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Context 1
... the x-axis is the distance along with the survey profile and on the y-axis is the true depth. Figure 2 shows the location of two lines. ...
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... was carried out from south to north with a length of 500 The EM anomaly has a negative peak centered at station 2,782,900 on the four frequencies (7040 Hz, 1760 Hz, 440 Hz and 110 Hz). The amplitude of the negative peak increases downwardly to give a well-defined two anomalies on frequency 110 Hz (deeper depth of penetration), which may be affected by fault (Figure 2). Meanwhile, the out-of-phase component shows high EM response at the low frequency 110 Hz at this zone. ...
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... reflects a horizontal and vertical change in resistivity. It is noticed that there is a major fault that divides the area into two main parts, which corresponds to field observations (Figure 2), the first from station 0 to station 210 and is distinguished by the existence of a thin crust of valley sediments with low to medium resistivity that continues to a depth of up to 20 meters and the resistivity ranges from 72 Ohm•m to 500 Ohm•m. This is followed by the compact rocks with high resistivity, which ranges from 500 Ohm•m, reaches up to 1900 Ohm•m, and reaches a depth greater than 50 meters. ...
Context 4
... the x-axis is the distance along with the survey profile and on the y-axis is the true depth. Figure 2 shows the location of two lines. ...
Context 5
... was carried out from south to north with a length of 500 The EM anomaly has a negative peak centered at station 2,782,900 on the four frequencies (7040 Hz, 1760 Hz, 440 Hz and 110 Hz). The amplitude of the negative peak increases downwardly to give a well-defined two anomalies on frequency 110 Hz (deeper depth of penetration), which may be affected by fault (Figure 2). Meanwhile, the out-of-phase component shows high EM response at the low frequency 110 Hz at this zone. ...
Context 6
... reflects a horizontal and vertical change in resistivity. It is noticed that there is a major fault that divides the area into two main parts, which corresponds to field observations (Figure 2), the first from station 0 to station 210 and is distinguished by the existence of a thin crust of valley sediments with low to medium resistivity that continues to a depth of up to 20 meters and the resistivity ranges from 72 Ohm•m to 500 Ohm•m. This is followed by the compact rocks with high resistivity, which ranges from 500 Ohm•m, reaches up to 1900 Ohm•m, and reaches a depth greater than 50 meters. ...
Citations
... Such minerals are called pathfinders, which have considerable responses to the electrical (geophysical in general) methods and cause significant electrical anomalies/properties compared with the hosted/surrounded rocks, which make the direct detection of gold, and mineralized, zones using geophysical tools possible (Park et al., 2009;Morgan, 2012;ElGalladi et al., 2022). Therefore, Electrical Resistivity Tomography/Imaging (ERT/ERI) and Induced Polarization (IP) studies are widely used in the lithological discrimination, delineation of subsurface structure and fractures, and A c c e p t e d M a n u s c r i p t exploration of gold and mineralization zones (e.g., Sultan et al., 2009;Park et al., 2009;Fon et al., 2012;ElGalladi et al., 2016;Moreira et al., 2016;Abdullahi et al., 2018;Santos et al., 2018;Heritiana et al., 2019;Salarian et al., 2020;Martínez-Pagán et al., 2020;Mousa et al., 2020;Araffa et al., 2016Araffa et al., , 2020Ombiro et al., 2021;El-Sadek et al., 2021;Mekkawi et al., 2021). In the present study, ERT and IP data were analyzed to evaluate the continuity of mineralized gold-bearing quartz veins beneath Wadi Haimur in the vicinity of Gabel Haimur mine. ...
Although the continuity of gold mining work since Pharaonic times till today, Wadi Haimur is still promised source for gold. Wadi Haimur is located in west Allaqi-Heinai-Suture (AHS), south Eastern Desert of Egypt. Gold mineralization is mainly confined within quartz-carbonate and sulfide-bearing quartz veins within sheared, altered rocks, while listvenitization plays a significant role in gold concentration along Haimur area. Therefore, critical analyses of remote sensing data were applied to map alteration zones and delineate listvenites. Spatially-enhanced images were processed to trace lineaments and weakness zones which may represent pathways of mineralized, ascended hydrothermal fluids. Ground geophysical, magnetic, and geoelectric surveys were performed to study the depth-extension of mineralized bodies in the vicinity of the historical mines within Wadi Haimur. Interpretation of land-magnetic data indicates the presence of mineralized veins associated with narrow shear zones. Derivatives and high-pass filters were utilized to map shallow mineralized sources and deduce their trends. Upward continuation and low-pass filters were used to detect the deep sources. Depths to magnetic bodies were estimated using Power-Spectrum, Euler, and inversion of single anomalies. Geochemical sampling was performed to test the results. According to the remarkable variation in resistivity and chargeability values of resistivity and induced-polarization tomography profiles, the subsurface lithology was classified and probable mineralized zones within the subsurface were detected. Encouraging results from regolith, trenching, rock-chip sampling, and Reverse-Circulation (RC) drilling indicated the extension of auriferous anomalies within the bedrock. Good correlation of RC-holes auriferous anomalies depths and deduced depths from magnetic interpretation was revealed.
