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Accounting policies - Summary of Key assumptions used in the Income and Market Approach (Detail) - $ / oz
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Disclosure of Detailed Information of Key Assumptions Used in the Income and Market Approach Explanatory [line items]    
Discount rates – real 19.90% 19.30%
Life-of-mine 7 years 6 years
Year 1 - 3 | Bottom of range    
Disclosure of Detailed Information of Key Assumptions Used in the Income and Market Approach Explanatory [line items]    
Gold price per ounce/kg 1,800 1,650
Year 1 - 3 | Top of range    
Disclosure of Detailed Information of Key Assumptions Used in the Income and Market Approach Explanatory [line items]    
Gold price per ounce/kg 1,910 1,740
Year four onwards    
Disclosure of Detailed Information of Key Assumptions Used in the Income and Market Approach Explanatory [line items]    
Gold price per ounce/kg 1,720 1,620