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SUBSEQUENT EVENT (Details)
 12 Months Ended
Apr. 19, 2018
CAD ($)
$ / shares
shares
Mar. 01, 2018
CAD ($)
Option
Dec. 31, 2017
Option
Dec. 31, 2016
Option
Dec. 31, 2015
Option
Stock Option Plan          
SUBSEQUENT EVENT          
Number of shares granted | Option     9,137,500 6,058,000 1,350,000
Maximum | Stock Option Plan          
SUBSEQUENT EVENT          
Exercisable period (in years)     5 years 5 years 5 years
Major share transaction | Non-brokered private placement          
SUBSEQUENT EVENT          
Units issued (in shares) 233,333,333        
Units issue price (in dollars per unit) | $ / shares $ 0.075        
Gross proceeds from issue of units | $ $ 17,500,000        
Number of common share per unit (in shares) 1        
Number of common share purchase warrant per unit (in shares) 0.5        
Number of shares that the warrants entitle (in shares) 1        
Common share purchase warrant, price per warrant | $ / shares $ 0.12        
Warrant exercise period 24 months        
Major share transaction | Stock Option Plan          
SUBSEQUENT EVENT          
Exercisable period (in years)   5 years      
Exercise price | $   $ 0.12      
Major share transaction | Maximum | Stock Option Plan          
SUBSEQUENT EVENT          
Number of shares granted | Option   5,725,000