EE went to move the 4 man diesel, pulled it up about 8-10 ft. to get it out of the way. EE said that a piece of rock fell and hit them in the head and left shoulder. This happened between 2:30 and 3:30am and they continued to work until around 4:oo when they were transported outside. Also MSHA was called,because the ambulance EMT called life-flight. EE was sent to St. Vincent.