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Subsequent events (Details)
$ / shares in Units, $ in Thousands, $ in Thousands
 6 Months Ended
Oct. 17, 2023
USD ($)
$ / shares
shares
Oct. 09, 2023
USD ($)
Oct. 09, 2023
AUD ($)
Oct. 08, 2023
USD ($)
Oct. 08, 2023
AUD ($)
Jun. 30, 2023
USD ($)
Oct. 13, 2023
shares
Apr. 14, 2023
$ / shares
Subsequent events                
Increase in performance guarantees | $           $ 36,803    
Number of shares issued | shares             1,827,096  
Ordinary shares, Par value (in dollars per share) | $ / shares               $ 0.0001
Proceeds from issue of share capital | $           $ 313,186    
Rehabilitation obligations                
Subsequent events                
Increase in performance guarantees   $ 29,311 $ 44,031 $ 24,500 $ 36,803      
Shares issuance under subscription agreement | Ordinary shares                
Subsequent events                
Number of shares issued | shares 1,827,096              
Ordinary shares, Par value (in dollars per share) | $ / shares $ 0.0001              
Issued price per share | $ / shares $ 11.00              
Proceeds from issue of share capital | $ $ 20,098