PROPERTY, PLANT AND EQUIPMENT - Narrative (Details) - ZAR (R) R in Millions	12 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2024
Disclosure of reconciliation of changes in property, plant and equipment, including right-of-use assets [line items]
Contractual commitments for acquisition of property, plant and equipment	R 1,807.0	R 2,308.2
Mine plant facilities and equipment \| Bottom of range \| Ergo
Disclosure of reconciliation of changes in property, plant and equipment, including right-of-use assets [line items]
Useful lives	1 year	1 year	1 year
Mine plant facilities and equipment \| Bottom of range \| FWGR
Disclosure of reconciliation of changes in property, plant and equipment, including right-of-use assets [line items]
Useful lives	1 year	1 year
Mine plant facilities and equipment \| Top of range \| Ergo
Disclosure of reconciliation of changes in property, plant and equipment, including right-of-use assets [line items]
Useful lives	21 years	22 years	18 years
Mine plant facilities and equipment \| Top of range \| FWGR
Disclosure of reconciliation of changes in property, plant and equipment, including right-of-use assets [line items]
Useful lives	20 years	16 years	17 years
Solar power plant and BESS \| 60MW solar photovoltaic plant
Disclosure of reconciliation of changes in property, plant and equipment, including right-of-use assets [line items]
Useful lives	25 years
Solar power plant and BESS \| 160mWh battery energy storage system
Disclosure of reconciliation of changes in property, plant and equipment, including right-of-use assets [line items]
Useful lives	20 years