,931
2019       1,252
2020       4,625
2021       4,656
2022       3,848
Thereafter       31,004
Total       73,316
Shares issued in connection with the equity issuance     $ 43,200  
Flow Through Common Shares        
Total        
Shares issued in connection with the equity issuance CAD 12,880 $ 10,000   $ 7,799