Delineating Mineralisation Zones within the Keffi-Abuja Area Using Aeromagnetic Data

Abstract

Delineating mineralisation zones within Keffi- Abuja North Central, Nigeria was carried out to identify structures and to suggest the viability of the basin for Mineralization Zone potentials in the survey area. Aeromagnetic data over the study area bounded by latitudes N8o50’N to 10o00’N and longitudes 7o00’E to 8o00’E was carried out using First Vertical Derivative, Horizontal Derivative, Second Vertical Derivative and Analytical Signal. The First Vertical Derivative, map shows a dominant NE trend of the structures within the study area, The Horizontal Derivative reveals those anomalies that are trending in the horizontal (x-direction) clearly, Second Vertical Derivative map identify regions around central to west part of the study area which correspond to Kagarko, Kafin and Abuja to be areas with high mineralization zone, smaller mineralisation zones are also identified to NW region around Bishini, SW within Kwali and Keffi in SE region. Analytical signal identify areas with high amplitude ranges from -0.010m to 0.141m within the study area. The high amplitude structures are to the central and western portion around the Kagarko, Kafin and Abuja axis. This made it possible to delineate the various mineralisation zones around the study area. Map shows that central to western portions around the Kagarko, Kafin and Abuja are particularly promising for mineralization.