安徽省铜陵马山金硫矿床北段金矿物特征研究

Study on the Characteristics of Gold Minerals in the Northern Segment of the Mashan Goldsulfur Deposit in Tongling,Anhui Province

安徽省铜陵马山金硫矿床北段位于铜陵铜官山矿田内,是一大型高砷硫金矿床。矿床中Au以独立金矿物及超显微金形式赋存,通过金的配分计算,Au在各矿物中的绝对配分比总计50.56%,以包体金或超显微金形式赋存于黄铁矿、磁黄铁矿、毒砂中。单体解离金矿物经反推为49.44%,以晶隙金、裂隙金的形式赋存。独立金矿物以银金矿为主,少量自然金、金银矿,金矿物成色范围在420.09‰~887.29‰,平均701.33‰,金矿物成色偏低。金矿物的赋存形态多样,主要以长角粒状、圆粒状为主,次为枝丫状、针状。矿石中金矿物按颗粒数统计,以微、细粒金含量为主;按面积统计,则以粗粒金为主。

The northern section of the Mashan gold-sulfur deposit in Tongling in Anhui province,is located in the Tongguanshan ore field of Tongling,and is a large-scale high-arsenic sulfur-gold deposit.In the deposit,Au is present in the forni of independent gold minerals and ultra-microscopic gold.Through the calculation of gold distribution,the absolute ratio of Au in each mineral is 50.56%,which indicates that gold is present in pyrite,pyrrhotite and arsenopyrite in the form of inclusion gold or ultramicroscopic gold.The monomer dissociated gold mineral was reversed to 49.44%,and it was deposited in the form of intercrystalline gold and fracture gold.The independent gold minerals are mainly electrum.A small amount of natural gold,kustelite.Gold fineness have a range of 420.09‰〜887.29‰,with an average of 701.33‰,and the gold fineness is low.The occurrence forms of gold minerals are various,mainly in the form of long-homed grains and round grains,and secondary in the form of branches and needles・The gold minerals in the ore are counted according to the number of particles,mainly micro and fine grain gold;according to the area statistics,coarse gold is the main.