The employee stated that he was roof bolting the inby corner in # 9-8 crosscut. He was installing his second corner bolt. As he was directing his pinner steel up to the top a rock 11"" x 9"" x 5"" fell striking him on his right hand and wrist. He refused medical treatment at the time of the incident. He had surgery on 3/22/11 to repair a fracture of his little finger.