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INCOME TAXES - Disclosure of temporary difference, unused tax losses and unused tax credits (Details) - CAD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Tax loss carryforwards [Member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unused tax losses for which no deferred tax asset recognized $ 55,849 $ 47,199
Exploration and evaluation assets [Member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deductible temporary differences for which no deferred tax asset is recognized 410 595
Other [Member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deductible temporary differences for which no deferred tax asset is recognized $ 1,482 $ 19,192