Mississippi Lime Co. president Bill Ayers issued a statement saying 53-year-old John Hahl, of Farmington, Mo., and 29-year-old Chris Rawson, of Hillsboro, Mo., died in the accident around 8:30 a.m. Friday.
Hahl and Rawson were working in a lime mine near the town of Ste. Genevieve, about 60 miles south of St. Louis.
Ste. Genevieve County Coroner Leo Basler says the men were in a basket extended from a truck removing loose rock from either the wall or the ceiling of the mine.
Basler says loose rock hit the basket and detached it. The men fell to their death.
St. Louis-based Mississippi Lime Co. makes calcium products and calcium-based solutions.