Journal of the Geological Society of India

, Volume 82, Issue 6, pp 601–606

Geophysical anomalies associated with uranium mineralization from Beldih mine, South Purulia Shear Zone, India

Authors

  • Animesh Mandal
    • Department of Geology and GeophysicsIndian Institute of Technology Kharagpur
  • Arkoprovo Biswas
    • Department of Geology and GeophysicsIndian Institute of Technology Kharagpur
  • Saurabh Mittal
    • Department of Geology and GeophysicsIndian Institute of Technology Kharagpur
    • Department of Geology and GeophysicsIndian Institute of Technology Kharagpur
  • Shashi Prakash Sharma
    • Department of Geology and GeophysicsIndian Institute of Technology Kharagpur
  • Debashish Sengupta
    • Department of Geology and GeophysicsIndian Institute of Technology Kharagpur
  • Joydip Sen
    • Atomic Minerals Directorate for Exploration and Research
  • A. K. Bhatt
    • Atomic Minerals Directorate for Exploration and Research
Research Article

DOI: 10.1007/s12594-013-0197-1

Cite this article as:
Mandal, A., Biswas, A., Mittal, S. et al. J Geol Soc India (2013) 82: 601. doi:10.1007/s12594-013-0197-1

Abstract

Beldih mine at the central part of the South Purulia Shear Zone (SPSZ) has been reported with low grade uranium-bearing formation within quartz-magnetite-apatite host in kaolinized formation. Therefore, the present integrated geophysical study with gravity, magnetic, radiometric, very low frequency electromagnetic (VLF) and gradient resistivity profiling methods around the known mineralized zones aimed at identifying the exact geophysical signatures and lateral extent of these uranium mineralization bands. The closely spaced gravity-magnetic contours over the low to high anomaly transition zones of Bouguer, reduced-to-pole magnetic, and trend surface separated residual gravity-magnetic anomaly maps indicate the possibility of high altered zone(s) along NW-SE direction at the central part of the study area. High current density plots of VLF method and the low resistive zones in gradient resistivity study depict the coincidence with low gravity, moderately high magnetic and low resistivity anomalies at the same locations. Moderate high radioactive zones have also been observed over these locations. This also suggests the existence of radioactive mineralization over this region. Along profile P2, drilled borehole data revealed the presence of uranium mineralization at a depth of ∼100 m. The vertical projection of this mineralization band also identified as low gravity, low resistivity and high magnetic anomaly zone. Thus, the application of integrated geophysical techniques supported by geological information successfully recognized the nature of geophysical signatures associated with the uranium mineralization of this region. This enhances the scope of further integrated geophysical investigations in the unexplored regions of SPSZ.

Keywords

SPSZIntegrated geophysicsUranium mineralizationBeldih mineWest Bengal

Copyright information

© Geological Society of India 2013