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OTHER INVESTMENTS- Investments in other entities (Details) - ZAR (R)
R in Millions
 12 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2019
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items]      
Investments in other entities R 167.1 R 195.3  
Dividends received on equity instruments at fair value through OCI (RMA) (76.1) (4.3) R 0.0
Fair value adjustment on equity instruments at fair value through OCI (28.2) 191.8 R (5.9)
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 43.5 12.0  
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 123.6 183.3  
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 43.5 R 12.0  
Shares held in other entities 47,812,500    
Percentage of interest held 3.50% 5.10%  
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]      
Dividends received on equity instruments at fair value through OCI (RMA) R (72.3) R 0.0  
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 119.3 178.4  
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]      
Dividends received on equity instruments at fair value through OCI (RMA) R (3.8) (4.3)  
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 4.1 4.7  
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%