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DEFERRED REVENUE (Details) - CAD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | ---
DisclosureOfDeferredRevenueLineItems [Line Items] |  |  |
Current deferred revenue | $ 4,580 | $ 4,567 | $ 4,936
Noncurrent deferred revenue | 31,741 | 33,160 | 33,716
Total deferred revenue | 36,321 | 37,727 | 38,652
Pre-sold toll milling |  |  |
DisclosureOfDeferredRevenueLineItems [Line Items] |  |  |
Total deferred revenue | $ 36,321 | $ 37,727 | $ 38,652

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