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PROPERTY PLANT AND EQUIPMENT (Details) - ZAR (R)
R in Millions
 12 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2018
Disclosure of detailed information about property, plant and equipment [line items]      
Opening balance R 2,775.3    
Additions - property, plant and equipment owned 182.7 R 353.7 R 126.1
Borrowing cost capitalised 0.0 9.4 0.0
Additions - right-of-use assets 18.0 0.0  
Closing balance 2,621.1 2,775.3  
Gross carrying amount [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Opening balance 4,519.7 3,031.3  
FWGR acquisition   1,225.6  
Additions - property, plant and equipment owned 182.7 353.7  
Borrowing cost capitalised   9.4  
Additions - right-of-use assets 18.0    
Lease modifications 7.5    
Lease derecognitions (26.8)    
Disposals (1.6) (3.3)  
Change in estimate of decommissioning asset (113.6) (97.0)  
Transfers between classes of property, plant and equipment 0.0 0.0  
Closing balance 4,616.8 4,519.7 3,031.3
Gross carrying amount [member] | Impact of adopting IFRS 16 [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Opening balance 30.9    
Closing balance   30.9  
Accumulated depreciation and impairment [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Opening balance (1,744.4) (1,578.6)  
Depreciation (270.8) (169.1)  
Lease derecognitions 17.9    
Disposals 1.6 3.3  
Transfers between classes of property, plant and equipment   0.0  
Closing balance (1,995.7) (1,744.4) (1,578.6)
Mine plant facilities and equipment [Member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Opening balance 1,246.3    
Closing balance 1,186.0 1,246.3  
Mine plant facilities and equipment [Member] | Gross carrying amount [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Opening balance 2,156.2 1,689.5  
FWGR acquisition   198.4  
Additions - property, plant and equipment owned 121.2 284.5  
Borrowing cost capitalised   9.4  
Additions - right-of-use assets 3.8    
Lease modifications 0.0    
Lease derecognitions (26.7)    
Disposals (1.6) (1.6)  
Change in estimate of decommissioning asset (56.7) (24.0)  
Transfers between classes of property, plant and equipment (0.2) 0.0  
Closing balance 2,203.5 2,156.2 1,689.5
Mine plant facilities and equipment [Member] | Gross carrying amount [member] | Impact of adopting IFRS 16 [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Opening balance 7.5    
Closing balance   7.5  
Mine plant facilities and equipment [Member] | Accumulated depreciation and impairment [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Opening balance (909.9) (815.4)  
Depreciation (127.1) (96.1)  
Lease derecognitions 17.9    
Disposals 1.6 1.6  
Transfers between classes of property, plant and equipment   0.0  
Closing balance (1,017.5) (909.9) (815.4)
Mine property and development [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Opening balance 1,282.0    
Closing balance 1,178.5 1,282.0  
Mine property and development [member] | Gross carrying amount [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Opening balance 2,106.8 1,264.5  
FWGR acquisition   849.9  
Additions - property, plant and equipment owned 46.5 66.7  
Borrowing cost capitalised   0.0  
Additions - right-of-use assets 14.2    
Lease modifications 7.5    
Lease derecognitions (0.1)    
Disposals 0.0 (1.7)  
Change in estimate of decommissioning asset (51.5) (75.3)  
Transfers between classes of property, plant and equipment 0.2 2.7  
Closing balance 2,147.0 2,106.8 1,264.5
Mine property and development [member] | Gross carrying amount [member] | Impact of adopting IFRS 16 [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Opening balance 23.4    
Closing balance   23.4  
Mine property and development [member] | Accumulated depreciation and impairment [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Opening balance (824.8) (753.5)  
Depreciation (143.7) (73.0)  
Lease derecognitions 0.0    
Disposals 0.0 1.7  
Transfers between classes of property, plant and equipment   0.0  
Closing balance (968.5) (824.8) (753.5)
Exploration and evaluation assets [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Opening balance 247.0    
Depreciation 0.0    
Closing balance 256.6 247.0  
Exploration and evaluation assets [member] | Gross carrying amount [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Opening balance 256.7 77.3  
FWGR acquisition   177.3  
Additions - property, plant and equipment owned 15.0 2.5  
Borrowing cost capitalised   0.0  
Additions - right-of-use assets 0.0    
Lease derecognitions 0.0    
Disposals 0.0 0.0  
Change in estimate of decommissioning asset (5.4) 2.3  
Transfers between classes of property, plant and equipment 0.0 (2.7)  
Closing balance 266.3 256.7 77.3
Exploration and evaluation assets [member] | Gross carrying amount [member] | Impact of adopting IFRS 16 [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Opening balance 0.0    
Closing balance   0.0  
Exploration and evaluation assets [member] | Accumulated depreciation and impairment [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Opening balance (9.7) (9.7)  
Depreciation 0.0 0.0  
Lease derecognitions 0.0    
Disposals 0.0 0.0  
Transfers between classes of property, plant and equipment   0.0  
Closing balance R (9.7) R (9.7) R (9.7)