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OTHER INVESTMENTS- Investments in other entities (Details) - ZAR (R)
R in Millions
12 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2020
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items]      
Investments in other entities R 151.4 R 167.1  
Fair value adjustment on equity instruments at fair value through OCI (15.7) (28.2) R 191.8
Dividends received on equity instruments at fair value through OCI (RMA) (71.5) (76.1) R (4.3)
Listed investments (Fair value hierarchy Level 1) [member]      
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items]      
Investments in other entities 10.7 43.5  
Unlisted investments (Fair value hierarchy Level 3 [member]      
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items]      
Investments in other entities 140.7 123.6  
West Wits Mining Limited ("WWM") [member][Member]      
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items]      
Fair value adjustment on equity instruments at fair value through OCI (32.8) 31.5  
West Wits Mining Limited ("WWM") [member][Member] | Listed investments (Fair value hierarchy Level 1) [member]      
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items]      
Investments in other entities R 10.7 43.5  
Shares held in other entities 47,812,500    
Percentage of interest held 2.40%    
West Wits Mining Limited ("WWM") [member][Member] | Listed investments (Fair value hierarchy Level 1) [member] | Top of range [member]      
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items]      
Percentage of interest held 3.50%    
West Wits Mining Limited ("WWM") [member][Member] | Listed investments (Fair value hierarchy Level 1) [member] | Bottom of Range [member]      
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items]      
Percentage of interest held 2.40%    
Rand Refinery Proprietary Limited ("Rand Refinery") [member]      
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items]      
Fair value adjustment on equity instruments at fair value through OCI R 16.8 (59.1)  
Dividends received on equity instruments at fair value through OCI (RMA) (70.1) (72.3)  
Rand Refinery Proprietary Limited ("Rand Refinery") [member] | Unlisted investments (Fair value hierarchy Level 3 [member]      
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items]      
Investments in other entities R 136.1 119.3  
Shares held in other entities 44,438    
Percentage of interest held 11.30%    
Rand Mutual Assurance Company Limited B Share Business Fund (RMA)      
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items]      
Fair value adjustment on equity instruments at fair value through OCI R 0.3 (0.6)  
Dividends received on equity instruments at fair value through OCI (RMA) (1.4) (3.8)  
Rand Mutual Assurance Company Limited B Share Business Fund (RMA) | Unlisted investments (Fair value hierarchy Level 3 [member]      
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items]      
Investments in other entities R 4.4 4.1  
Shares held in other entities 12,659    
Percentage of interest held 1.30%    
Guardrisk Insurance Company Limited (Cell Captive A170) [member] | Unlisted investments (Fair value hierarchy Level 3 [member]      
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items]      
Percentage of interest held 100.00%    
Guardrisk Insurance Company Limited (Cell Captive A170) [member] | Unlisted investments (Fair value hierarchy Level 3 [member] | Class A Shares [Member]      
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items]      
Investments in other entities R 0.1 0.1  
Shares held in other entities 20    
Chamber of Mines Building Company Proprietary Limited [member] | Unlisted investments (Fair value hierarchy Level 3 [member]      
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items]      
Investments in other entities R 0.1 R 0.1  
Shares held in other entities 42,292    
Percentage of interest held 4.50%