The Ministry of Labour, Immigration, Training and Skills Development is investigating after an employee at a local business suffered serious injuries on Tuesday morning.
Emergency services responded to an incident along Bruce Road 3 just outside of Mildmay.
It was reported a worker, employed by J T Excavating, was injured by a piece of machinery.
The 23-year-old resident of West Grey was transported by Air Ornge to a trauma centre in London with serious injuries.
A Ministry inspector has been assigned and the investigation remains ongoing.