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13. DEFERRED REVENUE (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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DisclosureOfDeferredRevenueLineItems [Line Items] |  |
Current deferred revenue | $ 2,498 | $ 0
Noncurrent deferred revenue | 27,181 | 0
Total deferred revenue | 29,679 | 0
Toll Milling |  |
DisclosureOfDeferredRevenueLineItems [Line Items] |  |
Total deferred revenue | $ 29,679 | $ 0

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