While mining operations were being done in #8 entry of the 001 section, a piece of rock fell out between the rib and the first row of bolts. The rock hit the employee on the left side of his back and down to his left hip, causing him to fall forward. The rock measured 68"" long, 16"" on one end and 30"" wide on the other end, 2"" to 8"" thick.