INJURED WAS HELPING SURVEY THE AMERICAN & NICKLE PLATE COAL SEAMS. HE WALKED UP THE RAMP TO THE NICKLE PLATE SEAM, TOOK ONE SPOT & MOVED UP THE PIT TO LOCATE THE NEXT SPOT. HE WAS HOLDING THE SURVEY ROD WHILE THE OTHER ENGINER POSITIONED THE CROSS HAIRS ON THE SURVEY INSTRUMENT. EE FELL BACKWARDS STRIKING THE BACK OF HIS HEAD.