At least seven illegal miners are now believed to have been shot dead at a disused mine at Benoni on the East Rand.
Police spokesperson Lungelo Dlamini says they have found two more bodies close to the illegal mine.
Dlamini says the body of an eighth illegal miner is believed to be trapped underground.
He says the bodies have not yet been identified and the motive for the killing remains unknown.
Dlamini says police suspect that the killers may be rival miners.
Police are investigating a murder case.
No arrests had been made.