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GOODWILL (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
USD ($)
$ / ounce
$ / $
Dec. 31, 2019
USD ($)
Dec. 31, 2016
USD ($)
Disclosure of reconciliation of changes in goodwill [line items]      
Goodwill $ 49,786 $ 49,786  
Seabee      
Disclosure of reconciliation of changes in goodwill [line items]      
Goodwill     $ 49,800
Seabee      
Disclosure of reconciliation of changes in goodwill [line items]      
Commodity price applied to cash flow projections (in USD per ounce) | $ / ounce 1,561    
Foreign exchange rate applied to cash flow projections (in CAD per USD) | $ / $ 1.31    
Discount rate applied to cash flow projections 4.50%