DECOMMISSIONING AND RESTORATION LIABILITY (Details 1) - CAD ($) $ in Thousands	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016
Disclosure Of Decommissioning And Restoration Liability [Abstract]
Balance, beginning of year	$ 24,266	$ 23,045
Change in estimate of discounted cash flows	4,372	726
Accretion recorded during the year	562	495
Balance, end of the year	$ 29,200	$ 24,266

The amount of non-current provision for decommissioning, restoration and rehabilitation costs. [Refer: Provision for decommissioning, restoration and rehabilitation costs]

Reference 1: http://www.xbrl.org/2003/role/exampleRef
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Reference 2: http://www.xbrl.org/2003/role/exampleRef
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