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Financial Risk Management - Schedule of Liquidity Risk (Details)
Dec. 31, 2024
USD ($)
Gold Notes  
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items]  
Total $ 43,840
Liquidity Risk  
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items]  
Trade, tax and other payables 94,517,000
Reclamation and closure costs 29,189,000
Lease payments 5,785,000
Total 860,376,000
Liquidity Risk | Gold Notes  
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items]  
Gold notes, senior unsecured notes 93,681,000
Liquidity Risk | Senior Notes  
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items]  
Gold notes, senior unsecured notes 630,000,000
Liquidity Risk | Other Contractual Commitments  
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items]  
Gold notes, senior unsecured notes 7,204,000
Less than 1 year | Gold Notes  
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items]  
Total 16,132
Less than 1 year | Liquidity Risk  
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items]  
Trade, tax and other payables 94,517,000
Reclamation and closure costs 2,346,000
Lease payments 1,857,000
Total 176,111,000
Less than 1 year | Liquidity Risk | Gold Notes  
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items]  
Gold notes, senior unsecured notes 34,187,000
Less than 1 year | Liquidity Risk | Senior Notes  
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items]  
Gold notes, senior unsecured notes 36,000,000
Less than 1 year | Liquidity Risk | Other Contractual Commitments  
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items]  
Gold notes, senior unsecured notes 7,204,000
1 to 3 years | Liquidity Risk  
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items]  
Trade, tax and other payables 0
Reclamation and closure costs 1,329,000
Lease payments 1,374,000
Total 170,197,000
1 to 3 years | Liquidity Risk | Gold Notes  
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items]  
Gold notes, senior unsecured notes 59,494,000
1 to 3 years | Liquidity Risk | Senior Notes  
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items]  
Gold notes, senior unsecured notes 108,000,000
1 to 3 years | Liquidity Risk | Other Contractual Commitments  
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items]  
Gold notes, senior unsecured notes 0
4 to 5 years | Liquidity Risk  
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items]  
Trade, tax and other payables 0
Reclamation and closure costs 7,086,000
Lease payments 887,000
Total 493,973,000
4 to 5 years | Liquidity Risk | Gold Notes  
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items]  
Gold notes, senior unsecured notes 0
4 to 5 years | Liquidity Risk | Senior Notes  
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items]  
Gold notes, senior unsecured notes 486,000,000
4 to 5 years | Liquidity Risk | Other Contractual Commitments  
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items]  
Gold notes, senior unsecured notes 0
Over 5 years | Liquidity Risk  
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items]  
Trade, tax and other payables 0
Reclamation and closure costs 18,428,000
Lease payments 1,667,000
Total 20,095,000
Over 5 years | Liquidity Risk | Gold Notes  
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items]  
Gold notes, senior unsecured notes 0
Over 5 years | Liquidity Risk | Senior Notes  
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items]  
Gold notes, senior unsecured notes 0
Over 5 years | Liquidity Risk | Other Contractual Commitments  
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items]  
Gold notes, senior unsecured notes $ 0