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11. RESTRICTED CASH AND INVESTMENTS (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
DisclosureOfRestrictedCashAndInvestmentsLineItems [Line Items]
Restricted cash and investments	$ 9,712	$ 2,314
Cash and cash equivalents
DisclosureOfRestrictedCashAndInvestmentsLineItems [Line Items]
Restricted cash and investments	2,431	277
Investments
DisclosureOfRestrictedCashAndInvestmentsLineItems [Line Items]
Restricted cash and investments	7,281	2,037
Elliot Lake reclamation trust fund
DisclosureOfRestrictedCashAndInvestmentsLineItems [Line Items]
Restricted cash and investments	2,431	2,213
Letters of credit facility pledged assets
DisclosureOfRestrictedCashAndInvestmentsLineItems [Line Items]
Restricted cash and investments	7,174	0
Letters of credit additional collateral
DisclosureOfRestrictedCashAndInvestmentsLineItems [Line Items]
Restricted cash and investments	$ 107	$ 101

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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 2016-01-13
-Paragraph 55
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2016-03-30&anchor=para_55&doctype=Standard
-URIDate 2016-03-31

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