Employee was rib bolting off the miner at approximately 24+40 survey station. Upper portion of the rib became dislodged striking the legs of the employee, as a result they fell hitting their head on the miner. The rock measured 58"" long x 30"" high x 6"" thick. EE suffered a hematoma and concussion like symptoms. No compliance issues were found. No other part 50 criteria apply.