Hong Kong Regulations

QUARRIES (SAFETY) REGULATIONS - REGULATION 56

Work on faces not to be carried on simultaneously where danger of falling objects

(1) Where any face in a quarry is situated above any other face therein so
that there is a likelihood that, if work on the higher face is carried on, any
person working on the lower face will be endangered by the fall of any
substance or thing from the higher face, no work on the lower face shall be
carried on simultaneously with any work on the higher face.

(2) Any person who-

   (a)  being the supervisor on duty in a quarry, permits any work on any face
        therein to be carried on in contravention of paragraph (1); or

   (b)  works on any face in contravention of paragraph (1), shall be guilty
        of an offence.