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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。笔者通过显微镜观察、电子探针和扫描分析等综合分析技术,确认金矿床中矿物组成相当丰富,既有大量硫化物、硫盐、氧化物、硫酸盐、碳酸盐、钨酸盐,又有碲化物、自然金属及多金属互化物。除常见矿物为自然金、黄铁矿、黄铜矿、黝铜矿、方铅矿、闪锌矿、辉锑矿、石英、白钨矿、方解石、菱铁矿、铁白云石和重晶石外,笔者还鉴定出在卡林型金矿床较少见的一些矿物,如硫铜锑矿、车轮矿、辉锑铅矿、辉钼矿、碲汞矿、碲镍矿、Cu-Zn-Ni-Sn-Fe的金属互化物和白钨矿等。矿石中矿物种类较多,组成较复杂以及存在显微自然金,构成寨上金矿床的一大特色。赋矿围岩中含Fe碳酸盐矿物溶解释放Fe以及溶解Fe的大量硫化物化,是寨上金矿床中存在显微可见自然金的最重要因素和金沉淀富集的有利条件。
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. Through comprehensive observation techniques such as microscopic observation, electron probe and scanning analysis, the author confirmed that the gold mineralization is quite rich in mineral composition, including a large number of sulfides, sulfur salts, oxides, sulfates, carbonates and tungstates, Tellurides, natural metals and multimetallics. In addition to the common minerals of natural gold, pyrite, chalcopyrite, tetrahedrite, galena, sphalerite, stibnite, quartz, scheelite, calcite, siderite, iron dolomite and barite , The author also identified some of the less common minerals in Carlin-type gold deposits such as copper-copper-antimony ore, wheeled ore, stibnite, molybdenite, tellurite, tellurium-nickel ore, Cu- Sn-Fe intermetallics and scheelite and the like. Ore minerals more types, more complex and the presence of micro-natural gold, Zhaishang gold deposit constitutes a major feature. The ore-forming rocks containing Fe carbonate minerals dissolve to release Fe and dissolve Fe in a large amount of sulfidation is the most important factor for the existence of microscopic-visible natural gold in Zhaishang gold deposit and the favorable conditions for gold precipitation enrichment.