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Financial Instrument at fair value (Details) - USD ($) $ in Thousands	1 Months Ended	12 Months Ended
	Nov. 30, 2008	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Disclosure Of Available For Sale Financial Assets [Line Items]
Change in fair value of the investments in marketable stocks		$ 821	$ 10
Minera Yanacocha SRL and subsidiary [Member]
Disclosure Of Available For Sale Financial Assets [Line Items]
Purchase of available-for-sale financial assets	$ 13,000
Non-current financial assets available-for-sale		24,417	22,610
Other comprehensive income, net of tax, financial assets measured at fair value through other comprehensive income		$ 1,246	$ 91	$ 3,244

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- Definition

n/a.

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The increase (decrease) in fair value of the investments in marketable stocks.

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- Definition

The amount of non-current financial assets available-for-sale. [Refer: Financial assets available-for-sale; Non-current financial assets]

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The amount of other comprehensive income, net of tax, related to financial assets measured at fair value through other comprehensive income. [Refer: Financial assets measured at fair value through other comprehensive income; Other comprehensive income]

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The cash outflow for the purchase of available-for-sale financial assets. [Refer: Financial assets available-for-sale]

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