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3D ERT/IP Imaging for Sulfide Mineralization over Proterozoic metavolcanics in Dhanjori Basin, Eastern Singhbhum, India
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, EAGE-HAGI 1st Asia Pacific Meeting on Near Surface Geoscience and Engineering, Apr 2018, Volume 2018, p.1 - 5
Abstract
Summary
The study area, Paleoproterozoic metavolcanics in Dhanjori Basin, Eastern Singhbhum, India, is the rich source of gold associated with sulfide, quartzite veins and Quartz Pebble Conglomerate. ICP-AES analysis of samples from the study area reported the average concentration of gold, silver, copper, uranium, magnetite, lead and zinc as 5ppm, trace, 110 ppm, 50 ppm, 1.5 ppm, 6.5 ppm and 55 ppm respectively. A regional audiomagnetotellurics (AMT) study in the region indicated the presence of shallow conducting heterogeneities. This study presents the results of 3D Electrical resistivity tomography (ERT)/Induced Polarization (IP) surveys for detection of sulfide mineralization over one of these conductors identified from AMT study. The inverted model shows conducting and moderately chargeable zone as a weathered cover shallow aquifers up to 20 m depth. However, for depths more than 20 m, the lithology is broadly resistive with few conductors of small dimensions surrounding it. These are distinguished on the basis of chargeability variations from low (6mV/V) to high (90 mV/V) indicating distinct geological features such as massive sulfide, QPC/quartz vein with disseminated sulfide gold, greenstone schist, and dolerite dike/Proterozoic gabbro anorthosite mass. The future scout drilling program has been concentrated on the identified zones of sulfide mineralization.
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