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Reserve estimation of limestone deposit in Obiaja area, Southern Benue Trough, Nigeria using integrated approach

Author Affiliations

  • 1Department of Geological Sciences, Nnamdi Azikiwe University Awka, Nigeria
  • 2Department of Geological Sciences, Nnamdi Azikiwe University Awka, Nigeria
  • 3Department of Geological Sciences, Federal University Gusau, Nigeria

Int. Res. J. Earth Sci., Volume 5, Issue (7), Pages 1-8, August,25 (2017)


A combination of electrical resistivity survey and borehole data has been employed in reserve estimation of limestone within Obiaja area of southern Benue Trough. The area is bounded by Latitudes 427500mE 431500mE and Longitudes 567000mN - 571000mN with an area extent of 0.32km2. Vertical electrical sounding (VES) technique was used to delineate the thickness and depth to the top of the limestone, while geochemical analysis was used to estimate the grade of limestone deposit within the study area. Grid pattern was used within the area of the limestone mineralization for obtaining the data. Interpretation of the VES data was done using conventional manual curve matching and computer iteration techniques using IPI2win program. The result of vertical electrical soundings (VES) was correlated with borehole data within the study area. The result of VES shows four-five geoelectric layers consisting of clays with sands, shale, limestone, shaley sandstone and sandstone. Electrical resistivity of the limestone horizon ranges between 35 and 253 &


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