UAV Magnetic Surveys for Mineral Exploration: Implications for Mine Planning and Safety

Abstract

Summary The increasing demand for minerals is causing environmental issues and reduced yields. Digitisation and automation can optimise mines, but challenges persist. UAV magnetic surveys can help collect high-resolution data for geological mapping and resource identification. This research focuses on the Tharisa Mine in South Africa, identifying shallow subsurface features and pathways for fluid migration. Airborne magnetic data was collected from 284 lines across 420 line-kilometres using a DJI M300 RTK drone platform. The data was processed using diurnal corrections, continuous readings, and filtering techniques to improve resolution and interpretability. The data collected from a study reveals high-frequency and high-amplitude responses related to infrastructure and cultural features. The study identifies faults as breaks in the magnetic signature of dykes or other magnetic geology and identifies remanent signatures of IRUPs. The University of British Columbia (UBC) MVI modelling was used to capture the magnetic susceptibility of magnetic features, revealing remanent responses of IRUPs and igneous intrusives. The data interpretation identified key geological features, including magnetic dykes, lithological trends, and IRUPs, affecting mining operations at Tharisa Mine. Cultural artifacts were separated and mapped. The results of the study provide valuable insights for future geophysical exploration and mine planning.