Two-dimensional Electrical Resistivity Imaging Of Kaolin Deposit At Dajin Gwamna Kankara Local Government Katsina State Nigeria

Two-dimensional Electrical Resistivity Imaging (ERI) technique was applied to delineateKaolin deposit at Dajin Gwamna, Kankara Local Government, Katsina State, Nigeria.Wenner-Schlumberger configuration was utilized for this ERI field survey along sevenprofiles. The data obtained using ABEM Terrameter SAS4000 with electrode selector ES 464were processed using the RES2DINV software. Seven Vertical Electrical Sounding pointswere distributed within the study area. The data were obtained using Ohmega Ω Resistivitymeter and were processed using IPI2Win software. The results of the seven 2-D ElectricalResistivity Imaging profiles in correlation with the Vertical Electrical Sounding results andborehole log data have revealed three distinct layers; these layers range from top layer withresistivity values between 5Ωm to 490Ωm, it is made up of mainly dark brown sandy clay,clay, Kaolin and mottled Kaolin; the thickness varies from the surface to 35m depth in profile1, 34m in profiles 2 and 4, 26m in profile 3, 20m in profiles 5 and 6, and also 30m in profile 7.The result indicates that Kaolin deposit within the study area has range of resistivity valuesbetween 11Ωm to 97Ωm. The study also revealed that, the delineated layers of Kaolin wereextending from east to west and in the north direction, whereby layers of Kaolin were absentin profile 1 which is located in the southern part of the survey area. It was observed that theexploration of Kaolin mineral should be targeted trending east, west and also in the northernpart of the site. The weathered basement rock emerges from the depth of 27.00m to 39.40m inprofile 1, 14.00m to 39.4m in profile 2, 26.00m depth to 39.4m in profile 3, and from thedepth of 34.00m to 39.40m in profiles 4, 5, 6 and 7; consisting of biotite-mica, feldspar andquartz which has resistivity values between 56Ωm to 608Ωm, with fresh basement rock from adepth of 33.80m downwards in profile 1, 35.00m downwards in profiles 4 and 5, and from thedepth of 36.5 downwards in profiles 6 and 7, whereby in profile 2 and 3 fresh basement isabsent. The fresh basement has resistivity values ranging between 200Ωm to above 6000Ωm.

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