Underground work in mines and quarries or in industrial undertakings involving tunnelling operations , and carrying loads unreasonably heavy for the young person s age and physical development are prohibited 禁止青年在?场或石矿场从事地底工作，或在工业经营内担任涉及开掘隧道的工作，以及搬动对他们的年龄和体格来说，属过重的物品。
Concrete production only , provided that any aggregates imported from the mainland for use in the premises , the locations at which the aggregates are supplied and landed in hong kong and the route by which the aggregates are transported to the premises shall be subject to the prior written approval of the chief geotechnical engineer , mines and quarries of the civil engineering department 只限作混凝土生产，但必须就任何从内地进口以供在上述土地范围内使用的碎石、碎石的供应地及本港的卸货地点，以及碎石运送至上述土地的路线，事先获得土木工程署总土力工程师( ?务及石矿)的书面批准
