Research of the mode of ore extraction under a rock fill (on models)

Abstract

In the practice of the mining industry, there are cases when the release of manganese ore from the chambers has to be carried out under a rock fill, which is lowered after the ore and is continuously added as the ore is released. The need for this may be encountered when the rocks of the hanging wall or the inter-chamber ore pillars are not stable enough. In this case, the stockpile lies directly on top of the ore or a slab is used to separate the ore and the stockpile to prevent the stockpile material from stripping the ore. However, the overlap may not always fulfill this role. For example, if the dip angle is not steep enough and the floor is high, it will drop to the lay side early, and a significant amount of ore will then be released virtually uncovered. The overlap falling on the lying side, together with the stockpile lying on it, may also clamp some of the ore, which will then be lost. This is due to the tendency of the ore pieces, the backfill and the slab itself to move vertically downwards under the influence of gravity.