New Findings and Meaning of Gold Mineralization in the Deep of the Banxi Antimony Deposit in Hunan Province

板溪锑矿床位于湖南省桃江县，是湘中地区有名的锑矿床之一。近年来，通过地质调查和矿床勘探工作，在矿区深部发现了金矿化迹象，为该矿床的深部成矿远景预测提供了新的线索。在矿床地质特征、锑金矿化特征的系统分析基础上，结合地球化学方法，发现了板溪锑矿床Au与Sb无明显的负相关关系，与Au相关性最为密切的元素是As、Mo、Co，2号脉带伴有金矿化的富集。显微研究及电子探针分析，发现金主要以包裹金的形式存在于黄铁矿和毒砂中。通过对矿床的构造叠加晕方法研究，预测板溪锑矿床金矿化的深部2-3、2-2号脉南西侧可能存在更大规模和更高品位的锑金矿体，深部具有良好的找金潜力。经工程验证，在板溪锑矿区−800 m深部打到锑金工业矿体，这些研究成果为板溪锑矿床的后续矿床勘探和开发提供了重要的理论和实践依据。The Banxi antimony deposit is located in Taojiang County, Hunan Province, and is one of the well-known antimony deposits in the central region of Hunan. In the recent geological surveys and exploration of the deposit, signs of gold mineralization have been discovered in the deep part of the ore deposit, providing new clues for the deep ore-forming prospects of the deposit. Based on a systematic analysis of the geological and antimony-gold mineralization characteristics of the deposit, combined with geochemical methods, it has been found that there is no significant negative correlation between Au and Sb in the Banxi antimony deposit, and the elements most closely related to Au are As, Mo, and Co, with the enrichment of gold mineralization in vein zone 2. Microscopic studies and electron probe analysis have shown that gold mainly exists in the form of inclusion in pyrite and arsenopyrite. Through the study of the superimposed alteration halo of the deposit, it is predicted that there may be larger-scale and higher-grade gold-antimony ore bodies on the southwest side of veins 2-3 and 2-2 in the deep part of the Banxi antimony deposit, with good potential for gold exploration in the deep part. Through engineering verification, it has been discovered that the Banxi antimony deposit has an industrial ore body of antimony and gold at a depth of −800 meters, providing an important theoretical and practical basis for the subsequent exploration and development of the deposit.