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INCOME TAXES (Details 2) - CAD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
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DisclosureOfDeferredIncomeTaxAssetsAndLiabilitiesLineItems [Line Items] |  |  |
Deferred income tax assets-gross | $ 37,141 | $ 34,902 |
Set-off against deferred income tax liabilities | (37,141) | (34,902) |
Deferred income tax assets-per balance sheet | 0 | 0 |
Deferred income tax liabilities: |  |  |
Deferred income tax liabilities-gross | (46,333) | (43,826) |
Set-off of deferred income tax assets | 37,141 | 34,902 |
Deferred income tax liabilities-per balance sheet | (9,192) | (8,924) | $ (12,963)
Plant and Equipment |  |  |
DisclosureOfDeferredIncomeTaxAssetsAndLiabilitiesLineItems [Line Items] |  |  |
Deferred income tax assets-gross | 387 | 387 |
Deferred income tax liabilities: |  |  |
Deferred income tax liabilities-gross | (44,436) | (41,949) |
Post-employment Benefits |  |  |
DisclosureOfDeferredIncomeTaxAssetsAndLiabilitiesLineItems [Line Items] |  |  |
Deferred income tax assets-gross | 355 | 590 |
Reclamation Obligations |  |  |
DisclosureOfDeferredIncomeTaxAssetsAndLiabilitiesLineItems [Line Items] |  |  |
Deferred income tax assets-gross | 11,709 | 9,561 |
Tax Loss Carry Forwards |  |  |
DisclosureOfDeferredIncomeTaxAssetsAndLiabilitiesLineItems [Line Items] |  |  |
Deferred income tax assets-gross | 16,943 | 15,827 |
Other |  |  |
DisclosureOfDeferredIncomeTaxAssetsAndLiabilitiesLineItems [Line Items] |  |  |
Deferred income tax assets-gross | 7,747 | 8,537 |
Deferred income tax liabilities: |  |  |
Deferred income tax liabilities-gross | (1,140) | (1,135) |
Inventory |  |  |
Deferred income tax liabilities: |  |  |
Deferred income tax liabilities-gross | $ (757) | $ (742) |

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