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DISPOSITION OF DISCONTINUED OPERATIONS - BRALORNE GOLD MINES LTD. (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Statement Line Items [Line Items]      
Cash $ 9,625 $ 3,252  
Plant and equipment 35,658 38,743  
Foreign currency translation adjustments 1,461 $ 270 $ 139
Bralorne Gold Mines Ltd [Member]      
Statement Line Items [Line Items]      
Cash proceeds 6,599    
Talisker shares 2,243    
Talisker warrants 716    
Total proceeds 9,558    
Cash 1,495    
Other current assets 242    
Exploration and evaluation assets 45,613    
Plant and equipment 1,745    
Other long-term assets 19    
Current portion of finance lease obligations and equipment loans (175)    
Non-current portion of finance lease obligations and equipment loans (111)    
Site restoration obligation (10,828)    
Foreign currency translation adjustments (42)    
Total 37,958    
Loss on disposition before selling costs (28,400)    
Selling costs (490)    
Loss on disposition, net $ (28,890)