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Integrated Gravity and Magnetic Approaches for Concealed Chromitite Exploration in Sukinda Valley, Orissa, India.

Kumar KS, Raju PVS.

GEOLOGICAL JOURNAL

https://doi.org/10.1002/gj.70074 

High-resolution gravity and magnetic (G–M) surveys are conducted in the Kathpal region, Sukinda Valley, Odisha, to identify concealed ultramafic rocks hosting chromitite layers. 1D Spectral analysis of G-M data indicated two subsurface layers: serpentinite ± chromite at ~20 m and ultrabasic units at ~70 m. 2D Joint G-M inversion models confirmed chromite mineralisation with layers 4–13 m thick, while 3D G-M inversion delineated mineralised ultramafic rocks up to 30 m thick.

(a) observed lithology from boreholes shows chromite bands; (b) 1D amplitude spectrum of gravity data; (c) 1D amplitude spectrum of magnetic data; (d) 2D interpreted geological model from G-M anomalies; (e) 3D interpreted geological model from residual gravity anomaly; (f) 3D interpreted geological model from residual magnetic anomaly.

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