Worksafe New Zealand is prosecuting Affco after an employee was impaled in the head by a meat hook and dragged at its Rangiuru meat processing plant.
In August last year Jason Matahiki was part of a two-man night-shift team cleaning spreader hooks - which hold cow carcasses' legs apart on a chain conveyor - when a hook hit him from behind.
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The 10cm hook impaled Mr Matahiki behind his ear and came out by his eye.
It became lodged between cheek muscle and skull bone.