Communities – Company Relation in Limestone Mining Region of Southwest Nigeria: The Ewekoro Socio-Economic View (Published)
A study to assess the socio-economic impacts of limestone quarrying and processing operations at Ewekoro, South-Western Nigeria has been carried out. Data were collected through the use of well structured pre-tested questionnaires and oral interview in order to assess the socio economic impact of quarrying and processing of limestone on the inhabitants of the community and the workers. The finding shows that limestone exploitation has both positive and negative effects on the host community and the workers. It also shows that the benefits derived by the host community like employment, good roads, schools and hospitals are insignificant when compared with the negative effects of the exploitation on the community which includes reduction in crop production, negligence of education by students, overcrowding and high competition for little-available social amenities. Besides, the socio-economic inputs of the company are not well felt by the communities due to politicizing of the executions. Appropriate recommendations were made to ameliorate these negative socio-economic effects.
SUBSURFACE GEOPHYSICAL MAPPING AND DRILLING OF ABA-ISU LIMESTONE DEPOSIT (SHEET 156E), SOUTH-EASTERN, NIGERIA. (Published)
Geoelectric mapping and drilling of Aba-Isu limestone deposit was carried out using a hybrid method, a combination of Wenner and Schlumberger resistivity techniques. The iso-resistivity maps indicated a roughly NW–SE trending of the limestone deposit. The resistivity values in the range of 40-260Ώm is inferred to be limestone with varying gradations, and relatively low resistivity values <40Ώm. Areas around the central line axis have resistivity values >100Ώm particularly for the “a” of 5m and 10m respectively and consistent and coincidental with the areas where the limestone massively outcropped. The study area indicated a 4-5 layer stratified alternating sequence of high and low resistivity horizons, the sequence start with high resistivity horizon with values >100 Ώm alternating with low-medium resistivity horizons with values in the range of 20-50Ώm. This sequence in 2 or 3 cycles and terminated by the highly conductive horizon with resistivity values of <20Ώms. The pseudo-sections, resistivity values greater 100Ώm are inferred as limestone, there is a consistency of these values on a trend coinciding with the central line axis. The same values are observed at various depths beneath the subsurface implying the occurrences of limestone which extend beyond 35m depth.