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Inventories - Additional Information (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Inventory [Line Items] |  |
Cost of inventories recognised as expense during period | $ 321,138 | $ 259,813
Production costs | 334,839 | 269,445
Gold, Lead, and Zinc Concentrate |  |
Inventory [Line Items] |  |
Production costs | 632 | $ 1,465
Depreciation charges | $ 1,894 |

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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 depreciation expense. Depreciation is the systematic allocation of depreciable amounts of tangible assets over their useful lives. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_112_c&doctype=Standard -URIDate 2018-03-16 + Details
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