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Finance costs and finance income - Additional information (Details) - USD ($) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2020 | Dec. 31, 2017 | Aug. 18, 2014
Finance Cost and Finance Income [Line Items] |  |  |
Percentage of voting equity interests acquired |  | 5.00% |
Contingent consideration recognised as of acquisition date | $ 23,026,000 |  |
Royalty rate | 1.50% |  |
Minera Gold Fields Peru S.A [Member] |  |  |
Finance Cost and Finance Income [Line Items] |  |  |
Percentage of voting equity interests acquired |  |  | 51.00%

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- Definition The amount, at acquisition date, of contingent consideration arrangements recognised as consideration transferred in a business combination. [Refer: Business combinations [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 3 -IssueDate 2020-01-01 -Paragraph B64 -Subparagraph g -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=3&code=ifrs-tx-2020-en-r&anchor=para_B64_g_i&doctype=Appendix&subtype=B -URIDate 2020-01-01 + Details
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