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DEFERRED REVENUE (Details) - CAD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
DisclosureOfDeferredRevenueLineItems [Line Items] |  |  |
Current deferred revenue | $ 3,478 | $ 4,580 |
Noncurrent deferred revenue | 33,139 | 31,741 |
Total deferred revenue | 36,617 | 36,321 | $ 37,727
Pre-sold Toll Milling |  |  |
DisclosureOfDeferredRevenueLineItems [Line Items] |  |  |
Total deferred revenue | $ 36,617 | $ 36,321 |

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