Abstract
The Gani-Kalva fault (GKF), located in the western part of the Cuddapah basin, India, is well known for hosting mineral deposits of iron, copper, and gold. In the present study, we undertook a comprehensive exploration approach, combining semi-detailed gravity and remote sensing surveys followed by detailed geophysical surveys comprising self-potential, electrical resistivity, and induced polarization to map the potential gold mineralization zones within the GKF. The integration of the linear pattern of gravity anomaly and its derivative with satellite imagery and airborne electromagnetic anomalies suggests that the Gani block between extensional bends and fault splays might be favourable for subsurface mineralization. The inverted resistivity and induced polarization depth sections across these anomalous zones highlighted the presence of the low resistivity and moderate chargeability bodies, typically at a depth range of 30–50 m. Subsequent borehole drilling was conducted at these promising locations, confirming the presence of auriferous sulphide mineralization within quartz veins and veinlets. However, elemental analysis of core samples from this borehole reveals only 2.5 ppm of gold. Although these results may not be very encouraging in the context of current exploration standards, the study clearly emphasized the pivotal role of geophysical techniques in the optimization of the survey area for targeting high mineralization potential zones.
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The authors are thankful to the Additional Director General, HOD, GSI, SR, for his encouragement and permission to publish this work and for permitting them to carry out the work. All the authors are thankful to the Chief Editor and two anonymous reviewers for careful handling of our manuscript. This work is a part of the Ph.D. thesis work of the first author DVK. We are thankful to the internal reviewer, GSI, NER, Shillong for his valuable review and suggestions.
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Vijayakumar, D., Babu, M.M., Rao, G.S. et al. Optimization of Survey Area for Auriferous-Sulphide Mineralization Using Integrated Geophysical Study: A Case Study from Gani-Kalva Fault Zone, Cuddapah Basin, India. Pure Appl. Geophys. 180, 3901–3917 (2023). https://doi.org/10.1007/s00024-023-03354-3
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DOI: https://doi.org/10.1007/s00024-023-03354-3