Applicable conditions for sublevel caving of the bottom column :
(1) The surface is allowed to collapse. Precautionary measures must be taken if surface soils are likely to form large amounts of mud into the well with water falling from the rock formation .
(2) Applicable ore body thickness and ore body angle. The thickness of the steeply inclined ore body is not less than 5m, and the thickness of the inclined ore body is not less than 10m; when the thickness of the ore body is large, the inclination angle is not limited when it exceeds 20m. The best condition is a steeply inclined ore body with a thickness of 15-20 m or more.
(3) The stability of the surrounding rock is not limited. When the rock is not stable, the sublevel caving method is more suitable than other mining methods. Since the mining engineering is often arranged in the rock of the lower plate, the stability of the following rock is not lower than the medium stability.
(4) The stability of the ore should be allowed to be arranged and cut in the ore body. After the proper support, the ore roadway should be able to maintain the mine without damage during the mining, so the ore stability should not be lower than the medium stability.
(5) It is not under special favorable conditions (inclination angle is greater than 75°-78°, thickness is greater than 15-20m, and the ore body shape is relatively regular). The ore loss of this method is relatively depleted, so it is only suitable for mining ore bodies with low value of ore.
(6) Since the method cannot be separated, it is better to have no thick rock interlayer in the ore body. Under the condition that the ore body has a large dip angle and the section height is recovered, the ore must have no self-ignitability and cohesiveness.
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