Assessment of the Stone Quarrying Activities on Sustainable Environmental Management in Kajiado East Sub County, Kajiado County, Kenya

Abstract

Stone quarrying has remained a vital economic activity, providing essential raw materials for infrastructure development. However, its environmental and socio-economic implications have raised growing concerns, especially in developing countries. Quarrying activities have had both positive and negative effects on the biophysical environment and the livelihoods of nearby communities. While the industry created employment opportunities, improved local incomes, and contributed to infrastructure development, it also resulted in significant environmental degradation, including loss of biodiversity, dust and water pollution, lowering of the water table, soil erosion, land deformation, and increased health risks such as respiratory ailments and accidents. In Kenya, the rapid expansion of quarrying operations, driven by the high demand for building materials, intensified these challenges. Although several studies have examined the impacts on air and water quality in Kajiado County, few have comprehensively assessed the changes in vegetation cover and socio-economic effects in pastoral regions, such as Kajiado East Sub-County. This gap highlighted the need for a detailed investigation into the relationship between quarrying operations, environmental outcomes, and community welfare. The purpose of this study was to assess the effects of quarrying activities on the biophysical environment and socio-economic well-being of communities in Kajiado East Sub-County, and to propose sustainable management approaches. Specifically, the study sought to assess the impacts of stone quarrying on the biophysical environment, investigate its effects on local employment and livelihoods, appraise the existing policy, legal, and institutional frameworks governing quarrying operations, and develop a sustainable quarry management model applicable to Kajiado County and Kenya. A mixed-methods research design was employed, integrating a case study, descriptive survey, and cross-sectional analysis. Data were collected through stratified and simple random sampling of 500 respondents using questionnaires, semi-structured interviews, focus group discussions, direct field observations, and analysis of Landsat and Sentinel satellite imagery spanning 1993 to 2023. Land-use and land-cover changes were analyzed using ArcGIS, while SPSS 29 facilitated statistical analysis. The study revealed that quarrying significantly contributed to land degradation, reduced vegetation cover, altered topography, and polluted both surface and groundwater resources. Socio-economically, quarrying improved employment opportunities and household incomes but also displaced communities, reduced agricultural land, triggered conflicts, and increased health hazards. Chi-square tests confirmed significant associations between quarrying intensity and both environmental quality and socio-economic welfare. Respondents identified weak regulatory enforcement, poor inter-agency coordination, and political interference as significant obstacles to effective quarry management. The study recommended strengthening environmental enforcement units, integrating phased land rehabilitation into quarry licensing, establishing community benefit-sharing frameworks, and promoting multi-stakeholder quarry management committees to achieve balanced and sustainable development.