A food company is facing hefty fines after federal safety inspectors say its New Jersey plant harbored unsafe working conditions. The Occupational Safety and Health Administration last Wednesday said it proposed fines against Aunt Kitty’s Food Inc. for operating deficiencies at its factory on North Mill Road in Vineland. OSHA proposed the company pay $463,000 in fines, the agency said. The company is a subsidiary of Hanover Foods Inc. It manufactures canned foods including soups, sauces, pasta, vegetables and gravy. Hanover sells products under the the Bickel’s Snacks, Castleberry’s, John Cope…