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Transactions with associates companies - Additional information (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Disclosure Of Transactions with associates companies [Line Items]
LIBOR interest rate on accounts receivable	6.25%
Related parties [member]
Disclosure Of Transactions with associates companies [Line Items]
Amounts receivable, related party transactions	$ 7,000	$ 31,000
Minera Yanacocha S.R.L. [Member]
Disclosure Of Transactions with associates companies [Line Items]
Royalty percentage	3

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The amounts receivable resulting from related party transactions. [Refer: Related parties [member]]

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