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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

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

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The percentage of royalty rate determined.

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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
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-IssueDate 2020-01-01
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- Definition

The percentage of voting equity interests acquired in a business combination. [Refer: Business combinations [member]]

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