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RESTRICTED CASH AND INVESTMENTS (Details) - CAD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Statement [Line Items]    
Restricted cash and investments $ 11,105 $ 12,001
Cash and cash equivalents    
Statement [Line Items]    
Restricted cash and investments 3,133 2,866
Investments    
Statement [Line Items]    
Restricted cash and investments 7,972 9,135
Elliot Lake reclamation trust fund    
Statement [Line Items]    
Restricted cash and investments 3,133 2,866
Letters of credit facility pledged assets    
Statement [Line Items]    
Restricted cash and investments 7,972 9,000
Letters of credit additional collateral    
Statement [Line Items]    
Restricted cash and investments $ 0 $ 135