Advances in Magnetic and Electromagnetic Techniques for Mineral Exploration: Enhancing Resource Discovery

A special issue of Minerals (ISSN 2075-163X). This special issue belongs to the section "Mineral Exploration Methods and Applications".

Deadline for manuscript submissions: 30 March 2025 | Viewed by 1499

Special Issue Editors


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Guest Editor
Geo Data Solutions GDS Inc., Laval, QC, Canada
Interests: exploration geophysics; electromagnetic and potential field methods; geology

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Guest Editor
Institute of Geological Sciences, Polish Academy of Sciences, 31-002 Kraków, Poland
Interests: tectonics; exploration geophysics; structural geology; minerals; basin analysis

Special Issue Information

Dear Colleagues,

Magnetic and electromagnetic methods are popular among the geophysical methods for mineral exploration. Their application has evolved with technological advance and computer science revolution. In recent years, various developments have occurred on the technology side including miniaturizing sensors, increasing system reliability, and introducing computer-controlled transmitter, receiver, and data acquisition. Electromagnetic airborne surveys are today mainly conducted from helicopters, while there are still attempts to combine ground and airborne surveys. Drones are becoming popular, particularly for magnetic surveys. Three-dimensional inversion is almost systematically carried out for magnetic surveys, while two-dimensional filtering techniques are still used to analyze aeromagnetic data. However, 3D technology has not been used as intensively for electromagnetic interpretation since 1D inversion is still popular. Recent developments have been inspired by machine learning techniques and a better understanding of the physical properties of the targets. This Special Issue is an opportunity to valorize recent developments that can increase the resource discovery of mineral, either with technological advances, interpretation methods, or physical properties. This is open to borehole, ground, and airborne magnetic and electromagnetic methods, as well as case histories.

Dr. Marc A. Vallée
Prof. Dr. Stanisław Mazur
Guest Editors

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Keywords

  • magnetic methods and electromagnetic methods
  • data acquisition
  • geophysical modeling and inversion
  • borehole, ground, and airborne geophysics
  • magneto-telluric
  • mineral exploration
  • case histories
  • physical properties

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Published Papers (2 papers)

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Research

16 pages, 17436 KiB  
Article
Airborne Natural Total Field Broadband Electromagnetics—Configurations, Capabilities, and Advantages
by Alexander Prikhodko, Andrei Bagrianski and Petr Kuzmin
Minerals 2024, 14(7), 704; https://doi.org/10.3390/min14070704 - 11 Jul 2024
Viewed by 552
Abstract
The airborne electromagnetic system MobileMT exploits natural fields in a broadband frequency range with offset measurements of magnetic and electric field variations. It was introduced in 2018 and has since been developed in various configurations, each tailored to meet the demands of different [...] Read more.
The airborne electromagnetic system MobileMT exploits natural fields in a broadband frequency range with offset measurements of magnetic and electric field variations. It was introduced in 2018 and has since been developed in various configurations, each tailored to meet the demands of different exploration tasks, varied terrains, and geoelectrical conditions and support time-domain data with controlled primary field sources. There are four distinct airborne systems: the original MobileMT; the lighter configuration, MobileMTm; the configuration for a drone carrier, MobileMTd; and the innovative time-domain AFMAG hybrid, TargetEM. The paper describes the technical features of each system, their differences and inherent strengths, the optimal usage conditions, and insights into their applications under different conditions across various exploration tasks. Several field case studies are provided to support the natural field electromagnetics capabilities of recovering geological structures in a wide depth range, beginning from the near surface, and address the impact of parasitic IP effects on time-domain data. Full article
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16 pages, 7506 KiB  
Article
Application of Integrated Geological and Geophysical Surveys on the Exploration of Chalcedony Deposits: A Case Study on Nanhong Agate in Liangshan, China
by Shengping Gong, Keqiang Zhao, Mingming Wang, Shengwu Yan, Yong Li and Jianzhou Yang
Minerals 2024, 14(7), 677; https://doi.org/10.3390/min14070677 - 28 Jun 2024
Viewed by 484
Abstract
Nanhong agate, esteemed for its vivid color and natural shine, is experiencing a scarcity in supply despite its high demand. The primary deposits of agate, typically found near the surface, have not been extensively explored due to the predominance of traditional manual excavation [...] Read more.
Nanhong agate, esteemed for its vivid color and natural shine, is experiencing a scarcity in supply despite its high demand. The primary deposits of agate, typically found near the surface, have not been extensively explored due to the predominance of traditional manual excavation methods. This research examined the Nanhong agate deposits in the Zhaojue–Meigu region of Liangshan, China, employing the integration of geological and geophysical surveys. Field geological surveys allowed us to outline the general areas where agate is found. Following this, using magnetic surveys, vertical electrical sounding, and controlled-source audio magnetotellurics, agate deposits were located within the conglomerate layer of the second member of the Feixianguan Formation from the Lower Triassic period at depths of less than 100 m. Our results identify mineralized layers, Xuanwei Formation mudstone, and the underlying bedrock, thus supporting the creation of a mineral prediction map. This research provides essential insights and guidance for agate exploration and the development of associated mineral resources. Full article
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