Purpose. To evaluate some ceramic properties of Gadabiu clay deposit, Kwali Area Council, Abuja Nigeria.Methods. Soil samples from the study area were subjected to various physical and mechanical tests such as; X-ray diffraction (XRD), porosity, grain size distribution, cold crush strength, modulus of rupture, linear shrinkage, bulk density, water absorption, loss on ignition, moisture content, plasticity index and refractoriness.Findings. Results of XRD of the samples indicate that the deposit is of three crystalline components of quartz -64.73%, feldspar -6.05% and kaolinite -29.22%. XRD also identified the dominant oxide compositions of the clay to be silicon oxide and aluminum oxide; while titanium oxide and manganese oxide were found in traces. Laboratory analysis on physical properties of the clay like porosity, grain size distribution, cold crushing strength, modulus of rupture, linear shrinkage, bulk density, water absorption, loss on ignition, moisture content, plasticity index and refractoriness were carried out, and well presented in the paper.Originality. The results can be compared to standard requirements in clay soil for ceramic productions. Practical implications.The results from this investigation can guide intending investors in their decision making. It can also be used as supporting document when applying for mine license and bank loan.

Purpose. To determine the geoid heights from various control points of the quarry located in the northern and southern zones of the limestone deposit of the Lafarge WAPCO Cement Ewekoro in Ogun State, Nigeria. Methodology. The GPS and levelling data were used to determine the geoid heights from various control points of the quarry located in the northern and southern zones of the limestone deposit. The geoid heights obtained from GPS-Levelling data were used for three surface models which are polynomial regression model, inverse distance model and nearest neighbour model. These models were used to crossvalidate the geoid heights for the control points. Findings. The result shows that the deviations of the geoid heights for the GPS/Levelling and models are between 0.03 and 0.01m respectively. The models were used to generate contour maps that reveal the better location where the flood can be channelled. Originality. The results can be compared to the data obtainable during operations carried out in the quarry. Practical value. The flood in the quarry face will be better controlled by creating a sump at the lowest point on the elevation maps and controlled drilling to give better aeration.