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梅山铁矿为一大型盲矿体,选用无底柱分段崩落法开采。但在采矿初期,由于矿体顶部的地质边界不清,在第一、二分段回采后,顶部留有3～4米厚的稳固表外矿,因此必须强制崩落处理顶板来形成岩石垫层,以满足挤压爆破、放矿和安全的要求。 (一)地质简况 大型盲矿体呈近水平透镜状产出,沿长轴方向长1200米,宽850米,平均厚度147米,中间最大厚度293米。矿体埋藏深度在-35～-489米之间,第一分段标高为-70米。 矿体顶盘由安山岩和少量次生石英岩组成,厚100～344米,平均222米。近矿围岩
Meishan Iron Ore is a large-scale blind ore body, using bottomless pillar caving method. However, in the early stage of mining, due to the unclear geological boundary at the top of the ore body, after the first and second intervals of mining, there was a stable 3 to 4 meters thick surface off-grade ore on the top, so the roof must be forced to break down to form a rock cushion To meet the requirements of extrusion blasting, ore drawing and safety. (A) Geological Profile Large blind ore body was nearly horizontal lenticular output, along the long axis of 1200 meters long, 850 meters wide, with an average thickness of 147 meters, the middle of the maximum thickness of 293 meters. The burial depth of the orebody is -35 ~ -489 meters, the first sub-elevation is -70 meters. The ore body top plate consists of andesite and a few secondary quartzite, with a thickness of 100-344 meters, an average of 222 meters. Near ore rock