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INCOME TAXES (Details 2) - CAD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
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DisclosureOfDeferredIncomeTaxAssetsAndLiabilitiesLineItems [Line Items] |  |  |
Deferred income tax assets-gross | $ 31,289 | $ 29,130 | $ 27,859
Set-off against deferred income tax liabilities | (31,289) | (29,130) | (27,859)
Deferred income tax assets-per balance sheet | 0 | 0 | 0
Deferred income tax liabilities: |  |  |
Deferred income tax liabilities-gross | (44,252) | (46,552) | (48,027)
Set-off of deferred income tax assets | 31,289 | 29,130 | 27,859
Deferred income tax liabilities-per balance sheet | (12,963) | (17,422) | (20,168)
Property, plant and equipment, net |  |  |
DisclosureOfDeferredIncomeTaxAssetsAndLiabilitiesLineItems [Line Items] |  |  |
Deferred income tax assets-gross | 381 | 977 | 889
Deferred income tax liabilities: |  |  |
Deferred income tax liabilities-gross | (42,313) | (44,042) | (45,581)
Post-employment benefits |  |  |
DisclosureOfDeferredIncomeTaxAssetsAndLiabilitiesLineItems [Line Items] |  |  |
Deferred income tax assets-gross | 600 | 617 | 645
Reclamation Obligations |  |  |
DisclosureOfDeferredIncomeTaxAssetsAndLiabilitiesLineItems [Line Items] |  |  |
Deferred income tax assets-gross | 8,798 | 8,296 | 8,217
Other liabilities |  |  |
DisclosureOfDeferredIncomeTaxAssetsAndLiabilitiesLineItems [Line Items] |  |  |
Deferred income tax assets-gross | 0 | 0 | 237
Tax loss carry forwards |  |  |
DisclosureOfDeferredIncomeTaxAssetsAndLiabilitiesLineItems [Line Items] |  |  |
Deferred income tax assets-gross | 13,346 | 11,718 | 11,790
Other |  |  |
DisclosureOfDeferredIncomeTaxAssetsAndLiabilitiesLineItems [Line Items] |  |  |
Deferred income tax assets-gross | 8,164 | 7,522 | 6,081
Deferred income tax liabilities: |  |  |
Deferred income tax liabilities-gross | (1,203) | (1,132) | (1,254)
Inventory |  |  |
Deferred income tax liabilities: |  |  |
Deferred income tax liabilities-gross | (742) | (741) | (744)
Investments |  |  |
Deferred income tax liabilities: |  |  |
Deferred income tax liabilities-gross | 29 | (651) | (368)
Investments in associates |  |  |
Deferred income tax liabilities: |  |  |
Deferred income tax liabilities-gross | $ (23) | $ 14 | $ (80)

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