v3.26.1
Directors' and prescribed officers' remuneration - Key management share ownership (Details) - shares
Apr. 24, 2026
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Disclosure of transactions between related parties [line items]        
Number of shares (in shares)   6,063,927 6,470,779 7,829,966
Ownership interest   0.21% 0.23% 0.28%
Directors        
Disclosure of transactions between related parties [line items]        
Number of shares (in shares)   4,805,486 4,750,897 6,220,640
Ownership interest   0.17% 0.14% 0.22%
Neal Froneman        
Disclosure of transactions between related parties [line items]        
Number of shares (in shares)   1,829,452 1,829,452 3,284,428
Ownership interest   0.06% 0.06% 0.12%
ADR shares held (in shares)   388,863 388,863 388,863
Ordinary shares issued upon conversion of ADRs (in shares)   1,555,452 1,555,452 1,555,452
Richard Stewart        
Disclosure of transactions between related parties [line items]        
Number of shares (in shares)   788,771 788,771 788,771
Ownership interest   0.03% 0.03% 0.03%
Charl Keyter        
Disclosure of transactions between related parties [line items]        
Number of shares (in shares)   1,826,481 1,776,481 1,776,481
Ownership interest   0.06% 0.06% 0.06%
Charl Keyter | Major ordinary share transactions        
Disclosure of transactions between related parties [line items]        
Number of shares (in shares) 2,010,300      
Timothy Cumming        
Disclosure of transactions between related parties [line items]        
Number of shares (in shares)   20,000 20,000 20,000
Ownership interest   0.00% 0.00% 0.00%
Richard Menell        
Disclosure of transactions between related parties [line items]        
Number of shares (in shares)   10,125 10,125 10,125
Ownership interest   0.00% 0.00% 0.00%
Richard Menell | Major ordinary share transactions        
Disclosure of transactions between related parties [line items]        
Number of shares (in shares) 20,125      
Keith Rayner        
Disclosure of transactions between related parties [line items]        
Number of shares (in shares)   78,992 78,992 73,992
Ownership interest   0.00% 0.00% 0.00%
Susan van der Merwe        
Disclosure of transactions between related parties [line items]        
Number of shares (in shares)   0 0 1,028
Ownership interest   0.00% 0.00% 0.00%
Jeremiah Vilakazi        
Disclosure of transactions between related parties [line items]        
Number of shares (in shares)   2,000 2,000 4,220
Ownership interest   0.00% 0.00% 0.00%
Vincent Maphai        
Disclosure of transactions between related parties [line items]        
Number of shares (in shares)   232,813 228,224 228,224
Ownership interest   0.01% 0.01% 0.01%
Savannah Danson        
Disclosure of transactions between related parties [line items]        
Number of shares (in shares)   0 0 16,519
Ownership interest   0.00% 0.00% 0.00%
Harry Kenyon-Slaney        
Disclosure of transactions between related parties [line items]        
Number of shares (in shares)   16,852 16,852 16,852
Ownership interest   0.00% 0.00% 0.00%
ADR shares held (in shares)   4,213 4,213 4,213
Dawie Mostert        
Disclosure of transactions between related parties [line items]        
Number of shares (in shares)   0 0 136,302
Ownership interest   0.00% 0.00% 0.00%
Themba Nkosi        
Disclosure of transactions between related parties [line items]        
Number of shares (in shares)   251,583 251,583 251,583
Ownership interest   0.01% 0.01% 0.01%
ADR shares held (in shares)   5,300 5,300 5,300
Ordinary shares issued upon conversion of ADRs (in shares)   21,200 21,200 21,200
Robert van Niekerk        
Disclosure of transactions between related parties [line items]        
Number of shares (in shares)   180,000 490,429 490,429
Ownership interest   0.01% 0.02% 0.02%
Laurent Charbonnier        
Disclosure of transactions between related parties [line items]        
Number of shares (in shares)   0 151,012 151,012
Ownership interest   0.00% 0.01% 0.01%
ADR shares held (in shares)     37,753 37,753
Charles Carter        
Disclosure of transactions between related parties [line items]        
Number of shares (in shares)   680,000 680,000 580,000
Ownership interest   0.02% 0.02% 0.02%
ADR shares held (in shares)   170,000 170,000 145,000
Charles Carter | Major ordinary share transactions        
Disclosure of transactions between related parties [line items]        
Number of shares (in shares) 720,000      
Melanie Naidoo-Vermaak        
Disclosure of transactions between related parties [line items]        
Number of shares (in shares)   146,858 146,858 0
Ownership interest   0.01% 0.01% 0.00%