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Share-based payments - Summary of share-based payments (Detail)
 12 Months Ended
Jun. 30, 2023
$ / shares
Jun. 30, 2023
$ / shares
Jun. 30, 2023
$ / shares
Jun. 30, 2023
shares
$ / shares
Jun. 30, 2022
$ / shares
Disclosure of terms and conditions of share-based payment arrangement [line items]          
Balance at the start of the year, share options     8,655,500   4,219,000
Granted, share options     7,930,000 7,930,000 4,800,000
Forfeited, share options     (1,550,000)    
Exercised, share options         (25,000)
Expired / lapsed on termination of employment     (1,805,500)   (338,500)
Expired / lapsed on termination of employment     (255,500)   (338,500)
Balance at the end of the year, share options     14,780,000   8,655,500
Exercisable at the end of the financial year, share option 6,483,333 6,483,333 6,483,333 6,483,333 3,180,500
Balance at the start of the year, Weighted average exercise price   $ 1.2826     $ 0.8911
Granted, Weighted average exercise price   0.1785     1.611
Forfeited, Weighted average exercise price   1.8977     0
Exercised, Weighted average exercise price   0     0.67
Expired, Weighted average exercise price   1.8977     1.1123
Balance at the end of the year, Weighted average exercise price   0.6292     1.2826
Exercisable at the end of the financial year, Weighted average exercise price $ 0.9572 0.9572 $ 0.9572 $ 0.9572 $ 0.877
Tranche 1 [member]          
Disclosure of terms and conditions of share-based payment arrangement [line items]          
Grant date         05/09/2016
Expiry date         Sep. 05, 2021
Exercise price         $ 1.63
Balance at the start of the year, share options         50,000
Expired / lapsed on termination of employment         (50,000)
Tranche 2 [member]          
Disclosure of terms and conditions of share-based payment arrangement [line items]          
Grant date         12/10/2016
Expiry date         Oct. 17, 2021
Exercise price         $ 1.56
Balance at the start of the year, share options         62,000
Expired / lapsed on termination of employment         (62,000)
Tranche 3 [member]          
Disclosure of terms and conditions of share-based payment arrangement [line items]          
Grant date         31/10/2016
Expiry date         Nov. 01, 2021
Exercise price         $ 1.38
Balance at the start of the year, share options         12,500
Expired / lapsed on termination of employment         (12,500)
Tranche 4 [member]          
Disclosure of terms and conditions of share-based payment arrangement [line items]          
Grant date         21/11/2016
Expiry date         Nov. 23, 2021
Exercise price         $ 1.38
Balance at the start of the year, share options         50,000
Expired / lapsed on termination of employment         (50,000)
Tranche 5 [member]          
Disclosure of terms and conditions of share-based payment arrangement [line items]          
Grant date 07/08/2017       07/08/2017
Expiry date Aug. 07, 2022       Aug. 07, 2022
Exercise price   0.67     $ 0.67
Balance at the start of the year, share options     15,500   87,000
Exercised, share options         (25,000)
Expired / lapsed on termination of employment     (15,500)   (46,500)
Balance at the end of the year, share options         15,500
Tranche 6 [member]          
Disclosure of terms and conditions of share-based payment arrangement [line items]          
Grant date 05/02/2018       05/02/2018
Expiry date Feb. 05, 2023       Feb. 05, 2023
Exercise price   0.7802     $ 0.78
Balance at the start of the year, share options     240,000   320,000
Expired / lapsed on termination of employment     (240,000)   (80,000)
Balance at the end of the year, share options         240,000
Tranche 7 [member]          
Disclosure of terms and conditions of share-based payment arrangement [line items]          
Grant date         04/01/2019
Expiry date         Jan. 04, 2024
Exercise price         $ 0.4925
Balance at the start of the year, share options         37,500
Expired / lapsed on termination of employment         (37,500)
Tranche 8 [member]          
Disclosure of terms and conditions of share-based payment arrangement [line items]          
Grant date 13/11/2019       13/11/2019
Expiry date Jan. 04, 2024       Nov. 13, 2023
Exercise price   0.4925     $ 0.4925
Balance at the start of the year, share options     1,200,000   1,200,000
Balance at the end of the year, share options     1,200,000   1,200,000
Tranche 9 [member]          
Disclosure of terms and conditions of share-based payment arrangement [line items]          
Grant date 13/01/2020       13/01/2020
Expiry date Jan. 13, 2025       Jan. 13, 2025
Exercise price   0.8812     $ 0.8812
Balance at the start of the year, share options     200,000   200,000
Expired / lapsed on termination of employment     (12,500)    
Balance at the end of the year, share options     187,500   200,000
Tranche 10 [member]          
Disclosure of terms and conditions of share-based payment arrangement [line items]          
Grant date 09/11/2020       09/11/2020
Expiry date Nov. 09, 2024       Nov. 09, 2024
Exercise price   1.132     $ 1.132
Balance at the start of the year, share options     1,200,000   1,200,000
Balance at the end of the year, share options     1,200,000   1,200,000
Tranche 11 [member]          
Disclosure of terms and conditions of share-based payment arrangement [line items]          
Grant date 09/11/2020       09/11/2020
Expiry date Jan. 13, 2025       Nov. 09, 2024
Exercise price   0.8812     $ 0.8812
Balance at the start of the year, share options     800,000   800,000
Expired / lapsed on termination of employment     (200,000)    
Balance at the end of the year, share options     600,000   800,000
Tranche 12 [member]          
Disclosure of terms and conditions of share-based payment arrangement [line items]          
Grant date 04/01/2021       04/01/2021
Expiry date Jan. 04, 2025       Jan. 04, 2026
Exercise price   1.69     $ 1.69
Balance at the start of the year, share options     200,000   200,000
Expired / lapsed on termination of employment     (12,500)    
Balance at the end of the year, share options     187,500   200,000
Tranche 13 [member]          
Disclosure of terms and conditions of share-based payment arrangement [line items]          
Grant date 09/09/2021       09/09/2021
Expiry date Jun. 26, 2026       Jun. 26, 2026
Exercise price   1.365     $ 1.37
Balance at the start of the year, share options     100,000    
Granted, share options         100,000
Balance at the end of the year, share options     100,000   100,000
Tranche 14 [member]          
Disclosure of terms and conditions of share-based payment arrangement [line items]          
Grant date 16/11/2021       16/11/2021
Expiry date Nov. 16, 2025       Nov. 16, 2025
Exercise price   1.69     $ 1.69
Balance at the start of the year, share options     1,000,000    
Granted, share options         1,000,000
Expired / lapsed on termination of employment     (250,000)    
Balance at the end of the year, share options     750,000   1,000,000
Tranche 15 [member]          
Disclosure of terms and conditions of share-based payment arrangement [line items]          
Grant date 16/11/2021       16/11/2021
Expiry date Nov. 16, 2025       Nov. 16, 2025
Exercise price   2.24     $ 2.24
Balance at the start of the year, share options     1,500,000    
Granted, share options         1,500,000
Expired / lapsed on termination of employment     (1,000,000)    
Balance at the end of the year, share options     500,000   1,500,000
Tranche 16 [member]          
Disclosure of terms and conditions of share-based payment arrangement [line items]          
Grant date 16/11/2021       16/11/2021
Expiry date Nov. 16, 2026       Nov. 16, 2025
Exercise price   1.56     $ 1.56
Balance at the start of the year, share options     800,000    
Granted, share options         800,000
Balance at the end of the year, share options     800,000   800,000
Tranche 17 [member]          
Disclosure of terms and conditions of share-based payment arrangement [line items]          
Grant date 01/02/2022       01/02/2022
Expiry date Feb. 01, 2027       Feb. 01, 2027
Exercise price   0.94     $ 0.94
Balance at the start of the year, share options     800,000    
Granted, share options         800,000
Balance at the end of the year, share options     800,000   800,000
Tranche 18 [member]          
Disclosure of terms and conditions of share-based payment arrangement [line items]          
Grant date 01/02/2022       01/02/2022
Expiry date Feb. 01, 2027       Feb. 01, 2027
Exercise price   0.94     $ 0.94
Balance at the start of the year, share options     500,000    
Granted, share options         500,000
Expired / lapsed on termination of employment     (75,000)    
Balance at the end of the year, share options     425,000   500,000
Tranche 19 [member]          
Disclosure of terms and conditions of share-based payment arrangement [line items]          
Grant date 24/05/2022       24/05/2022
Expiry date May 24, 2027       May 24, 2027
Exercise price   0.78     $ 0.78
Balance at the start of the year, share options     100,000    
Granted, share options         100,000
Balance at the end of the year, share options     100,000   100,000
Tranche 20 [member]          
Disclosure of terms and conditions of share-based payment arrangement [line items]          
Grant date 03/03/2023        
Expiry date Mar. 03, 2027        
Exercise price   0.15      
Granted, share options     3,930,000    
Balance at the end of the year, share options     3,930,000    
Tranche 21 [member]          
Disclosure of terms and conditions of share-based payment arrangement [line items]          
Grant date 03/05/2023        
Expiry date May 03, 2027        
Exercise price   $ 0.187      
Granted, share options     4,000,000    
Balance at the end of the year, share options     4,000,000