Application of CSAMT Numerical Simulation in the Exploration and Electrical Structure Interpretation of Jinding Lead-Zinc Deposit

In order to obtain the deep geological structure of the Jinding lead-zinc mine, and better understand the geological environment for mineralization in the deep part of the deposit, we have developed a new exploration mode on the Controlled Source Audio-frequency Magnetotellurics method (CSAMT). Firstly, we established a geophysical model based on the geological overview of the mineral deposit, and performed forward modeling using the coupled finite-infinite element method. On the one hand, we verified the effectiveness of CSAMT exploration based on the forward results, on the another hand, we designed the field acquisition parameters for CSAMT by referencing the forward modeling parameters. Secondly, we proposed a new method for evaluating CSAMT data. While quantitatively evaluating the signal strength through noise testing experiments, we also qualitatively evaluated the full characteristics of the CSAMT sounding curves through acquisition time testing experiments. Finally, using two-dimensional continuous medium inversion, we obtained the electrical distribution at a depth of 1km below each survey line in the Jinding lead-zinc mining area. By interpreting the electrical structure of the survey lines, we revealed the electrical characteristics of the lithologic system in the Jinding lead-zinc mining area, providing geophysical evidence for the study of the Jinding lead-zinc deposit.