The accident happened at a factory in Bon Accord.
A construction worker lost a part of his leg in Pretoria North, Gauteng paramedics said on Saturday.
The man, believed to be in his thirties, had been cleaning a cement mixer when it turned on, said Netcare 911 spokesperson Shawn Herbst.
The accident happened at a factory in Bon Accord on Friday afternoon.
He was rushed to hospital in a helicopter.
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