山东省宁阳县东谷堆贫铁矿床地质特征

宁阳县东谷堆铁矿化属晚期岩浆液态分异的熔离矿化,铁矿化体赋存于麻塔单元粗粒变角闪石岩内,矿床由3个矿化体组成,各矿化体相间分布,总体走向均为NW向。矿石自然类型有磁铁阳起角闪石岩、磁铁黑云角闪石岩。矿石矿物以磁铁矿为主,脉石矿物主要为角闪石。矿石具柱粒状变晶结构、鳞片变晶结构、包含结构,浸染状构造、块状构造。矿石品位低,全铁含量一般13.5%~16.5%,最高达19.76%。矿床平均品位TFe15.15%,SFe8.26%。矿化体裸露地表,适宜露天开采。矿石加工技术性能良好,采用二次精选,一次扫选半闭路式选矿工艺流程。选石结果为:精矿全铁含量62.10%,精矿率11%~12%,回收率31.40%。

Geological Characteristics of Donggudui Lean Iron Deposit in Ningyang County of Shandong Province

Donggudui iron deposit in Ningyang county belongs to melting mineralization in late period of magma differentiation. Iron mineralization occurs in coarse epihornblendite. Deposit is composed of 3 metallization ores and distributes in cross with the trend of EW. Natural types of ores are magnetic actinolite hornblendite, magnetic biotite hornblendite. magnetite is major ore mineral, while hornblendite is major vein mineral. Ores have columnar crystalloblastic fabric, lepidoblastic texture, inclusion texture, impregnation structure and block texture. Ore degree is low, average iron content is 13.5%~16.5%, and the highest content is 19.76%. Average degree of deposit is TFe 15.15%, SFe is 8.26%. Ore metallization bared in surface which is suitable for mining. Ore processing technology is good. The ore processing result of TFe is 62.10%, finished ore ratio is 11%~12%, and recovery ratio is 31.40%.