![]() This intrusion is classified as QMD and GMD according to the ratio of mafic rocks. We applied 3D ERT to explore the Yeoncheon TM deposit in the Gonamsan igneous intrusion. After all electrodes were installed, their locations were measured by high-precision GPS, and this information was used for inversion by modifying the node position to the measured electrode position. For 3D analysis, the distance between survey lines is not appropriate compared to the electrode interval, but it is supplemented using the data with 40 and 60 m of dipole spacing. The distance between survey lines was 120 m. In general, the measured potential and depth of interpretation increased with dipole spacing, but the spatial resolution decreased. Furthermore, to enhance the data quality and depth of interpretation, we measured electrical potential by changing the dipole spacing to 20, 40, and 60 m. The low signal-to-noise ratio, a problem with this array, does not have a significant impact on data quality due to the high resistivity of near-surface in this area. We chose this array because of its high resolution and the ease of deployment in the field. The dipole-dipole electrode array was used for data acquisition. The survey lines had a length of about 680 m and included 35 electrodes, which were spaced at 20 m intervals. The inversion results of ERT can help in selecting the location of geophysical survey or drilling. The selected region for gabbro monzodiorite extends to the northeast direction, which is consistent with the geology map, magnetic anomaly, and drilling data. The resistivity criterion distinguishing the lithologies of gabbro and quartz monzodiorite was determined from laboratory resistivity experimental results performed on drilling cores. ![]() Because ore minerals are mainly distributed in gabbro monzodiorite rather than quartz monzodiorite, we applied three-dimensional inversion of electrical resistivity tomography (ERT) data to identify lithology boundaries related to magma differentiation. ![]() An electrical resistivity survey was carried out in the potential area to image subsurface structure. Our team conducted an airborne magnetic survey for multiscale mineral exploration and then selected a promising survey area. The Yeoncheon titanomagnetite deposit formed by Precambrian magma differentiation is located in Gyeonggi-do, South Korea. ![]()
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