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RIGHT OF USE ASSETS AND LEASES - Right-of-use assets (Details) - ZAR (R)
R in Millions
 12 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Disclosure of quantitative information about right-of-use assets [line items]    
Opening balance R 47.7  
Additions 6.1 R 15.9
Lease modifications (0.6) 1.2
Lease derecognitions (1.2) 0.0
Closing balance 34.8 47.7
Cost    
Disclosure of quantitative information about right-of-use assets [line items]    
Opening balance 89.6 74.1
Additions 6.1 15.9
Lease modifications (0.6) 1.2
Lease derecognitions (5.0) (1.6)
Closing balance 90.1 89.6
Accumulated depreciation and impairment    
Disclosure of quantitative information about right-of-use assets [line items]    
Opening balance (41.9) (25.0)
Depreciation (17.4) (18.5)
Lease derecognitions 4.0 1.6
Closing balance (55.3) (41.9)
Mine plant facilities and equipment    
Disclosure of quantitative information about right-of-use assets [line items]    
Opening balance 18.2  
Closing balance 9.7 18.2
Mine plant facilities and equipment | Cost    
Disclosure of quantitative information about right-of-use assets [line items]    
Opening balance 31.2 26.8
Additions 0.0 6.0
Lease modifications (0.6) 0.0
Lease derecognitions (4.2) (1.6)
Closing balance 26.4 31.2
Mine plant facilities and equipment | Accumulated depreciation and impairment    
Disclosure of quantitative information about right-of-use assets [line items]    
Opening balance (13.0) (6.2)
Depreciation (7.7) (8.4)
Lease derecognitions 4.0 1.6
Closing balance (16.7) (13.0)
Mine property and development    
Disclosure of quantitative information about right-of-use assets [line items]    
Opening balance 29.5  
Closing balance 25.1 29.5
Mine property and development | Cost    
Disclosure of quantitative information about right-of-use assets [line items]    
Opening balance 58.4 47.3
Additions 6.1 9.9
Lease modifications 0.0 1.2
Lease derecognitions (0.8) 0.0
Closing balance 63.7 58.4
Mine property and development | Accumulated depreciation and impairment    
Disclosure of quantitative information about right-of-use assets [line items]    
Opening balance (28.9) (18.8)
Depreciation (9.7) (10.1)
Lease derecognitions 0.0 0.0
Closing balance R (38.6) R (28.9)