Study of the mode of ore drawing under backfill ( using models)

Abstract

In the practice of the mining industry, there are cases when the release of stored 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 backfill lies directly on top of the ore or a covering is used to separate the ore and the backfill to prevent dilution of the ore by backfill material. However, the covering may not always fulfill this role. For example, if the dip angle is not steep enough and the level height is large, it will drop onto the footwall early, and a significant amount of ore will then be released virtually uncovered. The covering falling on the footwall, together with the backfill 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 covering itself to move vertically downwards under the influence of gravity.

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