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8. INVENTORIES | 12 Months Ended
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Dec. 31, 2017
Inventories |
INVENTORIES | The inventories balance consists of:
|  |  |  | At December 31 |  | At December 31
(in thousands) |  |  |  | 2017 |  | 2016
Uranium concentrates and work-in-progress |  |  | $ | 419 | $ | 392
Inventory of ore in stockpiles |  |  |  | 1,672 |  | 1,562
Mine and mill supplies |  |  |  | 2,334 |  | 1,989
|  |  | $ | 4,425 | $ | 3,943
Inventories-by duration: |  |  |  |  |  |
Current |  |  | $ | 2,753 | $ | 2,381
Long term-ore in stockpiles |  |  |  | 1,672 |  | 1,562
|  |  | $ | 4,425 | $ | 3,943
Long-term ore in stockpile inventory represents an estimate of the amount of ore on the stockpile in excess of the next twelve months of planned mill production.

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- Definition The entire disclosure for inventories. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 2 -IssueDate 2016-01-13 -Section Disclosure -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=2&date=2016-03-30&anchor=sect_Disclosure&doctype=Standard -URIDate 2016-03-31 + Details
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