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潼关小秦岭金矿田为我国金矿主要产地之一。矿区位于秦岭纬向构造带北缘太古界隆起。含金石英脉体产于太古界、太华群深变质岩系中,变质岩系主要由斜长角闪岩、黑云母或角闪斜长片麻岩夹薄层大理岩组成。含金矿物有硫化物类、氧化物类、碳酸盐类矿物。此外构造片岩、蚀变岩中也含少量金。各类矿物中Au、Ag的平均含量见表1。由表1可见,Au主要赋存于黄铁矿,其次是方铅矿,但因后者数量少,分布有限,因而无论在石英脉里,还是在构造片岩或蚀变岩中黄铁矿部都是主要载金矿物。
Tongguan Xiaoqinling gold field is one of the main gold producers in China. The mining area is located in the archean uplift on the northern margin of the zonal structural belt of the Qinling Mountains. The gold-bearing quartz veins are produced in the Archean and Taihua Group deep metamorphic rocks. The metamorphic rocks consist mainly of plagioclase amphibolite, biotite or hornblende plagioclase gneiss. Gold minerals are sulfide, oxides, carbonate minerals. In addition, the structure of schist, altered rocks also contain a small amount of gold. The average content of Au and Ag in various minerals is shown in Table 1. As can be seen from Table 1, Au mainly occurs in pyrite, followed by galena, but due to the small number and limited distribution of the latter, both in the quartz veins and in the tectonism of pyrite or altered rock Are the main gold-bearing minerals.