Synthesis of geological and airborne geophysical data for prognosticating new area for the exploration of lead and zinc in Sindesar Khurd area, Rajpura-Dariba belt, Rajsamand district, Rajasthan

摘要

In the Rajpura-Dariba belt zinc and lead mineralization was established on the basis of gossan and opinions were given that the deposits are stratiform and syngenetic. During last two decades metamorphism and volcanic processes have been attributed for the generation of exhalative and remobilized lead-zinc ore bodies. Subsequent exploration was based on the concept of successive borehole planning around positive intersections. Areas having surface indications of base metal mineralization and their extensions have been already explored. Recent deep drilling by Hindustan Zinc Limited (HZL) in this area has intersected rich ore lodes, thereby confirming depth ward continuity of ore zones at some places. It indicates possibility of searching hidden deposits by innovative techniques. Therefore, today, there is a challenge before geoscientists to discover new deposits in this area by an exploration technique which should have low risk, consume less time and it should be cost effective. In view of the above objective for Rajpura-Dariba belt, an integrated method of exploration has been discussed. The exploration strategy is based on synthesis of all the available data and its reinterpretation to prognosticate favourable sites of exploration and also to suggest new scheme of exploration. Based on previous data and present studies structural and lithological controls of base metal mineralization have been recorded and guides for searching new areas and exploration strategy has been suggested. Based on these data six new areas have been identified for future exploration. The data includes lithological configuration, structural setup and controls of lead-zinc mineralization collected from previous data and present studies. It is suggested that for further exploration in these six areas ground magnetic survey should be carried out to understand magnetic lows and highs to decipher structural discontinuity and faults which could be favourable sites of mineralization. Combination of SP, IP, EM and gravity shall help in distinguishing between base metals from graphite mica schist.