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一、地质概况 矿区主要出露地层有:前震旦系冷家溪群浅变质的绿色千枚状板岩,千枚岩;震旦系下统浅灰色变质砂岩夹薄层粉砂岩,石炭系中上统壶天灰岩群为灰白色白云质灰岩和白云岩。第四系为灰褐色粘土及铁锰粘土。金银矿主要赋存在铁锰粘土层中。 构造:矿区位于浏醴“S”型构造带的北东端之北侧,次一级构造属永和～横山向斜东部封闭端断裂构造复杂,在空间分布上有东西、北西,北西西向三组压扭性断裂,北东向张扭性断裂,岩体侵入中心处于矿区中部构造复合部位(图1)。 岩浆岩:本区浅成相的
I. Geological Overview The major exposed formations in the mine area are: Pre-Sinian Lengjixi Group metamorphic green-like monolithic slate and phyllite; Sinian-hosted light-gray metamorphic sandstone and thin-bedded siltstone, Carboniferous The Upper Jurati limestone group is a pale dolomitic limestone and dolomite. Quaternary gray-brown clay and iron manganese clay. Gold and silver deposits mainly exist in the iron-manganese clay layer. Structure: The mining area is located on the north side of the north east end of the “S” tectonic belt. The secondary structure belongs to the Yonghe-Yokoyama syncline. The eastern closed end is characterized by complicated structures and three spatial distributions of east-west, northwest and northwest-west The compressive-to-torsional fracture and the NE-trending tensional fracture, and the intrusion center of the rock mass are located in the complex structure in the middle of the mining area (Fig. 1). Magmatic rocks: This area is pale facies