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Property, plant and equipment - Reconciliation of carrying amount (Details)
$ in Thousands
 6 Months Ended
Jun. 30, 2023
USD ($)
Reconciliation of carrying amount  
Depreciation for the period $ (3,201)
Balance at the end 1,252,903
Freehold land and buildings  
Reconciliation of carrying amount  
Balance at the end 1,112
Plant and equipment  
Reconciliation of carrying amount  
Balance at the end 289,235
ROU asset  
Reconciliation of carrying amount  
Balance at the end 16,000
Mine development  
Reconciliation of carrying amount  
Balance at the end 946,556
Cost  
Reconciliation of carrying amount  
Acquired through business combination 1,254,673
Additions 17,995
Disposals (16,564)
Balance at the end 1,256,104
Cost | Freehold land and buildings  
Reconciliation of carrying amount  
Acquired through business combination 1,128
Balance at the end 1,128
Cost | Plant and equipment  
Reconciliation of carrying amount  
Acquired through business combination 306,381
Additions 564
Disposals (16,564)
Balance at the end 290,381
Cost | ROU asset  
Reconciliation of carrying amount  
Acquired through business combination 398
Additions 15,733
Balance at the end 16,131
Cost | Mine development  
Reconciliation of carrying amount  
Acquired through business combination 946,766
Additions 1,698
Balance at the end 948,464
Accumulated depreciation  
Reconciliation of carrying amount  
Balance at the end 3,201
Accumulated depreciation | Freehold land and buildings  
Reconciliation of carrying amount  
Balance at the end 16
Accumulated depreciation | Plant and equipment  
Reconciliation of carrying amount  
Balance at the end 1,146
Accumulated depreciation | ROU asset  
Reconciliation of carrying amount  
Balance at the end 131
Accumulated depreciation | Mine development  
Reconciliation of carrying amount  
Balance at the end $ 1,908