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利用光薄片鉴定、X射线衍射、主要化学成分分析、物相分析、扫描电镜背散射和载金矿物能谱分析等方法,对滇西北衙金多金属矿床万硐山矿段原生矿石中金等主要元素的赋存状态进行研究。研究表明,金的赋存形式主要有裂隙金、粒间金、包裹金,少量连生金。载金矿物以磁铁矿、菱铁矿为主,所占比例达到84.23%,其次是黄铁矿、黄铜矿、方铅矿、辉银矿、斑铜矿、磁黄铁矿、闪锌矿、斜方辉铅铋矿、石英和黑云母等。自然金的粒度按金矿物面积统计主要以显微极微粒金(0.2~5μm)、显微微粒金(5~10μm)、显微细粒金(10~20μm)及显微中粒金(20~50μm)为主,分别占17.87%、28.16%、28.19%和25.78%。按颗粒数量统计,以显微极微粒金(0.2~5μm)为主,占89.94%,其他3个粒级分别占6.51%、2.31%和1.18%,显微极微粒金粒数量多但极细,质量占比非常小,而显微微粒金—显微中粒金数量少颗粒相对大,质量占比大。电子探针和物相分析显示,矿石中金主要以独立矿物存在,包括大量的自然金和少量的银金矿,金的平均成色为890,金矿物的成色和特征反映金矿形成条件为高—中温和中等形成深度以及成矿流体主要属岩浆热液。
In this paper, we use the methods of identification, X-ray diffraction, chemical composition analysis, phase analysis, scanning electron microscopy backscattering and gold-bearing mineral spectrum analysis to study the gold content of the primary ore of Wandongshan ore deposit in the northwestern Yunnan Yawei polymetallic deposit The main elements of the occurrence of state research. Studies have shown that the main forms of gold are fissure gold, grain gold, parcel gold, a small amount of gold even. The gold-bearing minerals are mainly magnetite and siderite, accounting for 84.23% of the total, followed by pyrite, chalcopyrite, galena, galena, burnt copper, pyrrhotite, Ore, Oblique Fai lead bismuth, quartz and biotite and so on. The grain size of natural gold according to the statistics of the gold mineral area is mainly based on the microparticulate gold (0.2-5 μm), the microparticulate gold (5-10 μm), the microparticulate gold (10-20 μm) and the microscopic granular gold ~ 50μm), accounting for 17.87%, 28.16%, 28.19% and 25.78% respectively. According to the statistics of the number of particles, the microparticulate gold (0.2-5 μm) was the main component, accounting for 89.94%, the other three fractions accounted for 6.51%, 2.31% and 1.18% respectively. , The proportion of quality is very small, and the microscopic gold particles - the number of small particles in the microstructure is relatively large, accounting for a large proportion of quality. Electron probe and phase analysis show that the gold in the ore mainly exists as a separate mineral, including a large amount of natural gold and a small amount of silver-gold ore, the average fineness of gold is 890, the fineness and characteristics of the gold mineral reflect the high gold formation conditions Moderate moderate depths of formation and ore-forming fluids are mainly of magmatic hydrothermal fluids.