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Finance costs and finance income - Unobservable valuation inputs (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Finance costs and finance income
Annual average of future sales of mineral	$ 190,815	$ 193,906
Useful life of mining properties	14 years	13 years
Pre-tax Discount rate (%)	10.00%	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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