Abstract: Taking the newly discovered small fluorite deposit in Tianmen-Shanghu as the research object，the geological characteristics and metallogenic regularity of the deposit are systematically studied in order to evaluate the deep prospecting potential and guide the regional exploration and deployment. The results show that the deposit is located in the southeastern margin of the northern part of the Huichang red bed basin，which belongs to the important Ruijin-Huichang fluorite metallogenic belt in southern Jiangxi Province. The fluorite ore body is located in the andesite vein and the NE-trending fault tectonic belt near the contact zone with the rock mass. It is strictly controlled by the fault tectonic belt and belongs to the me‐ dium-low temperature hydrothermal filling vein fluorite deposit. In the area，the deposit is located in the Ruijin-Huichang fluorite metallogenic belt controlled by the Shicheng-Xunwu deep fault，which has simi‐ lar metallogenic geological conditions with the surrounding large deposits. The deep drilling data show that the ore body below the elevation of +140 m shows a trend of increasing thickness and grade，which is con‐ sistent with the deep mineralization characteristics of Huashi and Ruiyuan fluorite deposits in the adjacent area，indicating that there is a good prospecting space in the deep part. Therefore，it is considered that there is a great prospecting prospect in the deep part of the mining area，which is worthy of further deep prospecting work.

Key words: Huichang basin, fluorite mine, deposit characteristics, deep exploration