EMPLOYEE WAS ASSISTING WITH THE SET UP OF A CRANE FOR DRAGLINE. WHILE STANDING ON THE TRACK HELPING TO GUIDE THE MAIN HOIST INTO POSITION IN ORDER TO PUT GANTRY IN PLACE, CABLES THAT WERE ATTACHED TO THE GANTRY WERE PULLED CAUSING THE GANTRY TO TIP & FALL. PART OF THE GANTRY HIT HIS LEG RESULTING IN A GROSS CONTUSION & SPRAINED RT. FOOT.