Abstract: The Hongguixiang copper deposit is located in the southern part of the Huangling anticline, within the Yiqing 90 HS-13 geochemical anomaly zone, indicating strong mineral exploration potential. Ore bodies occur as lenticular and bed-like within the skarn of the contact zone between the black mica plagioclase gneiss (first member) and marble (second member) of the Proterozoic Huanglianghe Formation, as well as the fracture zones between marble layers. It is a distal skarn-type deposit formed during the late Jinning magmatic-mineralization event and is jointly controlled by lithology, structural features, and magmatic activity. Based on detailed geological data, high precision magnetic measurement data of the Hongguixiang copper deposit were interpreted using reduction to the pole, upward continuation, horizontal first-order derivative, and vertical second-order derivative calculation methods. The interpretation indicates that NW-trending structures are the primary ore-controlling and ore-hosting features, while NE-, and NS-trending structures play a secondary role. The marble-gneiss contact zones, NW-, NE-, and NS-trending structures, wall-rock alterations (skarnization, silicification, carbonatization), surface mineralization (malachitization, limonitization), and positive magnetic anomalies, along with linear and circular structures and their intersections, are key ore-finding indicators. The area north of the F2 fracture, marked by positive magnetic anomalies, and the region south of the F1 fracture with well-developed linear and circular structures, both show significant mineral potential.