v3.26.1
Financial risk management - Liquidity risk (Details)
Dec. 31, 2025
USD ($)
Dec. 31, 2024
USD ($)
Dec. 31, 2024
ZAR (R)
ABSA Financing [member]      
Net undiscounted cash flows      
ifrs Line of credit facility, maximum borrowing capacity   $ 21,200,000 R 350,000,000
Liquidity risk      
Net undiscounted cash flows      
Long term power purchase commitments $ 547,114,000 293,709,000  
Non-derivative financial liabilities, undiscounted cash flows 522,019,000 477,479,000  
Liquidity risk | ABSA Financing [member]      
Net undiscounted cash flows      
ifrs Line of credit facility, maximum borrowing capacity   18,500,000 R 350,000,000
Liquidity risk | Bank borrowings      
Net undiscounted cash flows      
Non-derivative financial liabilities, undiscounted cash flows 146,409,000 57,162,000  
Liquidity risk | Leases      
Net undiscounted cash flows      
Non-derivative financial liabilities, undiscounted cash flows 154,146,000 169,809,000  
Liquidity risk | Debt instruments      
Net undiscounted cash flows      
Non-derivative financial liabilities, undiscounted cash flows 26,014,000 10,268,000  
Liquidity risk | Financial loans from government agencies      
Net undiscounted cash flows      
Non-derivative financial liabilities, undiscounted cash flows 35,644,000 69,651,000  
Liquidity risk | Payables to related parties.      
Net undiscounted cash flows      
Non-derivative financial liabilities, undiscounted cash flows 2,577,000 2,664,000  
Liquidity risk | Payable to non-current asset suppliers      
Net undiscounted cash flows      
Non-derivative financial liabilities, undiscounted cash flows 9,115,000 7,209,000  
Liquidity risk | contingent consideration      
Net undiscounted cash flows      
Non-derivative financial liabilities, undiscounted cash flows 3,261,000 3,652,000  
Liquidity risk | Trade and other payables.      
Net undiscounted cash flows      
Non-derivative financial liabilities, undiscounted cash flows 144,853,000 157,064,000  
Not later than one year | Liquidity risk      
Net undiscounted cash flows      
Non-derivative financial liabilities, undiscounted cash flows 294,270,000 283,984,000  
Not later than one year | Liquidity risk | Bank borrowings      
Net undiscounted cash flows      
Non-derivative financial liabilities, undiscounted cash flows 81,402,000 43,251,000  
Not later than one year | Liquidity risk | Leases      
Net undiscounted cash flows      
Non-derivative financial liabilities, undiscounted cash flows 14,723,000 14,225,000  
Not later than one year | Liquidity risk | Debt instruments      
Net undiscounted cash flows      
Non-derivative financial liabilities, undiscounted cash flows 26,014,000 10,268,000  
Not later than one year | Liquidity risk | Financial loans from government agencies      
Net undiscounted cash flows      
Non-derivative financial liabilities, undiscounted cash flows 12,447,000 47,283,000  
Not later than one year | Liquidity risk | Payables to related parties.      
Net undiscounted cash flows      
Non-derivative financial liabilities, undiscounted cash flows 2,577,000 2,664,000  
Not later than one year | Liquidity risk | Payable to non-current asset suppliers      
Net undiscounted cash flows      
Non-derivative financial liabilities, undiscounted cash flows 8,993,000 7,066,000  
Not later than one year | Liquidity risk | contingent consideration      
Net undiscounted cash flows      
Non-derivative financial liabilities, undiscounted cash flows 3,261,000 2,163,000  
Not later than one year | Liquidity risk | Trade and other payables.      
Net undiscounted cash flows      
Non-derivative financial liabilities, undiscounted cash flows 144,853,000 157,064,000  
Later than one year and not later than two years | Liquidity risk      
Net undiscounted cash flows      
Non-derivative financial liabilities, undiscounted cash flows 45,688,000 26,225,000  
Later than one year and not later than two years | Liquidity risk | Bank borrowings      
Net undiscounted cash flows      
Non-derivative financial liabilities, undiscounted cash flows 20,283,000 681,000  
Later than one year and not later than two years | Liquidity risk | Leases      
Net undiscounted cash flows      
Non-derivative financial liabilities, undiscounted cash flows 12,734,000 14,504,000  
Later than one year and not later than two years | Liquidity risk | Financial loans from government agencies      
Net undiscounted cash flows      
Non-derivative financial liabilities, undiscounted cash flows 12,549,000 9,408,000  
Later than one year and not later than two years | Liquidity risk | Payable to non-current asset suppliers      
Net undiscounted cash flows      
Non-derivative financial liabilities, undiscounted cash flows 122,000 143,000  
Later than one year and not later than two years | Liquidity risk | contingent consideration      
Net undiscounted cash flows      
Non-derivative financial liabilities, undiscounted cash flows   1,489,000  
Later than two years and not later than five years [member] | Liquidity risk      
Net undiscounted cash flows      
Non-derivative financial liabilities, undiscounted cash flows 51,822,000 52,345,000  
Later than two years and not later than five years [member] | Liquidity risk | Bank borrowings      
Net undiscounted cash flows      
Non-derivative financial liabilities, undiscounted cash flows 16,781,000 13,230,000  
Later than two years and not later than five years [member] | Liquidity risk | Leases      
Net undiscounted cash flows      
Non-derivative financial liabilities, undiscounted cash flows 24,393,000 26,155,000  
Later than two years and not later than five years [member] | Liquidity risk | Financial loans from government agencies      
Net undiscounted cash flows      
Non-derivative financial liabilities, undiscounted cash flows 10,648,000 12,960,000  
Later than five years | Liquidity risk      
Net undiscounted cash flows      
Non-derivative financial liabilities, undiscounted cash flows 130,239,000 114,925,000  
Later than five years | Liquidity risk | Bank borrowings      
Net undiscounted cash flows      
Non-derivative financial liabilities, undiscounted cash flows 27,943,000    
Later than five years | Liquidity risk | Leases      
Net undiscounted cash flows      
Non-derivative financial liabilities, undiscounted cash flows $ 102,296,000 $ 114,925,000