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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, 2022 | Dec. 31, 2021
Finance costs and finance income |  |
Annual average of future sales of mineral | $ 208,912 | $ 193,972
Useful life of mining properties | 14 years | 14 years
Pre-tax Discount rate (%) | 13.20% | 9.70%

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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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