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INVENTORIES (Narrative) (Details) - CAD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Inventories [Line Items] |  |
Impairment of inventories | $ 5,353 | $ 5,830
Depletion and amortization [Member] |  |
Inventories [Line Items] |  |
Impairment of inventories | $ 2,216 | $ 2,398

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