Common blasting time for adjacent mines

(1) Where work is conducted at adjacent surface or underground mines having connected workings, the managers shall agree to a mutually acceptable common blasting time and Examination breakthrough. (2) When an active underground working is within 8 meters (26.5 feet) of another mine opening or a drill hole, the shift supervisor shall make a thorough examination of the other opening or the drill hole collar and ensure that the workplace can be advanced in a safe manner and also ensure that access to the nearest point of intersection with the other opening or the drill hole collar is guarded during blasting.