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Finance costs and finance income - Unobservable valuation inputs (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Finance costs and finance income
Annual average of future sales of mineral	$ 222,238	$ 190,815
Useful life of mining properties	0 years	14 years
Pre-tax Discount rate (%)	9.30%	10.00%

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- Definition

The annual average future sales of mineral in significant unobservable valuation inputs.

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Discount rate in significant unobservable valuation.

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The useful life of mining properties in significant unobservable valuation inputs.

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