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Mineral Properties, Plant and Equipment - Additional Information (Details) - USD ($) |  |  | 12 Months Ended
--- | --- | --- | ---
May 18, 2018 | Jan. 31, 2018 | Dec. 31, 2018 | Dec. 31, 2017
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |
Additions |  |  | $ 149,020,000 | $ 148,102,000
Reversals of impairment |  |  | (27,789,000) | 61,554,000
Gains on sale of mineral properties, plant and equipment (Note 11) |  |  | 7,973,000 | 191,000
Calcatreu project [member] |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |
Reversals of impairment |  |  | 0 | $ 1,317,000
Other disposals of assets [member] | Minera Aquiline Argentina SA [Member] |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |
Percent of shares of Minera Aquiline Argentina SA sold (percent) |  | 100.00% |  |
Consideration for held-for-sale assets sold |  | $ 15,000,000 |  |
Proceeds from disposal of non-current assets or disposal groups classified as held for sale and discontinued operations | $ 10,000,000 | $ 5,000,000 |  |
Gains on sale of mineral properties, plant and equipment (Note 11) |  |  | 8,000,000 |
Gain on disposals of property, plant and equipment, net of tax expense |  |  | $ 6,000,000 |

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- Definition The amount of additions to property, plant and equipment other than those acquired through business combinations. [Refer: Business combinations [member]; Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2017-01-01 -Paragraph 73 -Subparagraph e -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=16&date=2017-03-01&anchor=para_73_e_i&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The gain on the disposal of property, plant and equipment. [Refer: Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 98 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_98_c&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The amount of reversal of impairment loss recognised in profit or loss. [Refer: Reversal of impairment loss; Profit (loss)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 36 -IssueDate 2017-01-01 -Paragraph 126 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=36&date=2017-03-01&anchor=para_126_b&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 36 -IssueDate 2017-01-01 -Paragraph 129 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=36&date=2017-03-01&anchor=para_129_b&doctype=Standard -URIDate 2017-03-09 + Details
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