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Finance costs and finance income - Finance cost (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Finance Cost and Finance Income [Line Items]
Finance costs	$ 37,822	$ 42,173	$ 38,422
Minera Yanacocha SRL and subsidiary [Member]
Finance Cost and Finance Income [Line Items]
Unwinding of the discount of the provision for mining closure, note 12(b)	32,049	36,709	36,015
Commissions of guarantee letters	3,153	2,485	2,113
Unwinding of debt instruments, note 14	1,497	1,497	735
Interests on tax contingency and others, see note 23		16,938	161
Finance costs	$ 36,699	$ 57,629	$ 39,024

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- Definition

Amount of commissions on guarantee letters during the period.

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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]

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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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