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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