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DEFERRED REVENUE (Tables)
12 Months Ended
Dec. 31, 2018
Deferred Revenue Tables Abstract  
Deferred revenue
    At December 31   At December 31   At January 1
(in thousands)   2018   2017   2017
             
Deferred revenue – pre-sold toll milling $ 37,727 $ 38,652 $ -
  $ 37,727 $ 38,652 $ -
             
Deferred revenue-by balance sheet presentation:        
Current $ 4,567 $ 4,936 $ -
Non-current   33,160   33,716   -
  $ 37,727 $ 38,652 $ -
Deferred revenue liability continuity
(in thousands)       2018   2017
             
Balance-January 1     $ 38,652 $ -
Proceeds of APG Arrangement, net        
Upfront proceeds   -   43,500
Less: toll milling cash receipts from July 1, 2016 to January 31, 2017 -   (3,520)
Revenue earned during the period       (4,239)   (4,443)
Accretion       3,314   3,115
Balance-December 31     $ 37,727 $ 38,652