When a slot is cut in middle length hole post and stall method with hard ore,it is often used to cut raise or to cut raise and entry. However cutting raise often uses the method of shallow hole.

• 坚硬矿石内中深孔房柱法切割立槽的开掘,通常使用切割天井拉槽法或切割天井与切割平巷联合拉槽法。