甘肃阴洼沟金矿床矿石特征及金的赋存状态研究

为了查清阴洼沟金矿床矿石特征及金的赋存状态,采用电子显微镜、多元素分析、电子探针能谱分析、电子探针波谱分析、物相分析等技术方法,对阴洼沟金矿床的金矿石、金矿物进行了系统的研究。研究结果表明:金矿石工艺类型主要有少硫化物蚀变岩型金矿石、少硫化物碎裂石英脉型金矿石和少硫化物铁白云石-钠长石-石英脉型3种,且有工业价值的元素只有Au;矿石中金属矿物含量较低,主要是褐铁矿、赤铁矿及黄铁矿,非金属矿物主要是石英,其次是绢云母、碳酸盐矿物、长石、绿泥石及高岭石;金矿物为自然金,金成色平均为975;金的嵌布类型以裂隙金为主,其次为包裹金,粒间金含量较少;自然金以细粒级明金为主,其次是微粒金。

Ore features and gold occurrence in Yinwagou Gold Deposit,Gansu Province

Characteristics of gold minerals and the occurrence of gold have been determined in Yinwagou Gold Deposit ,on the basis of systematic laboratory study ,such as electron microscope observation ,multi-element analysis ,e-lectronic microprobe energy spectrum analysis , electronic microprobe wavelength spectrum analysis , mineral phase a-nalysis .The result shows the gold ores mainly have three different mineralogical types ,that is low sulphide altered rock type gold ore,low sulphide cataclastic quartz-vein type gold ore and low sulphide ankerite -albite-quartz-vein type gold ore ,and Au is the only one industrially valuable element;the metallic mineral content in the ore is low and they are mainly limonite ,hematite and pyrite;non-metallic minerals are mainly quartz ,followed by sericite ,carbonate min-erals,feldspar,chlorite and kaolinite; gold minerals are native gold,and the average fineness of native gold is 975;The main type of dissemination is fissure gold ,followed by inclusion gold ,few in the form of the intergranular gold;grain size of native gold is dominated by fine visible gold ,followed by microgranular gold .Native gold is primarily visi-ble gold,followed by microscopic gold .