## 5 Electrical Structure Interpretation of the Jinding Lead-Zinc Mine
### Interpretation of the Electrical Structure  
The relative positions of the survey lines on the plane are shown in Figure 8. Line 4500 and Line 3600 are located on the north side of the PaoMapping mining area; Line 2400, Line 2100, and Line 1900 pass through the Jiayashan mining area; and Line 1100 and Line 700 are located on the west side of the Nanchang mining area. The north-south span of the survey lines is approximately 3.8 km, and all survey line profiles are oriented east-west, which provides assistance for comparing the three-dimensional spatial positions of the underground electrical structures. Due to the significant differences and distinct contrasts in resistivity presented in the two-dimensional continuous medium inversion results, as well as the abundant details in the electrical structures, the interpretation of the electrical structures primarily relies on the two-dimensional inversion results. 1. Line 2400  
Line 2400, Line 2100, and Line 1900 are located in the Jiayashan mining segment of the Jinding mining area. As shown in Figure 14, the entire profile of Line 2400 can be divided into three parts, with the western and eastern segments being high-conductivity areas and the middle segment (Region I) being a high-resistivity area. Region I is the mineral occurrence segment, which exhibits alternating high and low resistivity from shallow to deep, reflecting a complex structural rock system. The eastern segment is located below the outcropping area of the Guolang Formation (E2g), which is mainly composed of alternating layers of argillaceous siltstone and siltstone-bearing mudstone, with a high conductor, C1, underlying it. The strata exposed in the western segment belong to the  
Figure 13: Comparison of the shallow electrical structure with the physical properties of drill core data for Line 1100. Yunlong Formation (E2y), with normal lithology consisting of alternating layers of muddy conglomerate and argillaceous siltstone, and there is a high conductor, C2, present in the deep part. Based on the electrical characteristics of the rocks, the presence of high conductors C1 and C2 indicates that both sets of strata have undergone varying degrees of disruption and modification, resulting in increased conductivity compared to intact lithologies. From the electrical gradient zones, it can be observed that exogenous rock slices have been thrust from west to east, overlying the Yunlong Formation strata. The mineral bodies are controlled by the thrusted base, while the Guolang Formation contacts the exogenous rock slices through high-angle strike-slip faults. Line 2100 is the longest survey line, and it is located to the south of Line 2400. As shown in Figure 15, the electrical structure of Line 2100 is complex, as it is separated by five faults. Similar to Line 2400, Region II exhibits a high-resistivity background with alternating high and low resistivity from shallow to deep. However, the exposed area of the Yunlong Formation in Region IV on the west side is different from the western segment of Line 2400 that shows high resistivity, which reflects a relatively intact J-K stratigraphic system. The difference between Region III and Line 2400 is that although both are exposed areas of the Yunlong Formation, their electrical characteristics are completely different. The high-resistivity background indicates that the deep part of this region may have structural features similar to Region II. However, the presence of high conductor C5 corresponds to C2 in Line 2400. Similarly, high conductor C4 corresponds to C1 in Line 2400, reflecting the Guolang Formation. Additionally, high conductor C3 is present on the west side of the Fengzishan mineral segment, which requires further investigation. Figure 14: Location of Line 2400’s survey line and its electrical structure profile. Figure 15: Location of Line 2100 and its electrical structure profile. Line 1900 is located to the south of Line 2100 and also crosses the Jiayashan mineral segment.