Imaging Regional Geology and Au – Sulphide mineralization over Dhanjori greenstone belt: Implications from 3-D Inversion of Audio Magnetotelluric data and Petrophysical Characterization

Singh, Roshan Kumar; Maurya, Ved P.; Shalivahan, _; Singh, Sahendra

doi:10.1016/j.oregeorev.2019.01.027

Cited by 11 publications

(7 citation statements)

References 76 publications

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“…The apparent chargeability (mV/V or ms) is then calculated in order to determine the polarization characteristics of the ground through analysis of the attenuating voltage over a specified time interval (Chouteau, 2006; Geotomo, 2018; Marescot, 2008; Sumner, 2012). IP and ERT are commonly used in geological and mining prospecting to indicate the presence of metal sulphides, metal oxides, clays and other old buried mine sites in the ground (Bharti et al., 2016; Bharti et al., 2019; Claude et al., 2014; Das et al., 2017; Gündoğdu et al., 2022; Horo et al., 2020; Kayode et al., 2022; Moreira et al., 2019; Shirazi et al., 2022; Silva et al., 2022; Singh et al., 2019; Zaid et al., 2022). Other studies use these methods for the 3D modelling of geoelectric anomalies corresponding to the targets sought (Embeng et al., 2022; Kayode et al., 2022; Lenhare & Moreira, 2020; Martin et al., 2020; Moreira et al., 2019; Sağır et al., 2020; Ya‐wei et al., 2015).…”

Section: Data Acquisition Used and Processing Methodologymentioning

confidence: 99%

“…In geological or mining prospecting, the use of a geophysical approach leads to the elaboration of subsurface imagery that should allow a better understanding of the spatial distribution of geophysical anomalies related to the sought geological formations (Blanchy et al., 2020; Claude et al., 2014; Gouet et al., 2015; Hasan et al., 2021; Moreira et al., 2019; Zaid et al., 2022). In the ERT and IP surveys, the resistivity and chargeability of the geological formations are studied in order to identify zones of low (or medium) resistivity and high chargeability that may represent potential zones of gold mineralization (Embeng et al., 2022; Gouet et al., 2013; Horo et al., 2020; Kayode et al., 2022; Lenhare & Moreira, 2020; Singh et al., 2019; Yan et al., 2018). The present study combines these two geophysical techniques (ERT and IP) in 3D modelling and preliminary estimation of the volume of geoelectrical anomalies that may correspond to potential primary gold mineralization targets in the Simi locality.…”

Section: Introductionmentioning

confidence: 99%

“…This situation is common to all the mining villages of the Lom series, and the Cameroonian government is struggling to find appropriate solutions to attract investors and make the mineralization of this series profitable in strict compliance with environmental standards. Geophysical tools, such as induced polarization (IP) and electrical resistivity tomography (ERT), are important techniques often used in mining projects, particularly for the exploration of metal sulphides such as gold (Bharti et al., 2016; Bharti et al., 2019; Claude et al., 2014; Das et al., 2017; Gouet et al., 2015; Hasan et al., 2021; Horo et al., 2020; Moreira et al., 2019; Singh et al., 2019; Zaid et al., 2022). These tools facilitate the highlighting of favourable mineralization zones in a complex geological and geomorphological environment.…”

Section: Introductionmentioning

confidence: 99%

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Combined analysis of resistivity and induced polarization tomography for 3D modelling and preliminary volume estimation of the possible gold mineralization zones in the Simi locality, Adamawa, Cameroon

Moustapha

Yem

Meying

et al. 2023

Geophysical Prospecting

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The present study attempts to combine direct current and induced polarization methods for 3D geological modelling and preliminary volume estimation of gold mineralization targets in the Simi locality, Adamawa, Cameroon. To begin, resistivity and chargeability data were collected along seven profiles oriented in N150E using the electrical tomography technique. A geological investigation was also carried out and allowed in addition to the geological formations to highlight the existence of gold mineralization in the study area. The interpretation of the inversion results was done by taking into consideration the geological field data and the existing resistivity charts. The 3D distribution of the interpreted sections allowed us to make a horizontal correlation between the different sections and to elaborate the 3D geological model of the study area by using the deterministic inverse distance method. The estimated model indicates a volume of 621,130.625 m 3 of the possible gold complex. The gold complex was then divided into two mineralization domains based on chargeability ranges (mV/V): A first domain is associated with a major mineralization zone (39-60 mV/V) with a volume of 10,842 m 3 , and a second domain is associated with secondary mineralization zone (18-39 mV/V) with a volume of 610,288 m 3 . This model allows to compartmentalize the gold complex and can be used as a base model for the gold investigation in the study area.

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Section: Data Acquisition Used and Processing Methodologymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Combined analysis of resistivity and induced polarization tomography for 3D modelling and preliminary volume estimation of the possible gold mineralization zones in the Simi locality, Adamawa, Cameroon

Moustapha

Yem

Meying

et al. 2023

Geophysical Prospecting

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“…Audio magnetotelluric sounding is an important geophysical method that uses natural electromagnetic fields as the field source to study the electrical structure of the earth's interior [45,46]. The earth is seen as the horizontal medium and the magnetotelluric field is vertically projected into the ground in the form of plane electromagnetic waves.…”

Section: Experimental 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

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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.

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“…We determined the depth of exploration by comparing the new RMS values with the one of our final models, as we expect a worsened data fit once the conductive layer deteriorates the model response in the available period range (Singh et al, 2019). As a result, we can conclude that the model is sensitive to the conductive layer down to a depth of 5.25-6.21 km where the RMS worsens in comparison to the RMS obtained for the preferred 3D inversion model.…”

Section: Regional Studymentioning

confidence: 99%

Magnetotelluric images of the medium enthalpy Bakreswar geothermal province within a granitic gneissic complex, Eastern Indian Peninsula

Singh,

Weckmann,

Srivastava

2023

Geophysical Prospecting

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The Bakreswar Geothermal Province (BGP) represents a medium enthalpy geothermal system with its Bakreswar (BHS) and Tantloie (THS) hot springs. It lies within the Chotanagpur Granite Gneissic Complex (CGGC) in the eastern part of the Indian Peninsula. The province has a high heat flow and a high geothermal gradient of 90°C/km. Magnetotelluric (MT) data from ninety‐five sites in a frequency range of 10 kHz‐10 Hz were acquired over the BGP to obtain an electrical conductivity model and map the geothermal reservoir with its fluid pathways and related geological structures. Subsurface conductivity models obtained from 3D inversions of the MT data exhibit several prominent anomalies, which are supplemented by gravity results. The conductivity model maps three features which act as a conduit (a) a northwest‐southeast trending feature, (b) an east‐west trending feature to the south of the northwest‐southeast trending feature (which lies 1 km north of the ONGC fault marked by previous studies), and (c) shallow conducting features close to BHS. The northwest‐southeast trending feature coincides with the boundary of the high‐density intrusive block. This NW‐SE trending feature provides the pathway for the meteoric water to reach a maximum depth of 2.7 km, where it gets heated by interacting with deep‐seated structures and then it rises towards the surface. The radiogenic process occurring within the granites of CGGC provides the heat responsible for heating the meteoric water. The NW‐SE and EW trending features are responsible for the transport of meteoric water to deeper depths and then towards the shallow regions of the Earth. The near surface features close to the BHS are responsible for carrying the water further towards the hotspring. The resistivity of these structures plotted as a function of salinity and temperatures for saline crustal fluids suggests the involvement of meteoric water. Further, applying Archie's law to this resistivity suggests that the conduit path has a porosity greater than 10%. This study successfully maps the anomalous structures which might foster the migration of geothermal fluid in BGP.This article is protected by copyright. All rights reserved

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Imaging Regional Geology and Au – Sulphide mineralization over Dhanjori greenstone belt: Implications from 3-D Inversion of Audio Magnetotelluric data and Petrophysical Characterization

Cited by 11 publications

References 76 publications

Combined analysis of resistivity and induced polarization tomography for 3D modelling and preliminary volume estimation of the possible gold mineralization zones in the Simi locality, Adamawa, Cameroon

Combined analysis of resistivity and induced polarization tomography for 3D modelling and preliminary volume estimation of the possible gold mineralization zones in the Simi locality, Adamawa, Cameroon

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

Magnetotelluric images of the medium enthalpy Bakreswar geothermal province within a granitic gneissic complex, Eastern Indian Peninsula

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