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Production costs - Summary of Product Cost (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Expenses by nature [abstract]
Labour	$ 116,653	$ 100,908
Fuel	16,464	12,931
Reagents	53,399	29,871
Electricity	17,904	16,330
Mining contractors	38,240	30,162
Operating and maintenance supplies and services	78,062	63,097
Site general and administrative costs	46,588	42,919
Royalties, production taxes and selling expenses	77,873	38,621
Production costs	$ 445,183	$ 334,839

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Mining contractors expense.

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Royalties, production taxes and selling expenses.

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Site general and administrative costs.

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- Definition

The amount of expense arising from the consumption of energy.

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The amount of expense arising from the consumption of fuel.

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The amount of raw materials and consumables used in the production process or in the rendering of services. [Refer: Current raw materials]

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The amount of expenses incurred for the day-to-day servicing of assets, which may include the cost of labour, consumables or small parts.

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