Geophysical exploration of tungsten–copper deposit using the wide-field electromagnetic method

The Zhuxi tungsten–copper (W–Cu) deposit is a large skarn-type deposit. The buried depth of the primary ore body exceeds 1000 m, and the occurrence of the primary ore-controlling structure is unknown, highlighting the need for deep exploration. In this study, a wide-field electromagnetic method (WFEM) was applied for deep W–Cu mine detection in the Zhuxi mining area. The relationships among the target body's electrical properties, density, magnetism, and lithology were established using physical property data and a drill-resistivity sounding curve. Combined with known geological data, a two-dimensional geological–geophysical section was drawn, and a three-dimensional geological prospecting model was established based on the inversion of a three-dimensional section slice map of the WFEM. The results show that the WFEM can reveal the distribution pattern of the primary ore-bearing structure and horizon in this area. In addition, hydrothermal alteration activity related to deeply buried rock masses can be obtained, providing a strong basis for the study of metallogenic regularity at a 500–3000 m depth in the Zhuxi mining area and the prognosis for further prospecting.