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Note 18 - Property, Plant ad Equipment - Non-cash Items Excluded From Acquisition of Property, Plant and Equipment (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Statement Line Items [Line Items]      
Net property, plant and equipment included in prepayments $ 338 $ (1,375) $ (4,272)
Net property, plant and equipment included in trade and other payables 1,606 2,879 $ 2,039
Non-cash items excluded from property, plant and equipment [member]      
Statement Line Items [Line Items]      
Net property, plant and equipment included in prepayments 329 (4,445)  
Net property, plant and equipment included in trade and other payables 583 (1,876)  
Bilboes oxide project payable (note 29) 0 (872)  
Change in estimate for decommissioning asset - adjustment capitalised in property, plant and equipment (note 18) (1,962) 468  
Non-cash items excluded from property, plant and equipment $ (1,050) $ (6,725)