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PROPERTY PLANT AND EQUIPMENT - Narrative (Details) - ZAR (R)
R in Millions
12 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2019
Disclosure of detailed information about property, plant and equipment [line items]      
Contracted for but not provided for in the consolidated financial statements R 65.5 R 130.6  
Mine plant facilities and equipment [member] | Bottom of Range [member] | Ergo [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Useful lives 3 years 4 years 3 years
Mine plant facilities and equipment [member] | Bottom of Range [member] | FWGR [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Useful lives 3 years 4 years 5 years
Mine plant facilities and equipment [member] | Top of range [member] | Ergo [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Useful lives   13 years 11 years
Mine plant facilities and equipment [member] | Top of range [member] | FWGR [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Useful lives   20 years 15 years