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DEFERRED REVENUE (Tables)
 12 Months Ended
Dec. 31, 2019
Deferred Revenue Tables Abstract  
Deferred revenue
        At December 31   At December 31
(in thousands)       2019   2018
             
Deferred revenue – pre-sold toll milling:            
CLJV Toll Milling - APG     $ 36,321 $ 37,727
      $ 36,321 $ 37,727
Deferred revenue-by balance sheet presentation:        
Current     $ 4,580 $ 4,567
Non-current       31,741   33,160
      $ 36,321 $ 37,727
Deferred revenue liability continuity
(in thousands)       2019   2018
             
Balance-January 1     $ 37,727 $ 38,652
Revenue earned during the period (note 23)       (4,609)   (4,239)
Accretion       3,203   3,314
Balance-December 31     $ 36,321 $ 37,727