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Finance costs and finance income - Unobservable valuation inputs (Details) - USD ($) $ in Thousands | 12 Months Ended
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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. + References No definition available. + Details
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- Definition Discount rate in significant unobservable valuation. + References No definition available. + Details
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- Definition The useful life of mining properties in significant unobservable valuation inputs. + References No definition available. + Details
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