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RESTRICTED CASH AND INVESTMENTS (Details) - CAD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | ---
DisclosureOfRestrictedCashAndInvestmentsLineItems [Line Items] |  |  |
Restricted cash and investments | $ 11,994 | $ 12,255 | $ 12,184
Cash and cash equivalents |  |  |
DisclosureOfRestrictedCashAndInvestmentsLineItems [Line Items] |  |  |
Restricted cash and investments | 2,859 | 85 | 3,049
Investments |  |  |
DisclosureOfRestrictedCashAndInvestmentsLineItems [Line Items] |  |  |
Restricted cash and investments | 9,135 | 12,170 | 9,135
Elliot Lake reclamation trust fund |  |  |
DisclosureOfRestrictedCashAndInvestmentsLineItems [Line Items] |  |  |
Restricted cash and investments | 2,859 | 3,120 | 3,049
Letters of credit facility pledged assets |  |  |
DisclosureOfRestrictedCashAndInvestmentsLineItems [Line Items] |  |  |
Restricted cash and investments | 9,000 | 9,000 | 9,000
Letters of credit additional collateral |  |  |
DisclosureOfRestrictedCashAndInvestmentsLineItems [Line Items] |  |  |
Restricted cash and investments | $ 135 | $ 135 | $ 135

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