SALT LAKE CITY (AP) — Regulators say the owner of a Utah coal mine failed to support the ceiling of a tunnel before it collapsed on a machine operator. The U.S. Mine Safety and Health Administration released an investigation Monday into the March collapse that killed 29-year-old Elam Jones in Carbon County. Jones was crushed by a 7-ton slab of falling sandstone at the coal mine about 10 miles west of Huntington. Accident investigators say Kentucky-based Rhino Resource Partners didn't have enough 60-inch bolts drilled into the ceiling to keep it from falling down, and the bolts failed.Read more on NewsOK.com