v3.26.3
Property, Plant and Equipment (Details) - USD ($)
$ in Thousands
 12 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Reconciliation of changes in property, plant and equipment [abstract]    
Balance Beginning [1] $ 312,507  
Balance Ending 499,645 $ 312,507 [1]
Capital expenditure commitments 18,300 12,000
Cost [Member]    
Reconciliation of changes in property, plant and equipment [abstract]    
Balance Beginning 547,655 515,986
Acquisitions through business combinations 38,195  
Additions 30,205 30,459
Changes in closure provision estimate 408 2,100
Disposals (13,973) (701)
Foreign exchange rate differences (21,144) (189)
Transfers and other movements 5,478 0
Balance Ending 586,824 547,655
Accumulated Depreciation and Impairment [Member]    
Reconciliation of changes in property, plant and equipment [abstract]    
Balance Beginning (235,148) (31,036)
Depreciation charge for the year (23,630) (24,983)
Impairment reversal for the year 156,013  
Impairment charge for the year   (175,612)
Disposals 10,418 329
Foreign exchange rate differences 5,168 (3,846)
Transfers and other movements 0 0
Balance Ending (87,179) (235,148)
Land and Buildings [Member]    
Reconciliation of changes in property, plant and equipment [abstract]    
Balance Beginning 15,368  
Balance Ending 74,403 15,368
Land and Buildings [Member] | Cost [Member]    
Reconciliation of changes in property, plant and equipment [abstract]    
Balance Beginning 36,247 32,458
Acquisitions through business combinations 38,159  
Additions 0 0
Changes in closure provision estimate 0 0
Disposals (3,214) 0
Foreign exchange rate differences (1,588) (435)
Transfers and other movements 10,708 4,224
Balance Ending 80,312 36,247
Land and Buildings [Member] | Accumulated Depreciation and Impairment [Member]    
Reconciliation of changes in property, plant and equipment [abstract]    
Balance Beginning (20,879) (881)
Depreciation charge for the year (2,481) (2,408)
Impairment reversal for the year 16,842  
Impairment charge for the year   (16,367)
Disposals 249 0
Foreign exchange rate differences 360 (1,223)
Transfers and other movements 0 0
Balance Ending (5,909) (20,879)
Plant and Equipment [Member]    
Reconciliation of changes in property, plant and equipment [abstract]    
Balance Beginning 89,062  
Balance Ending 177,040 89,062
Plant and Equipment [Member] | Cost [Member]    
Reconciliation of changes in property, plant and equipment [abstract]    
Balance Beginning 243,128 236,884
Acquisitions through business combinations 36  
Additions 0 0
Changes in closure provision estimate 408 2,100
Disposals (10,759) 0
Foreign exchange rate differences (9,111) (464)
Transfers and other movements 13,175 4,608
Balance Ending 236,877 243,128
Plant and Equipment [Member] | Accumulated Depreciation and Impairment [Member]    
Reconciliation of changes in property, plant and equipment [abstract]    
Balance Beginning (154,066) (22,725)
Depreciation charge for the year (18,044) (17,937)
Impairment reversal for the year 98,665  
Impairment charge for the year   (106,681)
Disposals 10,169 0
Foreign exchange rate differences 3,439 (6,723)
Transfers and other movements 0 0
Balance Ending (59,837) (154,066)
Mine Properties [Member]    
Reconciliation of changes in property, plant and equipment [abstract]    
Balance Beginning 125,723  
Balance Ending 159,236 125,723
Mine Properties [Member] | Cost [Member]    
Reconciliation of changes in property, plant and equipment [abstract]    
Balance Beginning 172,050 171,478
Acquisitions through business combinations 0  
Additions 0 42
Changes in closure provision estimate 0 0
Disposals 0 0
Foreign exchange rate differences (6,533) 523
Transfers and other movements 5,478 7
Balance Ending 170,995 172,050
Mine Properties [Member] | Accumulated Depreciation and Impairment [Member]    
Reconciliation of changes in property, plant and equipment [abstract]    
Balance Beginning (46,327) (2,605)
Depreciation charge for the year (3,105) (4,638)
Impairment reversal for the year 36,885  
Impairment charge for the year   (43,895)
Disposals 0 0
Foreign exchange rate differences 788 4,811
Transfers and other movements 0 0
Balance Ending (11,759) (46,327)
Capital Works in Progress [Member]    
Reconciliation of changes in property, plant and equipment [abstract]    
Balance Beginning 14,145  
Balance Ending 23,219 14,145
Capital Works in Progress [Member] | Cost [Member]    
Reconciliation of changes in property, plant and equipment [abstract]    
Balance Beginning 23,612 18,779
Acquisitions through business combinations 0  
Additions 30,205 12,723
Changes in closure provision estimate 0 0
Disposals 0 (372)
Foreign exchange rate differences (1,051) 322
Transfers and other movements (23,954) (7,840)
Balance Ending 28,812 23,612
Capital Works in Progress [Member] | Accumulated Depreciation and Impairment [Member]    
Reconciliation of changes in property, plant and equipment [abstract]    
Balance Beginning (9,467) 0
Depreciation charge for the year 0 0
Impairment reversal for the year 3,621  
Impairment charge for the year   (8,669)
Disposals 0 0
Foreign exchange rate differences 253 (798)
Transfers and other movements 0 0
Balance Ending (5,593) (9,467)
Exploration and Evaluation [Member]    
Reconciliation of changes in property, plant and equipment [abstract]    
Balance Beginning 68,209  
Balance Ending 65,747 68,209
Exploration and Evaluation [Member] | Cost [Member]    
Reconciliation of changes in property, plant and equipment [abstract]    
Balance Beginning 72,618 56,387
Acquisitions through business combinations 0  
Additions 0 17,694
Changes in closure provision estimate 0 0
Disposals 0 (329)
Foreign exchange rate differences (2,861) (135)
Transfers and other movements 71 (999)
Balance Ending 69,828 72,618
Exploration and Evaluation [Member] | Accumulated Depreciation and Impairment [Member]    
Reconciliation of changes in property, plant and equipment [abstract]    
Balance Beginning (4,409) (4,825)
Depreciation charge for the year 0 0
Impairment reversal for the year 0  
Impairment charge for the year   0
Disposals 0 329
Foreign exchange rate differences 328 87
Transfers and other movements 0 0
Balance Ending $ (4,081) $ (4,409)
[1] Refer to Note 2 (a) for details on translation of prior period comparatives to United States dollars to conform with changes in presentation currency.