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RESTRICTED CASH AND INVESTMENTS (Tables)
 12 Months Ended
Dec. 31, 2019
Restricted Cash And Investments Tables Abstract  
Restricted cash and investments
        At December 31   At December 31
(in thousands)       2019   2018
             
Cash and cash equivalents     $ 2,859 $ 85
Investments       9,135   12,170
      $ 11,994 $ 12,255
             
Restricted cash and investments-by item:            
Elliot Lake reclamation trust fund     $ 2,859 $ 3,120
Letters of credit facility pledged assets       9,000   9,000
Letters of credit additional collateral       135   135
      $ 11,994 $ 12,255