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Bolting with a Jack leg and rock drill installing split sets and Hog wire. The operator was drilling a new hole in the back. He penetrated the steel about eight inches when the steel snapped on the shank. The remaining piece of drill steel dislodged from the drill hole falling three feet striking ee on his upper left thigh

EE was assisting with removing the drill rods and using a wrench. The drill engaged and cut his finger.