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PROVISION FOR ENVIRONMENTAL REHABILITATION (Details) - ZAR (R)
 12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2016
Disclosure of other provisions [line items]      
Opening balance R 531,700,000 R 522,900,000 R 493,300,000
Unwinding of provision 45,600,000 46,500,000  
Change in estimate of environmental rehabilitation recognised in profit or loss (2,900,000) 600,000  
Change in estimate of environmental rehabilitation cost recognised to decommissioning asset 3,900,000 (34,400,000)  
Environmental rehabilitation payments 24,900,000 19,500,000  
To reduce decommissioning liabilities 21,500,000 11,600,000  
To reduce restoration liabilities 3,400,000 7,900,000  
Transferred from non-current liabilities held for sale` 0 16,800,000  
Closing balance 553,400,000 531,700,000 522,900,000
Environmental rehabilitation payments to reduce the liability 24,900,000 19,500,000  
Ongoing rehabilitation expenditure (26,700,000) (22,400,000)  
Total cash spent on environmental rehabilitation (51,600,000) 41,900,000  
Other environment related provision [member]      
Disclosure of other provisions [line items]      
Opening balance 531,700,000 522,900,000 493,300,000
Unwinding of provision 45,600,000 45,300,000 41,500,000
Change in estimate of environmental rehabilitation recognised in profit or loss (2,900,000) 600,000 21,400,000
Change in estimate of environmental rehabilitation cost recognised to decommissioning asset 3,900,000 (34,400,000) (12,900,000)
Environmental rehabilitation payments 24,900,000 19,500,000 20,400,000
To reduce decommissioning liabilities 21,500,000 11,600,000 10,600,000
To reduce restoration liabilities 3,400,000 7,900,000 9,800,000
Closing balance 553,400,000 531,700,000 522,900,000
Environmental rehabilitation payments to reduce the liability 24,900,000 19,500,000 20,400,000
Ongoing rehabilitation expenditure (26,700,000) (22,400,000) (27,800,000)
Total cash spent on environmental rehabilitation R (51,600,000) R (41,900,000) R (48,200,000)