Assessing the Impacts of Coal Mining on Soil Quality in Kogi East, Nigeria

Abstract

This study investigates the effects of coal mining on soil physical and chemical properties in Kogi East, Nigeria, focusing on two mined sites (Ika-Ogboyaga and Okaba) and one unmined control site (Abache). Soil samples were collected from 32 plots across mined areas and 16 plots in the unmined site using a 200m x 200m belt transect method. Samples were analyzed for particle size, bulk density, soil pH, organic matter, nitrogen, phosphorus, exchangeable cations, and heavy metal concentrations using standard laboratory methods. Results show minimal differences in soil texture (sandy clay loam) across all sites, with slightly higher bulk density in mined areas (1.89±0.2g/cm3, 1.87±0.6 g/cm3), indicating soil compaction from mining activities. Chemical properties, including pH, organic carbon, nitrogen, and cation exchange capacity, showed minor variations, while heavy metal concentrations (Zn, Cu, Fe, Pb) were within safe limits across all sites. Analysis of Variance (ANOVA) (F-value=0.00449; F-crit=3.1907; P-value=0.995511) showed no significant differences in most soil properties between mined and unmined areas, suggesting limited impact of coal mining on soil quality in the region. To improve soil health and sustainability the study recommended mitigating soil compaction, implementing vegetation rehabilitation with native species, conducting continuous soil monitoring, raising community awareness, and promoting sustainable mining practices.