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我矿属前震旦纪海相沉积的变质磷块岩矿床。东山矿段位于锦屏山倒转背斜的东翼。矿体倾角为58～60°,厚度56米左右。矿石稳固性较好,f=6～8,无粘结和自燃现象;据观察,在未受断层及岩溶破坏的地段,当采场暴露面积为1500米~2左右时,其稳定时间可达三个月以上。矿体顶板为云母片岩和大理岩,底板为大理岩,均属中等稳固,f=8～10。矿区地表允许陷落。在长期的生产实践
Mine is a pre-Sinian sea sedimentary metamorphic phosphorite deposit. Dongshan ore section is located in Jinping Shan anticlinal anticline of the eastern wing. Ore body angle of 58 ~ 60 °, the thickness of 56 meters. The stability of the ore is good, f = 6 ~ 8, no bonding and spontaneous combustion phenomenon; It is observed that in the section not ruined by faults and karst, when the stope exposed area of about 1500 m ~ 2, the stability time up More than three months. The top of the ore body is mica schist and marble, and the bottom is marble, all of them are moderately stable, f = 8 ~ 10. Mining surface to allow the fall. In the long-term production practice