Geological Characteristics and Metallogenic Geological Conditions of the Woxi Gold−Antimony−Tungsten Deposit in Yuanling, Hunan Province

The Woxi gold antimony tungsten deposit is an important and characteristic gold antimony tungsten symbiotic super large deposit in the arc turning end of Xuefeng metallogenic belt in Hunan province.The deposit controlled by NWW trending faults, and hosted in purplish discoloration sericite slate in the middle and upper part of Madiyi formation of the Proterozoic Banxi group. The genesis of the deposit is metamorphic hydrothermal quartz vein type gold antimony tungsten deposit. Based on the field investigation and previous research results, this paper systematically analyzes and summarizes the geological characteristics, wall rock alteration and metallogenic geological conditions of the deposit. The wall rock alteration in the mining area is strong, pyritization and silicification are closely related to the gold antimony tungsten mineralization. In addition, there are illitization, carbonation and chloritization . The mineralization of the deposit can be divided into two metallogenic periods: hydrothermal metallogenic period and supergene oxidation period. The hydrothermal metallogenic period of the deposit can be divided into four stages: quartz–scheelite–pyrite stage, natural gold–pyrite–quartz stage, stibnite–fangantimony gold–quartz stage and carbonate–quartz stage. The deposit is mainly controlled by stratum , structure and wall rock alteration, which is the product of the coupling of stratum, structure and wall rock alteration under favorable metallogenic conditions. Among them,stratum provides material source for mineralization, primary fault structure provides migration channel for metallogenic fluid, and secondary interlayer faults and joint fissures provide ore holding space. Wall rock alteration is the necessary condition for metallogenic enrichment, and the three factors are also the direct signs of ore prospecting in the mining area.