A Near-Source Electromagnetic Method for Deep Ore Explorations

Xue, Gang; Chen, Weiying; Wu, Xiaofeng; Yan, Shu; Guo, Wenbo

doi:10.3390/min12101208

Cited by 5 publications

(2 citation statements)

References 12 publications

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“…The time-domain (TD) CSEM method was used to investigate subsurface profiles between the Main and Eastern mines. It utilizes a long grounded wire as the source to transmit a bipolar square-wave current and then observes the secondary induced electromagnetic field within a certain offset distance from the source [44][45][46][47][48]. It is common to observe the vertical induced voltage (Vz(t)) by loop coils or magnetic rods.…”

Section: Data Acquisitionmentioning

confidence: 99%

Electrical Structure between the Main and Eastern Deposits of the Bayan Obo Mine: Results from Time-Domain CSEM Methods

Chen,

Song,

et al. 2024

Minerals

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Bayan Obo is a well-known polymetallic deposit containing significant quantities of rare earth elements, niobium, thorium, and iron. However, the epoch in which mineralization occurred and the mineralization process are still debated due to the complex nature of its mineralization and geological evolution. Inadequate geophysical exploration has further contributed to this lack of clarity surrounding critical issues, such as the deep link between the main orebody and the eastern orebody, the form and distribution of the extensive dolomite, and the geologic structures in the area. Therefore, we implemented the time-domain controlled-source electromagnetic method (CSEM) to acquire electrical structures at depths down to 2.5 km between the Main and Eastern mines. According to the inverted resistivity structure, in conjunction with existing geological and drilling data, we classified the main lithologies and faults based on their resistivity characteristics. Overall, the mineralized carbonatite reflects high to moderately high resistivity. The mineralized carbonatite dips overall from north to south, with a maximum extension depth not exceeding 1.5 km, and its range of occurrence is controlled by nearly east–west-striking faults distributed along the bounding line between the roof and floor rocks. The Main and Eastern mines are connected at depth, but the morphology and position of the ore bodies have significantly changed due to multiple phases of tectonic activity. The electrical structure does not reveal any obvious syncline structures, further refuting the traditional view that the Bayan syncline controls ore formation.

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Section: Data Acquisitionmentioning

confidence: 99%

Electrical Structure between the Main and Eastern Deposits of the Bayan Obo Mine: Results from Time-Domain CSEM Methods

Chen,

Song,

et al. 2024

Minerals

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“…It has several excellent characteristics, including low cost, high work efficiency, great detection depth, and minimal susceptibility to terrain effects. Consequently, it has found extensive application in the surveying of mineral resources, engineering exploration, and environmental monitoring worldwide [1,2]. However, the EM method often faces challenges in detecting and discovering mineral deposits over water-covered areas, such as brine resources in or under salt lakes [3] and lithium-boron deposits and potassium deposits under large salt lakes [4,5].…”

Section: Introductionmentioning

confidence: 99%

Simulation and Observations of Audio Magnetotelluric Measurements over Water-Covered Areas

et al. 2023

Minerals

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Electromagnetic (EM) surveys play a significant role in mineral exploration. However, the EM method often faces limitations when investigating minerals in areas covered by rivers, lakes, or other water bodies. This paper introduces audio magnetotelluric (AMT) observation technology that utilizes separated electric and magnetic channels to deal with this challenge over water-covered areas. The study analyzes and discusses the characteristics of the relative error of the magnetic field through forward simulation. The observation and profile experiments were conducted at the estuary of a river in Liaoning Province, China, and high-quality data in the river and the pseudo-geoelectric section of the underwater space were successfully obtained. The results demonstrate the feasibility and effectiveness of the AMT observation technology over water-covered areas, emphasizing the importance of locating the magnetic channel in a quiet zone at a certain distance from the shore. This configuration helps reduce the influence of resistivity differences between water and shore, ultimately improving data quality and accuracy. The research suggests that the AMT observation technology, utilizing separated electric and magnetic channels, has the potential for further improvement and can serve as a valuable guide for mineral exploration over water-covered areas.

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Remote sensing-based structural and lithological mapping for prospecting polymetallic mineralization at Xiaoshan region, China

Hussain,

Li,

Beshr

et al. 2024

Earth Sci Inform

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A Near-Source Electromagnetic Method for Deep Ore Explorations

Cited by 5 publications

References 12 publications

Electrical Structure between the Main and Eastern Deposits of the Bayan Obo Mine: Results from Time-Domain CSEM Methods

Electrical Structure between the Main and Eastern Deposits of the Bayan Obo Mine: Results from Time-Domain CSEM Methods

Simulation and Observations of Audio Magnetotelluric Measurements over Water-Covered Areas

Remote sensing-based structural and lithological mapping for prospecting polymetallic mineralization at Xiaoshan region, China

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