The South San Joaquin County Fire Authority responded last Saturday to the report of a person who had fallen into a large silo at the Holly Sugar plant in Tracy, about 100km south of Sacramento.
When firefighters arrived, they found a worker had fallen about 25 metres into machinery near the bottom of the silo.
The worker died after the incident.
A firefighter was lowered into the silo after crews set up a rescue rope system to retrieve the body.
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It took 16 firefighters about an hour to complete the operation.
South County Fire Chief Randall Bradley said: “This was an extremely challenging operation that our crews handled safely with the required precision needed for this type of incident.”
According to the San Joaquin County Coroner’s Office, the worker has been identified as 53-year-old Elk Grove resident Dean Melavic.
The cause of the accident is under investigation.