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RESTRICTED CASH AND INVESTMENTS (Details) - CAD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | ---
DisclosureOfRestrictedCashAndInvestmentsLineItems [Line Items] |  |  |
Restricted cash and investments | $ 12,255 | $ 12,184 | $ 3,107
Cash and cash equivalents |  |  |
DisclosureOfRestrictedCashAndInvestmentsLineItems [Line Items] |  |  |
Restricted cash and investments | 85 | 3,049 | 372
Investments |  |  |
DisclosureOfRestrictedCashAndInvestmentsLineItems [Line Items] |  |  |
Restricted cash and investments | 12,170 | 9,135 | 2,735
Elliot Lake reclamation trust fund |  |  |
DisclosureOfRestrictedCashAndInvestmentsLineItems [Line Items] |  |  |
Restricted cash and investments | 3,120 | 3,049 | 3,972
Letters of credit facility pledged assets |  |  |
DisclosureOfRestrictedCashAndInvestmentsLineItems [Line Items] |  |  |
Restricted cash and investments | 9,000 | 9,000 | 0
Letters of credit additional collateral |  |  |
DisclosureOfRestrictedCashAndInvestmentsLineItems [Line Items] |  |  |
Restricted cash and investments | $ 135 | $ 135 | $ 135

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- Definition The amount of cash and cash equivalents whose use or withdrawal is restricted. [Refer: Cash and cash equivalents] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_55&doctype=Standard -URIDate 2018-03-16 + Details
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