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宜昌磷矿为一浅海相沉积磷块岩矿床,矿层产于上震旦系陡山沦组,自上而下共有三个含磷层位,分别称为上、中、下磷层。其中上磷层(Ph_3)层位稳定,但由于品位低、厚度小,无工业价值;中磷层(Ph_2)为白云岩条带磷块岩,地质品位13％左右(在一期工程丁家河矿段的工业储量约占全矿段5～7％),需经选矿提供精矿产品;下磷层(Ph_1)产于白云岩(Zbd_1~3)底部,是本区主要工业磷矿层。
Yichang Phosphorite is a shallow marine sedimentary phosphorite deposit hosted by the Upper Sinian steep-mountain group. There are three phosphorus-bearing layers from top to bottom, which are called upper, middle and lower phosphorous layers, respectively. Among them, Ph_3 layer is stable, but it has no industrial value due to its low grade and small thickness. Phosphorus layer is Phosphorite dolomite with a geological grade of about 13% (in the first phase of Dingjiahe Mine The industrial reserves of the section account for about 5% to 7% of the whole ore section, and concentrate ore products are to be provided through ore dressing. The lower phosphorus layer (Ph_1) is produced at the bottom of the dolomite (Zbd_1 ~ 3) and is the main industrial phosphate rock layer in this area.