Horizontal Loop Electromagnetic and Self-Potential Signatures of Mineralized Structures: A Case Study from Abu Rusheid Area, Southeastern Desert

Abstract. Horizontal-loop electromagnetic (HLEM) and self-potential (SP) surveys were carried out at Abu Rusheid area, southeastern Desert, Egypt, to follow the extension of the exposed mineralized shear zone at depth and to detect any possible subsurface mineralization and its probable extension, as well as to reveal its structural setting, which may affect the distribution of radioactive and other associated minerals. The HLEM data were collected using four frequencies (110, 440, 3520 and 14080 Hz) and two coil separations (80 and 140 m). The interpretation of these data indicates the presence of two strong conductive zones trending in the NNW-SSE and NW-SE directions. These strong conductors are dissected by a moderate conductive zone trending in the NE-SW direction. The target parameters, as estimated from the HLEM data suggest that their widths range between 10 and 80 m, depths to the top are shallow and vary from 13.6 m to 58 m, di