Section 20
Chapter 19,072

Geophysics in gold exploration; an appraisal from South Indian gold prospects

Vittal Rao, K.P.R.; Rao, T.M.hana

Special Publication Series - Geological Survey of India 49: 79-94


Accession: 019071183

Some of the typical geophysical responses corresponding to the mineralisation intersected in the boreholes drilled for gold are presented. The profiles are selected from Hutti-Maski, Ramagiri-Penakacherla-Hagari, Shimoga, Kolar and Nuggihalli greenstone belts. Most of the boreholes were drilled based on geological considerations. However, the fair degree of correlation noticed between the geophysical anomalies and the mineralised zones demonstrates the efficacy of geophysical techniques in picking up sulphide lode zones, alteration halos, pathfinder minerals, etc., which are ultimately related to gold mineralisation in these areas. This appraisal also demonstrates that geophysical maps will be of immense help in planning the drilling programme in such a way that the information derived can be used for the assessment of the prospect objectively. Some of the geophysical anomaly maps along with borehole locations presented in this review hints at this aspect of exploration.

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