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INCOME TAXES (Details 2) - CAD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | ---
DisclosureOfDeferredIncomeTaxAssetsAndLiabilitiesLineItems [Line Items] |  |  |
Deferred income tax assets-gross | $ 34,902 | $ 31,289 | $ 29,130
Set-off against deferred income tax liabilities | (34,902) | (31,289) | (29,130)
Deferred income tax assets-per balance sheet | 0 | 0 | 0
Deferred income tax liabilities: |  |  |
Deferred income tax liabilities-gross | (43,826) | (44,252) | (46,552)
Set-off of deferred income tax assets | 34,902 | 31,289 | 29,130
Deferred income tax liabilities-per balance sheet | (8,924) | (12,963) | (17,422)
Property, plant and equipment, net |  |  |
DisclosureOfDeferredIncomeTaxAssetsAndLiabilitiesLineItems [Line Items] |  |  |
Deferred income tax assets-gross | 387 | 381 | 977
Deferred income tax liabilities: |  |  |
Deferred income tax liabilities-gross | (41,949) | (42,307) | (44,042)
Post-employment benefits |  |  |
DisclosureOfDeferredIncomeTaxAssetsAndLiabilitiesLineItems [Line Items] |  |  |
Deferred income tax assets-gross | 590 | 600 | 617
Reclamation Obligations |  |  |
DisclosureOfDeferredIncomeTaxAssetsAndLiabilitiesLineItems [Line Items] |  |  |
Deferred income tax assets-gross | 9,561 | 8,798 | 8,296
Tax loss carry forwards |  |  |
DisclosureOfDeferredIncomeTaxAssetsAndLiabilitiesLineItems [Line Items] |  |  |
Deferred income tax assets-gross | 15,827 | 13,346 | 11,718
Other |  |  |
DisclosureOfDeferredIncomeTaxAssetsAndLiabilitiesLineItems [Line Items] |  |  |
Deferred income tax assets-gross | 8,537 | 8,164 | 7,522
Deferred income tax liabilities: |  |  |
Deferred income tax liabilities-gross | (1,135) | (1,203) | (1,132)
Inventory |  |  |
Deferred income tax liabilities: |  |  |
Deferred income tax liabilities-gross | (742) | (742) | (741)
Investments |  |  |
Deferred income tax liabilities: |  |  |
Deferred income tax liabilities-gross | $ 0 | 0 | (651)
Investments in associates |  |  |
Deferred income tax liabilities: |  |  |
Deferred income tax liabilities-gross |  | $ 0 | $ 14

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