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位于西秦岭礼(县)-岷(县)成矿带西段的寨上金矿床是近年发现的一个大型微细浸染型金矿。在研究甘肃寨上金矿床物质组分的过程中,采用显微镜观察、电子探针扫描、化学分析等综合分析技术发现了显微自然金颗粒。矿石中的自然金颗粒形态多样,粒度变化较大(5～150μm)。电子探针分析结果显示,自然金中Au=88.23%～92.73%,Ag=7.41%～9.08%,为含银自然金,成色905～926。金的载体矿物有砷黄铁矿、方铅矿、碲汞矿、铁白云石等。金的嵌布类型有粒间金、裂隙金和连生金3种。赋矿围岩中含Fe碳酸盐矿物溶解释放出Fe和溶解Fe的大量硫化物化,可能是寨上金矿床中存在显微可见自然金的最重要因素。
The Zhaishang gold deposit, located in the western Qinling Li county ())) - Min (county) metallogenic belt, is a large finely disseminated gold deposit discovered in recent years. During the study of the material composition of Zhaishang gold deposit in Gansu Province, microscopic natural gold particles were found through comprehensive analysis techniques such as microscope observation, electron probe scanning and chemical analysis. The natural gold particles in the ore are diverse in shape and vary in size (5-150μm). The results of electron probe analysis showed that Au = 88.23% ~ 92.73%, Ag = 7.41% ~ 9.08% in natural gold. Gold carrier minerals arsenopyrite, galena, telluride mercury, iron dolomite and so on. There are three types of gold inlay, such as grain gold, fissure gold and silver. The dissolution of Fe-bearing carbonate minerals in the ore-forming rocks releases a large amount of sulfidation of Fe and dissolved Fe, which may be the most important factor for the existence of microscopic-visible natural gold in the Zhaishang gold deposit.