Abstract
The electromagnetic (EM) method is commonly used in mineral exploration due to the method’s sensitivity to conductive targets. Controlled source audio-frequency magnetotellurics (CSAMT) is developed from magnetotelluric (MT) method with an artificial EM source to improve the signal amplitude. It has been used for mineral exploration for many years. In this study, we performed a case study of the CSAMT application for the Eagles-Nest lead–zinc (Pb–Zn) ore deposits in Jianshui, China. The Eagles-Nest deposit is located in southwest in China in forest-covered complex terrain, making it difficult to acquire the geophysical data. Based on the previous dual-frequency induced polarization (IP) results, we designed four profiles for the CSAMT data acquisition. After data processing and inversion, we mapped the subsurface resistivity distribution. From the CSAMT results, we inferred the location of the ore body, which was verified by the drilling wells. The Pb–Zn ore body was found at a depth between 373.70 m to 407.35 m in the well.
Highlights
The Eagles-Nest lead–zinc (Pb–Zn) ore deposit is located in Jianshui, in Southwest China, in an area which is 90% covered by forests
Based on the results of that study we set up the Controlled source audio-frequency magnetotellurics (CSAMT) data acquisition design
The grid of dual-frequency interesting area was selected for the CSAMT measurement to detect the deep target
Summary
The Eagles-Nest lead–zinc (Pb–Zn) ore deposit is located in Jianshui, in Southwest China, in an area which is 90% covered by forests. The northeast is relatively flat; the western and southern mountains are cut by narrow and deep valleys. The elevation of the area ranges between m and 2503 m. It is difficult to carry out the ground geophysical surveys in this area because of the forest and steep mountains. During previous research 50 years ago, geologists investigated three profiles. The reports of that investigation were lost
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