湖南水口山矿田仙人岩金矿床矿体特征及金的赋存状态研究

仙人岩金矿床位于水口山铅锌金银多金属矿田西南方向,为浅层低温热液+后期氧化富集型矿床,规模达中型。矿体形态复杂,呈脉状、透镜状、楔形状、囊状,分枝复合、膨大缩小、尖灭再现特征明显。运用电子显微镜、扫描电镜、X射线能谱仪等测试分析手段和方法,对金矿石中金的赋存状态进行了研究。结果表明,矿石主要为氧化矿石,金矿物的成色不纯,主要为自然金,少量银金矿,多数的金粒还含微量的铂;金矿物的形态简单,以粒间金为主,次为裂隙金,少量包裹金;金粒度跨度大,主要为中细粒,次为粗粒、微细粒,巨粒金最少。

Orebody characteristics and occurrence of gold in Xianrenyan gold deposit, Shuikoushan ore field, Hunan Province

The Xianrenyan gold deposit is located in the southwest of the Shuikoushan Pb-Zn-Ag-Fe-Fe-Cu polymetallic ore field. It is a shallow low-temperature hydrothermal + late oxidation-rich deposit, and its scale is medium size. The ore body is a complex in shape, vein-like, lenticular, wedge-shaped, cystic, and its branches present complex form, characteristics of enlargement and shrinkage,as well aspinch-out reappearance are obvious. Tst analysis means and motheds of electron microscopy, scanning electron microscopy, and X-ray energy dispersive spectroscopy were used to investigate the occurrence of gold in gold ore deposits. The results show that the ore in the deposit is mainly oxidized ore, and the color of the gold mineral is impure, mainly natural gold, a small amount of silver and gold minerals, and most of the gold particles also contain trace amounts of platinum. The morphology of gold minerals is simple, mainly intergranular gold, followed by fissure gold, and a small amount of gold inclusions. The gold particle size spans a big range, mainly medium and fine grains, followed by coarse grains, fine grains, and the least gold grains.