scholarly journals Contribution of ERT on the Study of Ag-Pb-Zn, Fluorite, and Barite Deposits in Northeast Mexico

Minerals ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 249
Author(s):  
José Alberto Batista-Rodríguez ◽  
Marco Antonio Pérez-Flores
Keyword(s):  
Structural Control ◽  
Electrical Resistivity Tomography ◽  
Electric Resistivity ◽  
Mineral Deposits ◽  
Mississippi Valley ◽  
Mining Activities ◽  
Resistivity Tomography ◽  
Made In ◽  
Wenner Array ◽  
Lower Resistivity

The results on the effectiveness of five 2D electrical resistivity tomography (ERT) survey profiles for Ag-Pb-Zn, fluorite, and barite exploration Mississippi Valley Type (MVT) and on the magmatic deposits of northeast Mexico, are presented. The profiles were made in areas with mining activities or mineralization outcrops. Schlumberger, dipole-dipole, and Wenner array configurations were used on the measurements. The results showed that electric resistivity can be used to distinguish between mineralized zones. In magmatic-type Pb-Zn and MVT Pb-Zn deposits, resistivity values are shown as low. In magmatic-type fluorite and MVT fluorite deposits, as well as the MVT barite deposit, low-resistivity values are related to Fe sulfides and clays. With these results it is possible to connect observed surface mineralization with underground mineralization. New mineralized zones are also found and their geometries, extensions, and dipping are reported. Therefore, lower resistivity values can be linked to mineral bodies with higher Ag-Pb-Zn contents, as well as bodies enriched in Fe sulfides, Fe oxides, and clays in the fluorite and barite mineralizations. In most ERT models, fractures and faults are identified, indicating a structural control on mineralization. From the geoelectric patterns we can infer the magmatic and MVT origin of these mineral deposits.

scholarly journals Application of electric resistivity tomography for investigation of geological situation closed to railways

2019 ◽  
Vol 265 ◽  
pp. 03005
Author(s):  
Dmitriy Gorbach ◽  
Valeriya Yakimenko ◽  
Olga Konovalova
Keyword(s):  
Electrical Resistivity ◽  
Electrical Resistivity Tomography ◽  
Electric Resistivity ◽  
Practical Work ◽  
Surface Zone ◽  
Two Dimensional ◽  
Resistivity Tomography ◽  
Near Surface ◽  
Geological Situation ◽  
Engineering Geophysics

The paper reviews methods of engineering geophysics which can be applied to sections of railway tracks. The method of electrical resistivity tomography is used to study the properties of the geological situation under an engineering structure. In the course of practical work, two-dimensional geoelectric sections were obtained. Interpretation of the sections allowed to understand the structure of the near-surface zone.

scholarly journals Laboratory Studies Using Electrical Resistivity Tomography and Fiber Optic Techniques to Detect Seepage Zones in River Embankments

Geosciences ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 69
Author(s):  
Azadeh Hojat ◽  
Maddalena Ferrario ◽  
Diego Arosio ◽  
Marco Brunero ◽  
Vladislav Ivov Ivanov ◽  
...  
Keyword(s):  
Electrical Resistivity ◽  
Electrical Resistivity Tomography ◽  
Fiber Optic ◽  
Time Lapse ◽  
Electrode Spacing ◽  
Short Delay ◽  
Resistivity Tomography ◽  
Temperature Changes ◽  
Pros And Cons ◽  
Wenner Array

We present the results of laboratory experiments on a down-scaled river levee constructed with clayey material collected from a river embankment where a permanent resistivity instrument has operated since 2015. To create potential seepages through the levee, two zones (5 × 4 cm and 10 × 2 cm) were filled with sand during the levee construction. Electrical resistivity tomography (ERT) technique and Fiber Bragg Grating (FBG) technology were used to study time-lapse variations due to seepage. The ERT profile was spread on the levee crest and the Wenner array with unit electrode spacing a = 3 cm was used. Six organic modified ceramics (ORMOCER) coated 250 μm-diameter fibers were deployed in different parts of the levee. Time-lapse measurements were performed for both techniques from the beginning of each experiment when water was added to the river side until the water was continuously exiting from the seepage zones. The results showed that ERT images could detect seepages from the early stages. Although with a short delay compared to ERT, fiber optic sensors also showed their ability to detect water infiltrations by measuring temperature changes. Both technologies being successful, a discussion about respective peculiarities and pros and cons is proposed to suggest some criteria in choosing the proper technique according to the specific needs.

scholarly journals Solution of Collinearity Problem in Two-Dimensional Electrical Resistivity Tomography using Wenner Array

2021 ◽  
Vol 29 (2) ◽  
Author(s):  
Mustapha Adejo Mohammed ◽  
Nordiana Mohd Muztaza ◽  
Rosli Saad
Keyword(s):  
Electrical Resistivity ◽  
Electrical Resistivity Tomography ◽  
Two Dimensional ◽  
Electrode Arrays ◽  
Resistivity Tomography ◽  
Underlying Assumption ◽  
New Approach ◽  
Surface Constraint ◽  
True Model ◽  
Wenner Array

Two-dimensional electrical resistivity tomography (2-D ERT) is one of the most common geophysical tools employed to satisfy the ever-growing need for obtaining subsurface information. Most of the conventional electrode arrays used for 2-D ERT survey are built with the theoretical assumption that the survey lines are straight to guarantee four collinear electrodes at every point of measurement. However, due to surface constraint associated with most survey areas, it is rarely possible to conduct a two-dimensional resistivity survey on a straight line. Therefore, 2-D ERT survey conducted on a surface constraint field requires shifting one or more electrodes off the survey line, which contrasts with the underlying assumption. Consequently, the result might be prone to false anomalies. Thus, this study aimed to device a new approach that could mitigate the false anomalies posed by non-collinearity of electrodes in 2-D ERT result. In view of this, ABEM Terrameter SAS4000 using Wenner array configuration was adopted for the survey. The data was acquired with all electrodes inline and one or more electrodes offline at stepwise distances, respectively. Based on the result obtained, the new approach mitigates the offline electrodes effect, as the inverse resistivity tomograms resolves the geometries of the true model reasonably well. More so, it has high R-value >90% which is an indication of proximity to the true model. Hence, it is concluded that the new approach is effective in mitigating offline electrode effect on a 2-D ERT result.

Water Detection within the Working Face of an Underground Coal Mine Using 3D Electric Resistivity Tomography (ERT)

2019 ◽  
Vol 24 (3) ◽  
pp. 497-505 ◽  
Author(s):  
Weifu Gao ◽  
Longqing Shi ◽  
Peihe Zhai
Keyword(s):  
Electrical Resistivity Tomography ◽  
Electric Resistivity ◽  
Resistivity Tomography ◽  
Underground Coal Mine ◽  
Water Detection ◽  
Excess Water ◽  
Working Face ◽  
Underground Coal Mines ◽  
Safety Consideration ◽  
The Face

Controlling water in underground coal mines is an important safety consideration. There are very few methods that can detect or map water remotely within the working face of a mine. The two-dimensional (2D) electrical resistivity tomography (ERT) method is sufficient for detecting water directly above the roof and below the floor, but it fails to detect water within the internal blocks of the working face. Therefore, it is critical to develop a new acquisition methodology for mapping internally within the face given the limited space in which to work. In this paper, we apply the pole-pole array in an L-array around the working face using a modified roll-along method. The data are then inverted using commercial software. With our new methodology, abnormal areas that likely indicate excess water are delineated to provide guidance for the control of mine water.

Ecuador referendum result complicates mining outlook

2018 ◽  
Keyword(s):  
Mineral Deposits ◽  
Local Elections ◽  
Mining Activities ◽  
Mining Sector ◽  
Content Type ◽  
National Assembly ◽  
Mining Companies ◽  
Southern Highland ◽  
Made In ◽  
Large Deposits

Subject Mining outlook. Significance On March 16, Ecuador’s National Assembly overturned a law that provided tax breaks for mining companies. The move was made in accordance with the results of February’s national referendum, which look set to complicate the prospects of Ecuador’s mining sector. The seven-question plebiscite, which President Lenin Moreno launched to demonstrate popular support for his political and economic programme, included two mining-related questions -- one on overturning the tax-break law and one seeking to place stricter limits on mining activities. Both were backed enthusiastically by the electorate. Impacts Rising world metal prices will increase the desire of mining firms to exploit Ecuador’s largely untapped mineral deposits. Mining will be a key issue in 2019 local elections, especially in southern highland provinces where large deposits are located. Mining concessions will face greater scrutiny as environmental organisations seek to ensure they do not contravene the constitution.

SIMULATION OF ELECTRICAL MONITORING OF DAMS WITH LEAKAGE WITH A TRANSVERSE PLACEMENT OF THE MEASURING INSTALLATION

2020 ◽  
Vol 8 (4) ◽  
pp. 69-82
Author(s):  
D.S. Rakisheva ◽  
◽  
B.G. Mukanova ◽  
I.N. Modin ◽  
◽  
...  
Keyword(s):  
Numerical Modeling ◽  
Water Level ◽  
Electrical Resistivity Tomography ◽  
Resistivity Tomography ◽  
Measuring Installation ◽  
Basic Functions ◽  
Tomography Method ◽  
Dam Monitoring ◽  
The Mathematical Model ◽  
Measurement Line

Numerical modeling of the problem of dam monitoring by the Electrical Resistivity Tomography method is carried out. The mathematical model is based on integral equations with a partial Fourier transform with respect to one spatial variable. It is assumed that the measurement line is located across the dam longitude. To approximate the shape of the dam surface, the Radial Basic Functions method is applied. The influence of locations of the water-dam, dam-basement, basement-leakage boundaries with respect to the sounding installation, which is partially placed under the headwater, is studied. Numerical modeling is carried out for the following varied parameters: 1) water level at the headwater; 2) the height of the leak; 3) the depth of the leak; 4) position of the supply electrode; 5) water level and leaks positions are changing simultaneously. Modeling results are presented in the form of apparent resistivity curves, as it is customary in geophysical practice.

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