2D and 3D ELECTRICAL RESISTIVITY TOMOGRAPHY (ERT) INVESTIGATION OF MINERAL DEPOSITS IN AMAHOR, EDO STATE, NIGERIA

Authors: *Alile O.M, Aigbogun C.O, Enoma N, Abraham E.M, Ighodalo J.E

DOI Info: N/A

ABSTRACT

A three – dimensional (3D) geoelectrical resistivity imaging study was carried out on different locations (Eguare primary school field and Amahor Secondary School Field) in Amahor, Edo State, Nigeria for solid mineral investigations. A series of 2D apparent resistivity data were generated in parallel and perpendicular directions using dipole-dipole electrode configuration with electrode separations of 2.5 m and 5 m respectively. The 2D data sets were collated and inverted separately to produce 2D models for each line. These models were then collated into 3D data sets and inverted using 3D inversion codes with smoothness constrain inversion. The images were presented as horizontal depth slices of a block model of both locations in the parallel and orthogonal directions. The total depth attained for the first and second locations were 7.66 m and 15.3 m respectively. Results obtained also showed that the two locations considered were composed of lateritic soil, sand, sandstone, shale, limestone, clay, dolomite with resistivity ranging from 259 ?m to 2159 ?m for both units electrode spacing. Results from this study would be useful in furthering mineral exploration in the region.

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