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本文据矿体所赋地层、岩性,将小南沟金矿段矿床类型定为构造蚀变岩型金矿,成矿构造带经历多期次构造运动和成矿作用,规模较大,延长约5Km,分多个成矿段,沿走向、倾斜线有分支、膨缩现象。后期破矿构造伴随有闪长岩脉的侵入,成矿作用以蚀变作用为主,其中黄铁矿化和黄铁绢英岩化与金矿化最为密切。通过对控矿主滑动面和成矿规律的研究,矿体分布具有规律性,工业矿体基本发育在主滑动面上盘,下盘仅发育一定厚度的低品位矿石。
According to the strata and lithology assigned by the ore body, the deposit type of Xiaonangou gold deposit is defined as tectonic altered rock type gold deposit. The ore-forming tectonic belt undergoes multi-stage tectonic movement and metallogenesis, with a larger scale and an extension of about 5Km, divided into multiple ore-forming sections, along the strike, inclined line branches, swelling phenomenon. In the later stage, the ore-bearing structure was accompanied by the diorite vein intrusion, and the mineralization was dominated by alteration. The pyritization and pyritization of pyrite were the most closely related to the gold mineralization. Through the study of ore-controlling main sliding surface and metallogenic regularity, the distribution of ore body is regular. The industrial ore body basically develops on the main sliding surface, and the lower plate only develops a certain thickness of low-grade ore.