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Finance income and costs (Details) - USD ($)
$ in Thousands
 6 Months Ended 12 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Dec. 31, 2022
Finance income      
Income from marketable securities $ 5,330 $ 365  
Foreign exchange gain 130    
Total finance income 5,460 365 $ 3,753
Finance costs      
Interest expense under the effective interest rate method on:- Loans and borrowings (2,324)    
Interest expense under the effective interest rate method on:- Other financial liabilities (7,762) (9,830)  
Interest expense under the effective interest rate method on:- Lease liabilities (41)    
Amortisation of discount on convertible promissory note   (8)  
Finance costs (10,127) (9,838) (20,234)
Net change in fair value measurements of financial assets and liabilities      
Net change in fair value of financial instruments (9,558) 733  
Net finance costs (14,225) (8,740) $ (14,997)
Warrant      
Net change in fair value measurements of financial assets and liabilities      
Net change in fair value of financial instruments (13,624) 726  
Embedded derivative - copper and silver stream agreements      
Net change in fair value measurements of financial assets and liabilities      
Net change in fair value of financial instruments 4,789    
Embedded derivative - mezzanine debt facility      
Net change in fair value measurements of financial assets and liabilities      
Net change in fair value of financial instruments $ (723)    
Embedded derivative - conversion option      
Net change in fair value measurements of financial assets and liabilities      
Net change in fair value of financial instruments   $ 7