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Transactions with related companies - Transactions with related parties (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Related Party Transactions [Abstract]
Royalty Expense	$ 11,749	$ 12,832	$ 21,388
Minera Yanacocha SRL and subsidiary [Member]
Related Party Transactions [Abstract]
Royalty Expense		49,000	3,600
Minera Yanacocha SRL and subsidiary [Member] | S.M.R.L. Chaupiloma Dos de Cajamarca [Member]
Related Party Transactions [Abstract]
Royalty Expense	18,638	22,297	20,385
Minera Yanacocha SRL and subsidiary [Member] | Newmont Peru S.R.L [Member]
Services rendered by [Abstract]
Expense arising from exploration for and evaluation of mineral resources	9,017	10,729	12,837
Minera Yanacocha SRL and subsidiary [Member] | Newmont USA Limited [Member]
Services rendered by [Abstract]
Expense arising from exploration for and evaluation of mineral resources	10,214	4,118	5,381
Minera Yanacocha SRL and subsidiary [Member] | Newmont International Services [Member]
Services rendered by [Abstract]
Expense arising from exploration for and evaluation of mineral resources	$ 5,264	$ 10,822	$ 5,181

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- Definition

The amount of expense arising from the search for mineral resources, including minerals, oil, natural gas and similar non-regenerative resources after the entity has obtained legal rights to explore in a specific area, as well as the determination of the technical feasibility and commercial viability of extracting the mineral resource.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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The amount of expense arising from royalties.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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