Journal of Geological Society of India (Online archive from Vol 1 to Vol 78)

L. N. Singh ¹, S. Banglani ¹, D. Gupta ¹

Affiliations
1 Geological Survey of India, Western Region, Jaipur – 302 004, IN

Abstract

During the course of exploratory drilling in mineralised belts of Rajasthan, mise-a-la-masse has been carried out as a routine measure to delineate the subsurface disposition of ore body in X-Y direction. This, a post discovery geophysical method was tried and found to be very effective in tracing the extension of polymetallic sulphide and their interconnectivity in the boreholes.

In Biranthiya area, mise-a-la-masse was conducted and a borehole suggested on the basis of equipotential map intersected richer mineralization. In Kalabar, Biranthiya and Delwara area, the survey has also reflected plunge of the ore body. Equipotential maps of all the areas show the compaction of contours in up-dip side, which clearly indicates the dip of the mineralized body. The anomaly axis of mise-a-la-masse is well corroborated with the axis of Self-Potential in Kalabar and Biranthiya areas, Pali District, Rajasthan. This paper reveals the success of mise-a-lamasse technique applied to some mineral prospects of Rajasthan in deciphering the subsurface disposition, dip and attitude of the ore body.

Keywords

Mise-a-la-Masse, Subsurface Disposition, Exploration, Mineralisation, Rajasthan.

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L. N. Singh ¹, D. Gupta ², Ram Gopal ², Radhe Shyam ², S. K. Singh ¹, S. L. Singh ², A. K. Agrawal ³

Affiliations
1 Geological Survey of India, Northern Region, Lucknow - 226 024, IN
2 Geological Survey of India, Western Region, Jaipur - 302 004, IN
3 Geological Survey of India, A M S E Wing, Bangalore - 560 078, IN

Abstract

A small deposit of lead and zinc was established in southern part of Sawar metasedimentary belt during third phase of drilling. The Mise-A-La-Masse survey, a post discovery geophysical method carried out in the boreholes of this belt has yielded significant results. This method has been useful in delineating the subsurface disposition of mineralised zones and their lateral extension. This technique is also successful in the area in establishing correlation between different parts of an ore body with varying sulphide percentage, which are located distantly but are in electrical continuity. Hence the Mise-La-Masse method has been of immense help in planning the boreholes thereby optimizing drilling cost in the Sawar Belt. The composite map of equipotential line and chargeability contour has indicated that the contour pattern and disposition of anomaly axes are similar in both the cases.

Keywords

Mise-A-La-Masse Survey, Pb-Zn Mineralised Zone, Composite Map, Sawar Metasedimentary Belt, Ajmer District, Rajasthan.

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