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INCOME AND MINING TAXES (Details Textual) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Income and mining taxes [Line Items]    
Applicable tax rate 26.30% 26.30%
Unused tax losses for which no deferred tax asset recognised $ 783.9 $ 196.6
Other temporary differences [member]    
Income and mining taxes [Line Items]    
Unused tax losses for which no deferred tax asset recognised 40.3  
Mining Tax [Member]    
Income and mining taxes [Line Items]    
Unused tax losses for which no deferred tax asset recognised $ 634.6 $ 0.0
Scenario, Plan [Member]    
Income and mining taxes [Line Items]    
Applicable tax rate 21.00% 35.00%
Canada [Member] | Unused Capital Losses [Member]    
Income and mining taxes [Line Items]    
Unused Capital Losses For Which No Deferred Tax Assets Recognized $ 146.0  
Canada [Member] | Bottom of range [member] | Unused tax losses [member]    
Income and mining taxes [Line Items]    
Description of expiry date of deductible temporary differences, unused tax losses and unused tax credits 2018  
Canada [Member] | Top of range [member] | Unused tax losses [member]    
Income and mining taxes [Line Items]    
Description of expiry date of deductible temporary differences, unused tax losses and unused tax credits 2036