Discovery of a hidden BIF deposit in Anhui province, China by integrated geological and geophysical investigations

Xue, Gang; Gelius, Leiv‐J.; Sakyi, Patrick Asamoah; Zhou, Nannan; Chen, W.Y.; Su, Benyu; Li, Hu; Zhong, Hua-sen; Su, Yanan

doi:10.1016/j.oregeorev.2014.05.007

Cited by 36 publications

(5 citation statements)

References 8 publications

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“…TEM has the advantages of flexible field source, diverse methods, stability and high efficiency. It has been developed as an important method for detecting oil and gas (Anton et al, 2010; Cairns et al, 1996; Meyer et al, 2016), metal and non-metal minerals (Asten and Duncan, 2012; Cai et al, 2017; Chen et al, 2010; Gao et al, 2016; Qin et al, 2019; Xue et al, 2014; Xue et al, 2020; Xue and Yu, 2017; Yu et al, 2007; Zhi et al, 2016). TEM has been widely applied in the fields of geological structure research (Hisatoshi et al, 2011; Wu et al, 2020), and geothermal exploration (Cheng and Gao, 2011; Di et al, 2019; Tohru et al, 1998; Zhou et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

Exploring weathered and oxidized zones of coal seams using the transient electromagnetic method

Yang

Xiong

Peng

et al. 2022

Energy Exploration & Exploitation

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Once a coal seam has been weathered and oxidized, the quality of the coal is lost and the coal resources are wasted. At the same time, new risks are introduced to the safe operation of the coal mine. Therefore, it is critical to determine the extent of the weathered and oxidized zone in the coal seam. This paper depicts the electromagnetic characteristics of the weathered and oxidized zone of coal seams, briefly introduces the method of detection by transient electromagnetic method (TEM) and the data processing steps, and performs the numerical simulation for the simplified resistivity model of weathered and oxidized zone in a coal seam. It is observed that after the coal seam has been weathered and oxidized, the electromagnetic characteristics (secondary field potential and resistivity) will be dramatically affected, namely high secondary field potential and low resistivity. For experimental verification purposes, this study selects the test project of the Shixin Minefield in Shanxi, China as an example, and the accuracy for the detection of the weathered and oxidized zone of the coal seam using TEM is successfully verified.

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Section: Introductionmentioning

confidence: 99%

Exploring weathered and oxidized zones of coal seams using the transient electromagnetic method

Yang

Xiong

Peng

et al. 2022

Energy Exploration & Exploitation

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“…In this research study, in accordance with the characteristics of the ore‐controlling system and the basic geological law of the gold–polymetallic deposits in the Xiaoshan District, as well as the restrictions of topography, geomorphology, vegetation, and so on, a geophysical method and a ground‐wire short‐offset TEM technique (SOTEM) were adopted. Then, through experimental testing (Xue et al, ; Xue, Chen, & Zhou, ; Chen et al, ; Chen, Xue, Khan, & Li, ), the proposed new strategy's abilities for the detection of deep‐seated deposits were demonstrated. The current geophysical methods usually detect deposits by receiving the anomalous responses caused by contrasts in the physical proprieties (such as the resistivity contrasts used in SOTEM) between the host rock and the ore bodies from the surface.…”

Section: Introductionmentioning

confidence: 99%

“…In this research study, in accordance with the characteristics of the ore-controlling system and the basic geological law of the gold-polymetallic deposits in the Xiaoshan District, as well as the restrictions of topography, geomorphology, vegetation, and so on, a geophysical method and a ground-wire short-offset TEM technique (SOTEM) were adopted. Then, through experimental testing (Xue et al, 2014;Xue, Chen, & Zhou, 2013;Chen et al, 2015;Chen, Xue, Khan, & Li, 2017), the proposed new strategy's abilities for the detection of deep-seated deposits were demonstrated.…”

Section: Introductionmentioning

confidence: 99%

Integrated geological and geophysical investigations for the discovery of deeply buried gold–polymetallic deposits in China

et al. 2019

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Xiaoshan gold–polymetallic concentrated area is located in Henan Province, central China. The area is principally underlain by typical metamorphic core complexes (MCCs), along with essential components of the basins and ranges of western Henan. Mineralization occurs in the regions where the geochemical anomalies of Au and related elements are widely distributed and consist predominantly of mineralized altered rocks and auriferous quartz veins, both of which are hosted within shear zones or fractures of varying sizes and orientations. Several small‐ to medium‐sized gold–polymetallic ore deposits, along with numerous clustered occurrences, have been found in the area in recent years. However, despite the fact that the Xiaoshan District has traditionally been deemed as an excellent geological endowment area with enormous potential for large‐sized deposits, no significant discoveries have been made to date. It is suggested that the main reason responsible for the present exploration situation could be the scarcity of applications of deep‐penetration geophysical prospecting in the area. It is anticipated that integrating geological and geophysical data would be crucial to enhance the successful mineral explorations. In this contribution, a conceptual geological model for the study area was initially reviewed so that the corresponding electromagnetic responses could then be modelled, which would simulate a geophysical type of survey, with appropriate uncertainties added into the analyses. Then, based on such an integrated approach, the required precision of detecting deep‐buried deposits could then be evaluated. In addition, by employing supplementary geophysical data acquired over known deposits, it is possible to gain more instructive insights into the practical geological model. The viabilities of this approach were demonstrated through a case study in which a hidden gold deposit in the studied area was successfully detected. Geophysical surveys were carried out by employing a grounded‐wire short‐offset TEM (SOTEM) technique and revealed two new anomalies (one of which was subsequently tested by drilling). The drilling then confirmed that this anomaly was caused by an ore body 30 m in thickness occurring at about 550 m below surface.

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Section: Iintroductionmentioning

confidence: 99%

“…However, to cover a large area, particularly, the offset of SOTEM measurements conducted in rough and complex mountainous regions may be extended to two times that of the sounding depth. Like other TEM methods, the SOTEM has been recognized as promising TEM version applied in in a variety of hydrogeological investigation, mineral and hydrocarbon exploration [1,3,9,14] .The final task of EM response in time/frequency domain is to study electrical structure by transformation of voltage into apparent resistivity which is most common variable in spite of difference in theoretical concepts of both EM methods. However using Fourier technique we can switch the data from TEM to FEM.…”

mentioning

confidence: 99%

New approach to interpret Short-offset transient electromagnetic (SOTEM) data

Khan¹,

Xue²,

Chen³

et al. 2016

Proceedings of the 7th International Conference on Environment and Engineering Geophysics &Amp; Summit Forum of Chinese Academy

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Abstract-Commonly, TEM data is plotted as apparent resistivity versus time. Later on, with improvement in computer technology, inversion programs have got attention of EM geophysical community. Recently, inversion routines are applied to 1-D problems. In this paper we propose a new approach to interpret SOTEM data by carrying out analysis in time, frequency and pseudo-seismic domain. At first, we processed synthetic data for H & K type models using 1-D Occam inversion. Then we transformed time-domain data into quasi-MT domain and conducted 1-D Bostick's algorithm. Finally, EM diffusion field is transformed into wave field reflecting seismic-like response with some reflection and refraction phenomena. Our proposed approach is validated by a case study of a coal field located in Henan province, China. Keywords-interpretation;SOTEM; transient electromagnetic method I.INTRODUCTIONThe short-offset transient electromagnetic method (SOTEM) is a type of transient electromagnetic sounding method where the offset between transmitter and receiver is approximately set equal to or greater than the target depth. However, to cover a large area, particularly, the offset of SOTEM measurements conducted in rough and complex mountainous regions may be extended to two times that of the sounding depth. Like other TEM methods, the SOTEM has been recognized as promising TEM version applied in in a variety of hydrogeological investigation, mineral and hydrocarbon exploration [1,3,9,14] .The final task of EM response in time/frequency domain is to study electrical structure by transformation of voltage into apparent resistivity which is most common variable in spite of difference in theoretical concepts of both EM methods. However using Fourier technique we can switch the data from TEM to FEM. By comparing resistivity curves of central loop TEM and MT, XUE et al. 2006 proposed a time-frequency (T-F) relationship in range of f = 250 / t~f= 119.2 / t (ms) and an optimal relation of f=210 / t which allow us to apply quais-MT inversion method to transformed SOTEM results. In last, we transformed SOTEM data into pseudo-seismic.II.APPARENT RESISTIVITY Bisection approach based on simple computational routine to solve nonlinear equations has been extensively applied [6] where EM field response must need to be monotonic with resistivity. Therefore, measured voltage is transformed to magnetic field using (1). Where, S is the effective areas of induced coil, 0

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Discovery of a hidden BIF deposit in Anhui province, China by integrated geological and geophysical investigations

Cited by 36 publications

References 8 publications

Exploring weathered and oxidized zones of coal seams using the transient electromagnetic method

Exploring weathered and oxidized zones of coal seams using the transient electromagnetic method

Integrated geological and geophysical investigations for the discovery of deeply buried gold–polymetallic deposits in China

New approach to interpret Short-offset transient electromagnetic (SOTEM) data

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