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PROPERTY PLANT AND EQUIPMENT - Narrative (Details)
R in Millions
 12 Months Ended
Jun. 30, 2018
ZAR (R)
R / kg
Jun. 30, 2017
ZAR (R)
Jun. 30, 2016
Impairment of property, plant and equipment [abstract]      
Gold price | R / kg 550,411    
Percentage of escalation of recoverable amount 5.80%    
Weighted average cost of capital 11.20%    
Percentage decrease in gold production 4.10%    
Depreciation of mine plant facilities and equipment [abstract]      
Ergo leases temporary power generation equipment R 1,452.7 R 1,497.6  
Effective interest rate 17.90%    
Option to acquire lease equipment at the end of the term R 9.9    
Bottom of Range [member]      
Impairment of property, plant and equipment [abstract]      
Change in discount rate 11.20%    
Top of range [member]      
Impairment of property, plant and equipment [abstract]      
Change in discount rate 21.40%    
Ergo leases temporary power generation equipment [Member]      
Depreciation of mine plant facilities and equipment [abstract]      
Ergo leases temporary power generation equipment R 13.6 16.8  
Finance lease with an outstanding balance 14.0 16.8  
Option to acquire lease equipment at the end of the term 9.9    
Ergo leases temporary power generation equipment [Member] | 2019 [member]      
Depreciation of mine plant facilities and equipment [abstract]      
The finance lease installments 3.2    
Interest payable installments 2.0    
Ergo leases temporary power generation equipment [Member] | 2020 [member]      
Depreciation of mine plant facilities and equipment [abstract]      
The finance lease installments 10.8    
Interest payable installments 0.4    
Mine property and development Member [Member]      
Depreciation of mine plant facilities and equipment [abstract]      
Ergo leases temporary power generation equipment R 511.0 R 523.1  
Mine property and development Member [Member] | Bottom of Range [member]      
Depreciation of mine plant facilities and equipment [abstract]      
Useful lives 4 years 2 years 6 years
Mine property and development Member [Member] | Top of range [member]      
Depreciation of mine plant facilities and equipment [abstract]      
Useful lives 12 12 years 10 years