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A police spokeswoman said police were called to the property on Old Brighton Rd just after 4pm today.
A St John spokeswoman said the man was taken to Dunedin Hospital by St John ambulance in a critical condition.
The man was run over by a tractor or a ride-on lawnmower, the police spokeswoman said.
A reporter at the scene said it appeared it was a ride-on lawnmower.
Two police cars were at the property and an ambulance left with its lights on at 4.45pm.