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Inventories - Additional Information (Detail) - USD ($) | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Inventory [Line Items] |  |
Cost of materials and supplies consumed | $ 87,269,000 | $ 120,422,000
Inventory write-down | 1,465,000 | 444,000
Zinc [member] |  |
Inventory [Line Items] |  |
Inventory write-down | 269,000 | 444,000
Pyrite [Member] |  |
Inventory [Line Items] |  |
Inventory write-down | $ 1,196,000 | $ 0

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- Definition The amount of inventories recognised as an expense during the period. [Refer: Inventories] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 2 -IssueDate 2018-01-01 -Paragraph 36 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=2&date=2018-03-01&anchor=para_36_d&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The amount of expense recognised related to the write-down of inventories to net realisable value. [Refer: Inventories] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 2 -IssueDate 2018-01-01 -Paragraph 36 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=2&date=2018-03-01&anchor=para_36_e&doctype=Standard -URIDate 2018-03-16 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 98 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_98_a&doctype=Standard -URIDate 2018-03-16 + Details
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- Details
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Balance Type: |
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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |