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开阳磷矿是我国重要磷矿基地之一。因矿石品位高,储量丰富,矿山规模大而引人注目。磷块岩矿床呈层状产出于上震旦系灯影组白云岩的底部,石英砂岩的上部,形态一般较规整。矿体倾角一般为10～40°,厚度3～7米,顶板围岩稳固,底板围岩较稳固,矿石因节理发育,稳固性稍差。在矿体与顶、底板间,分别夹有断续的含锰白云岩和杂色页岩,均不稳固,但厚度不大,对开采影响较小。自六十年代以来,生产矿井以中、下两个磷矿层(下称中磷和下磷)为开采对象,
Kaiyang phosphate rock is one of China’s major phosphate base. Because of high grade ore, rich reserves, large-scale mining and compelling. Phosphorite deposits are layered in the Upper Sinian Dengying dolomite at the bottom of the upper quartz sandstone, the shape is generally more regular. Ore body inclination is generally 10 ~ 40 °, the thickness of 3 ~ 7 meters, the roof surrounding rock solid, floor rock more stable, due to joint development of ore, the stability of slightly worse. In the ore body and the top, between the floor, respectively, intercept with intermittent manganese-bearing dolomite and variegated shale, are not stable, but the thickness is small, less impact on the mining. Since the 1960s, the production of mines to the middle and lower two phosphate rock layers (hereinafter referred to as phosphorus and phosphorus) for the exploitation of the object,