Adeyinka Olasehinde

A feasibility study was conducted at Ratcon Quarry, Limited, located at Sokuro Village, 15km away from Ibadan, Nigeria, along the LagosIbadan expressway, with an area of 150 acres. The area is covered by the southwestern basement complex. The rocks are pinkish granite gneiss and gray granite gneiss. Evaluation shows a tonnage of 75Mt; annual average production of 0.65Mt; economic life span of 115 years. The value and viability of quarry business is lucrative in a third world country like Nigeria, where there is available market for consumption in civil engineering works; with an initial investment cost of US$18 million, total cash out flow of US $5.55 million, total cash inflow of US $9.85 million, annual net profit of US $ 3.91 million, the payback period of six (6) years.

The present work presents integrated data-driven approach using geochemistry, aeromagnetic data, airborne radiometric data and Landsat ETM Imagery in the study. The study is aimed at producing mineral potential exploration model of the study area, which would serve as a model for other Younger Granite Complexes in the Province with unknown mineralization. The various exploratory dataset involve creating spatial database of the geology, geochemical data, the aeromagnetic (total field magnetic intensity), airborne radiometric (K, Th, U count), and Remote Sensing (Landsat ETM imagery). Principal Component Analysis (PCA) of fortytwo exploratory variables was employed in organizing and producing the mineral potential zones. The first three components of the Principal Component Analysis, account for over 50% of the total variability. The high, moderate to low moderate loading on the components represents background population of the study area and also reflects the combined effect of the ...

This research examined the levels of heavy metals in boreholes and hand dug wells within Kashere town and environs. The sampling was carried out at 10 locations in Kashere area of Gombe state. Five samples were collected from boreholes and five from hand dug wells and analyzed for some heavy metals (copper, cadmium, chromium, lead, nickel and manganese) using Atomic Absorption Spectrophotometer (AAS). The result shows that there is high concentration of most of the heavy metals in the groundwater samples with Pb, Ni, Cr, and Cd having mean concentrations above the maximum limit set by W.H.O. It was recommended that a systematic treatment of heavy metals concentration in groundwater sources in the study area be carried out regularly either through; Chemical precipitation, ion exchange or Reverse osmosis.

A geophysical investigation involving Shlumberger vertical electrical sounding (VES) profiling was conducted on a failed dam in Cham area, Upper Benue Trough, North eastern Nigeria. The raw VES data were used to prepare apparent resistivity curve, pseudosection and the geoelectric section along considered six VES points. The study indicates the subsurface as remarkably in-homogeneous in geologic composition. The geologic layers are defined by variable combination of siltstone, shally-clay, claystone, shale and clay which constitute the subsurface. The investigation indicated displacement at depth which correlates well with the failed segment of the dam. It is concluded from the study that the dam under investigation probably failed on account of displacement along suspected weak zones. Keywords: Geophysical,Shlumberger VES, Dam, Displacement

This research aimed at investigating the concentration of arsenic (As) due to their potential environmental impact and contamination, in the rocks (Coarse Porphyritic Granite, Biotite Granite, Bima Sandstone and basalt) of the Kaltungo area which is part of the Upper Benue Trough. Eight (8) fresh samples (two from each lithologic unit) were collected and analysed using Inductively Coupled Plasma Optical Emission Spectrometer (ICPOES) for arsenic (As). The results were presented using graphical presentations and this revealed that rocks in the study area host high concentration of arsenic (As) (87.54-237.65 ppm) compared with the average crustal abundance of 2ppm. These values can be attributed to high concentration of the element in the initial magma and/or hydrothermal and weathering processes which acted on the rocks. The high concentration of arsenic (As) in the rocks of Kaltungo area calls for further studies on its distribution and concentration in the soils, stream sediments a...

Pseudogravity transformation of the aeromagnetic data over the Riruwai Complex reveals three geological vent structures: southern, north-western and northern vents in the complex which incredibly compares to the geological information. They consist of mainly agglomerates, breccias, tuffs and rhyolites. These perhaps represent intraplate tectonic and magmatic phenomena linked to deep mantle plumes and asthenospheric upwellings. Bottom depth of about 5.4km is estimated using statistical space domain variogram, the dimensions of the vents are also reported.

Thirty soil samples from Rayfield, Bukuru and environs on the Jos Plateau were analysed for lead (Pb), Zirconium (Zr) and Iron(Fe) using the X-ray fluorescence (XRF) analytical method, with the aim of determining the extent to which the long history of mining, and other suficial processes have affected the soils of the study area. The distribution of the analysed elements (Pb, Zr, Fe) were evaluated to monitor potential threats to human health and the natural ecosystem by comparing the determined concentrations of these elements (Pb, Zr, Fe) with concentrations in uncultivated and unmined areas as controls.Mean concen- trations of 223.67ppm was obtained for Pb; 425.53ppm for Zr and 56208.7ppm for Fe as against 17ppm, 270ppm and 21000ppm for Pb, Zr, and Fe respectively inunmined and uncultivated soils.A calculation of anthropogenic factor (AF) and Index of geo-accumulation (Igeo) indicated Pb, Zr and Fe contaminations (Pb moderate to high, Zr and Fe low to moderate contamina- tions) ...