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Inventories | 12 Months Ended
--- | ---
Dec. 31, 2017
Classes of current inventories [abstract] |
Inventories | 7. Inventories
|  | December 31, |  |  | December 31, |
|  | 2017 |  |  | 2016 |
Concentrates |  | $ | 1,391 |  |  | $ | 1,266 |
Ore stockpiles |  |  | 2,877 |  |  |  | 161 |
Spare parts and supplies |  |  | 5,098 |  |  |  | 5,191 |
|  | $ | 9,366 |  |  | $ | 6,618 |
The amount of inventories recognized as an expense during the year ended December 31, 2017 was $40.0 million (2016: $46.1 million). During the year ended December 31, 2017, the concentrates and ore stockpiles, and spare parts and supplies write-down to net realizable value included in cost of sales was $0.4 million and $0.3 million, respectively (2016: $1.0 million and $0.1 million, respectively).

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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 2017-01-01 -Section Disclosure -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=2&date=2017-03-01&anchor=sect_Disclosure&doctype=Standard -URIDate 2017-03-09 + Details
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