Electromagnetic methods for mineral exploration in China: A review

Guo, Zhenwei; Xue, Gang; Liu, Jianxin; Wu, Xiaofeng

doi:10.1016/j.oregeorev.2020.103357

Cited by 68 publications

(19 citation statements)

References 54 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The electromagnetic method plays an important role in mineral exploration and has been widely used in searching for metal resources such as gold, copper, molybdenum, lead-zinc, bauxite, and uranium [42][43][44]. In this paper, detailed field geological surveys and AMT survey were carried out to investigate the Jianbeigou gold deposit in the Qinling metallogenic belt.…”

Section: Methodsmentioning

confidence: 99%

Application of the AMT Method to Gold Deposits: A Case Study in the Qinling Metallogenic Belt of North China Craton

Zeng

Zhu

et al. 2021

Minerals

View full text Add to dashboard Cite

The Lushi gold polymetallic ore-concentration area, located in the southern margin of North China Craton, is an important polymetallic ore district in the Qinling metallogenic belt. The Jianbeigou gold deposit is an important quartz vein type gold deposit in this district. In order to reveal the geological structure of the Jianbeigou gold deposit to guide deep prospecting, the EH4 conductivity image system was used in the Jianbeigou area. The sections obtained by the audio magnetotellurics method (AMT) indicate that the steeply dipping low resistivity zone in the area has a good corresponding relationship with the location of the known shallow ore bodies, and an extension in the deep. The low resistivity anomaly zone obtained by the inversion results are well correlated with the gold mineralization zone of the ore bodies, indicating good deep prospecting and exploration potential in this area. Based on geological and geophysical evidences, this paper inferred the possible occurrence location and depth range of the buried ore bodies. The AMT survey results reflect good exploration potential of the mining area and provide a geophysical basis for deep prospecting.

show abstract

Section: Methodsmentioning

confidence: 99%

Application of the AMT Method to Gold Deposits: A Case Study in the Qinling Metallogenic Belt of North China Craton

Zeng

Zhu

et al. 2021

Minerals

View full text Add to dashboard Cite

show abstract

“…The different materials that compose the local geological context can be distinguished from the contrast between their physical properties, whose parameters can be measured using indirect investigation methods, which include geophysical methods. Geophysical surveys are widely used and they are applied to a great number of scientific fields, as mineral prospection studies [34][35][36], petroleum geology [37][38][39][40], geotechnical engineering [41][42][43], and hydrogeological and environmental studies [44][45][46]. They are usually associated with conventional direct investigation methods, like monitoring wells, drillings, soil probing and trench [47][48][49].Considering all kinds of geophysical methods, the geoelectrical ones are the most valuable for environmental studies, especially the direct current (DC) resistivity method.…”

Section: Methodsmentioning

confidence: 99%

Hydrogelogical characterization of a waste rock pile and bedrock affected by acid mine drainage from geophysical survey

et al. 2020

View full text Add to dashboard Cite

Mining activities are known for the profound changes they cause in the environment, especially those related to environmental liabilities generated by these enterprises. One major concern of this sector relies on the acid mine drainage (AMD) process, which is formed by the exposure of sulfide minerals to oxidizing conditions. As a result, the production of low-pH saline waters favors the mobilization of heavy metals to the environment. In the last decades, the characterization and monitoring of contamination plumes have become more feasible due to the application of geophysical tools, more precisely the DC resistivity geophysical method. Thus, the aim of the present study is the application of electrical resistivity tomography to understand the hydrogeological dynamic of a waste rock pile in the Osamu Utsumi uranium mine, with the identification of preferred groundwater and AMD flow. The analysis of the 2D geophysical products allowed the differentiation of high salinity water accumulation zones (< 40 Ω m) in the interior of the pile. Likewise, the evaluation of the pseudo-3D model generated by the interpolation of 2D sections was crucial for the recognition of low resistivity zones within the bedrock, possibly controlled by fractures that work as recharge zones between the waste rock pile and the fractured aquifer. The identification of discharge and recharge zones related to the fractures system is a fundamental step for planning and actions to prevent water-sulfides interaction process, which is responsible for the generation of AMD, and also the installation of groundwater pumping systems.

show abstract

“…Transient electromagnetic method (TEM) is also called time domain electromagnetic method, which first creates the main magnetic field coil and then interrupts it suddenly. According to Faraday law of electromagnetic induction, electric conductor produces secondary induced currents on ground or coal mine, because the attenuation law of secondary magnetic field is related to the conductivity of underground geological body; the better the conductivity is, the slower the attenuation rate is [22].…”

Section: Detection Principlementioning

confidence: 99%

Multifield Environmental Analysis and Hazards Prevention of Steeply Inclined Deep Coal Mining

Lai

Dai

et al. 2021

Advances in Civil Engineering

View full text Add to dashboard Cite

Due to the different in-situ stress level, mining stress state, and surrounding rock properties of steeply inclined deep coal mining, the mutation mechanism of underground engineering rock mass is complex. This paper studies the cause and control of mining disaster of steeply inclined deep coal resources in Wudong coal mine. The results show that the structural field is the key of multifield analysis, and particularly a large area of suspended roof is easy to expand energy and induce dynamic hazards. By means of borehole television- (BT-) transient electromagnetic (TEM) detection, it is found that there are hidden dangers of roof safety and suspected water hazards in Wudong coal mine, and the roof above the detection area (+575 m south roadway to 2250–2600 m) is in a suspended state; there is a suspected water-rich area in the range of 2320–2340 m and 2390–2400 m, and the lowest vertical height is +613.8–+615.5 m. Exploring and releasing the water in the aquifer effectively reduced the water pressure; in +575 m south roadway, +587 m measure roadway, and blasting chamber, the suspended roof blasting holes are constructed. Microseism- (MS-) TEM monitoring shows that the apparent resistivity fluctuates significantly, the microseismic energy and events have been significantly reduced, and it is maintained at a low level for two consecutive weeks, confirming the effectiveness of the stable release of the high-stress roof in the +575 m near stope area; at the same time, the safeguard measures for long-term roof dynamic monitoring are constructed.

show abstract

Electromagnetic methods for mineral exploration in China: A review

Cited by 68 publications

References 54 publications

Application of the AMT Method to Gold Deposits: A Case Study in the Qinling Metallogenic Belt of North China Craton

Application of the AMT Method to Gold Deposits: A Case Study in the Qinling Metallogenic Belt of North China Craton

Hydrogelogical characterization of a waste rock pile and bedrock affected by acid mine drainage from geophysical survey

Multifield Environmental Analysis and Hazards Prevention of Steeply Inclined Deep Coal Mining

Contact Info

Product

Resources

About