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Property, plant and equipment (Narrative) (Details) - USD ($) $ in Thousands |  | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Mar. 02, 2017 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2018 | Jul. 01, 2018 | Apr. 01, 2018 | Jan. 01, 2018 | Dec. 01, 2017
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |  |  |  |
Borrowing costs capitalized as property, plant and equipment |  | $ 700 |  |  |  |  |  |
Net book value transferred from non-producing properties to mining interests, net of pre-commercial production revenue |  | 31,600 |  |  |  |  |  |
Pre-commercial production revenue |  | 4,000 |  |  |  |  |  |
Impairment of property, plant and equipment |  | 204 |  |  |  |  |  |
Historical carrying value |  | $ 25,200 |  |  |  |  |  |
Santacruz Silver Mining Ltd [Member] |  |  |  |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |  |  |  |
Cash consideration | $ 15,000 |  |  |  |  |  |  |
Initial option payment | 5,000 |  |  |  |  |  |  |
Hochschild [Member] |  |  |  |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |  |  |  |
Initial option payment | 2,000 |  |  |  |  |  |  |
Final option payment | $ 8,000 |  |  |  |  |  |  | $ 8,000
Hochschild [Member] | Events After Reporting Period [Member] |  |  |  |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |  |  |  |
Final option payment |  |  |  | $ 6,000 | $ 1,000 | $ 500 | $ 500 |

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- Definition The amount of interest and other costs that an entity incurs in connection with the borrowing of funds that are directly attributable to the acquisition, construction or production of a qualifying asset and which form part of the cost of that asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 23 -IssueDate 2017-01-01 -Paragraph 26 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=23&date=2017-03-01&anchor=para_26_a&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The carrying amount of financial assets that have been reclassified out of the fair value through profit or loss category. [Refer: Financial assets at fair value through profit or loss] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2018-01-01 -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph 12A -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-02&anchor=para_12A_b&doctype=Standard&book=B -URIDate 2017-03-09 + Details
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- Definition The amount of impairment loss recognised in profit or loss for property, plant and equipment. [Refer: Impairment loss recognised in profit or loss; 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 v -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=16&date=2017-03-01&anchor=para_73_e_v&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 98 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_98_a&doctype=Standard -URIDate 2017-03-09 + Details
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