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11. RESTRICTED CASH AND INVESTMENTS (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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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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