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Finance costs and finance income - Finance cost (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Finance Cost and Finance Income [Line Items]
Finance costs	$ 42,173	$ 38,422	$ 34,551
Minera Gold Fields Peru S.A [Member]
Finance Cost and Finance Income [Line Items]
Unwinding of the discount of the provision for mining closure, note 12(b)	36,709	36,015	21,769
Interests on tax contingency and others, see note 24	16,938	161	128
Commissions of guarantee letters	2,485	2,113	1,869
Unwinding of debt instruments, note 13	1,497	735
Finance costs	$ 57,629	$ 39,024	$ 23,766

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Amount of commissions on guarantee letters during the period.

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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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Amount of interest on tax contingency and others.

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Amount of Unwinding of debt instruments incurred during the period.

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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]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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The amount of costs associated with financing activities of the entity.

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