红土型金矿床金的特征研究

 Study on Characteristics of The Gold in The Lateritic Gold Mine[KH+3mmD]

蛇屋山金矿为我国发现的第一个红土型金矿床，本文报道了该矿床金的特征的研究结果。运用电子探针、分析型透射电子显微镜等电子显微技术，查明矿床中金矿物的形态、颗粒大小以及化学成分等特征。研究表明，这些金以超显微金的形式存在于粘土矿物高岭石、水云母的晶体边缘，或混杂于褐铁矿中的针铁矿晶体集合体之间，少数呈褐铁矿的吸附相形式存在。根据分析电镜能谱分析及电子探针分析，这些金均为独立的自然金矿物，具有极高的成色。研究还表明，存在于粘土矿物边缘的超显微金呈物理吸附的方式或者机械混入物形式产出。

Shewushan is the first lateritic gold mine discovered in China.This paper reports the behavior of gold in the deposit according to the study with EPMA and AEM.It is mainly in submicro particles adsorbed at the crystal rims of clay mineral kaolinite and illite,or in micro particles included within limonite,little amount of gold is in the adsorbed phase of limonite.All the gold particles are native gold mineral with very high fineness according to EDS and EPMA analyses. Further study indicates that the gold particles within clay mineral are mechanical mixture or physical adsorbed at the crystal rims.