## 5 Electrical Structure Interpretation of the Jinding Lead-Zinc Mine
### Interpretation of the Electrical Structure
As shown in Figure 16, The profile of Line 1900 is divided into three parts by faults. The low-resistivity zone at C6 in the eastern segment, compared with C1 in Line 2400 and C4 in Line 2100, indicates the stable electrical characteristics of the Guolang Formation in the north-south direction. However, the presence of the Bijiang Fault enhances the extent of the high conductor C6. The moderate resistivity in the middle mineral segment (Region V) shows slight differences from the electrical structures of the previous two survey lines. The western segment (Region VI) can be compared with Region III of Line 2100, with the difference being that Region VI has a wider distribution, and the underlying high conductor C7 can be connected to C5 in Line 2100. Lines 4500 and 3600 are located to the north of the Paomaping mineral segment, as shown in Figure 17. In the electrical profile of Line 4500, Region VII reflects the J-K stratigraphic system. Similar to the previously mentioned survey lines, the Guolang Formation exhibits low resistivity (C8) and extends deeply downward. Line 3600 crosses three stratigraphic zones from west to east, which are T3, E2, and J2. The lateral electrical gradient zones also separate the fault occurrences in the three exposed stratigraphic zones. The high conductor C9 represents an extension of the Guolang Formation and is connected to the deep part of Region VIII. The upper part may reflect an exotic thrust sheet, while the lower part belongs to the in situ system. The vertical electrical gradient zone in Region VIII indicates the depth of the thrust surface. Figure 16: Location of Line 1900 and its electrical structure profile. Figure 17: Location of (**a**) Line 3600 and (**b**) Line 4500 and their electrical structure profiles. Lines 1100 and 700 are located to the south of the Jinding mining area and to the west of the Nanchang mineral segment. As shown in Figure 18, the shallow high-resistivity bodies in Line 1100 outline the distribution of the exotic thrust bodies, while the in situ stratigraphic system may be located in Regions XI and XII. Line 700 is situated to the south of Line 1100 and can be divided into eastern and western segments. The low-resistivity background in Region XIII indicates that the exotic thrust system is relatively thin, with the in situ system dominating at depth. In Region XIV, the surface exposes strata of the Yunlong Formation, and the alternating high- and low-resistivity features may indicate that the stratigraphic system has undergone a certain degree of structural deformation or experienced large-scale fluid activity. Its electrical characteristics are similar to the mineralization system observed in the previously mentioned profiles. Based on the interpretation of the electrical structure from the seven surveyed lines, it can be understood that the lithological system of the Jinding lead-zinc mining area is mainly divided into three parts: the exotic stratigraphic system, the middle lithological system, and the in situ system. The electrical characteristics of the three lithological systems are as follows: the shallow exotic stratigraphic system is mainly characterized by a high-resistivity background; the middle lithological system, influenced by tectonic and fluid cementation, displays alternating high and low resistivity; and the in situ system is relatively complex, with the Yunlong Formation and the Guolang Formation exhibiting different electrical characteristics. The Yunlong Formation shows significant electrical variations, while the Guolang Formation maintains low resistivity and high conductivity, and high conductors (C1, C4, C6, C8, C9) are prevalent in the underlying geological bodies of the exposed areas of the Guolang Formation.