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INVENTORIES (Tables)
12 Months Ended
Dec. 31, 2018
Inventories Tables Abstract  
Inventories
    At December 31   At December 31   At January 1
(in thousands)   2018   2017   2017
             
Uranium concentrates $ 526 $ 526 $ 526
Inventory of ore in stockpiles   2,098   2,098   2,098
Mine and mill supplies in MLJV   3,058   2,928   2,670
  $ 5,682 $ 5,552 $ 5,294
             
Inventories-by balance sheet presentation:            
Current $ 3,584 $ 3,454 $ 3,196
Long term-ore in stockpiles   2,098   2,098   2,098
  $ 5,682 $ 5,552 $ 5,294