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Finance costs and finance income - Additional information (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	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%
Expense due to unwinding of discount on provisions	$ 36,709,000	$ 36,015,000	$ 21,769,000

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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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The amount, at acquisition date, of contingent consideration arrangements recognised as consideration transferred in a business combination. [Refer: Business combinations [member]]

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The amount of expense recognised due to the unwinding of the discount on provisions, resulting from the effect of the passage of time. [Refer: Other provisions]

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

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