The method was designed to limit some of the problemsinherent with the open ended lifting. It reduces the lenght of each lift so the a continuous miner and its crew are exposed to a lesser span of cantilevered roof. It is not so amenable to ad hoc changes to the […]

In this method a succession of drives is made down the goaf side or sides of the pillar (picture). Roof support for the drives is by rows of breaking-off propos placed along the goaf sideand with or without cross timber to support the immediate roof of the place. The method […]