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RESULTS FROM OPERATING ACTIVITIES (Details) - ZAR (R)
 12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2016
Disclosure Of Operating Activities [Abstract]      
Cost of sales R 2,347,700,000 R 2,307,900,000 R 2,236,800,000
Operating costs (2,207,100,000) (2,109,300,000) (2,030,200,000)
Depreciation (168,000,000) (179,800,000) (180,200,000)
Retrenchment costs 0 23,000,000 0
Movement in provision for environmental rehabilitation 2,900,000 (600,000) (19,300,000)
Decrease (increase) in inventories of finished goods and work in progress (24,500,000) (4,800,000) 7,100,000
Operating cost [abstract]      
Materials (784,600,000) (783,900,000) (719,500,000)
Labour including short term incentives, excluding retrenchment costs (417,400,000) (351,000,000) (362,100,000)
Electricity (369,000,000) (344,200,000) (325,400,000)
Specialist service providers (326,900,000) (299,700,000) (282,400,000)
Water R (49,900,000) R (71,100,000) R (82,100,000)