Employee was filling out pre-op/dust parameter sheet when a rock fell out between the bolts and struck ee on the head, shoulders, and/or back. The miner was not running at the time of the accident. EE received a broken nose, and 3 fractured vertebrae. The Accident Hotline was called on 7-27-17, to report on this accident to abate citation # 9104928, Issued on 7-27-17.