A Study On The Applications Of Geospatial Engineering Techniques In Mineral Mapping And Geotoxicological Risk Assessment Of Mining Land Contamination In Ulu Johan, Kinta Valley Tinfield

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dc.contributor.authorABU-LIBDA, OSAMA AHMAD MUSTAFA
dc.date.accessioned2016-08-18T06:44:41Z
dc.date.available2016-08-18T06:44:41Z
dc.date.issued2008
dc.description.abstractNatural mineralization and intermittent mining operations in Ulu Johan, Kinta Valley tinfield have resulted in generating enormous quantities of contaminants of potential hazard in the environment, thereby contaminating the land asset and imposing significant risk to human health and ecosystem. A geoenvironmental characterization and assessment of soil contamination planned in Environmental Site Assessment Phase I and Phase II, had been carried out in this study by the integration of state-of-the-art techniques of mining geoscience and geospatial engineering. The preliminary risk assessment phase revealed deterioration of land quality due to natural and anthropogenic disturbances of regolith materials. In the quantitative risk assessment phase, a geochemical exploration procedure was undertaken to collect, prepare and analyze a total of 25 GPSgeoreferenced soil samples extracted at average depth <40 cm by random sampling. The 10-mesh-sized samples were analyzed by ICP-OES for elements As, Zn, Mn, Pb, TI, Sb and Zr then mapped-out using geostatistical spatial interpolation modeling by kriging and geovisulaized thematically in GIS. Geochemical mapping showed generally a spatial distribution pattern extending NNE-SSW, parallel to the zone of mineralization and mining activities. The anomalous environmental concentration levels above the global background values implied to the extent and severity of pollution levels on the contaminated land. GIS hazard mapping using geostatistical spatial interpolation modeling by kriging of geotoxicological indices of target contaminants of potential hazard revealed that As, Zn, Mn and Pb impose high potential to hazard exposure probabilities exceeding 80% to occur in ecological receptors located atinear hot spot sites, and that As and Pb impose high potential to hazard exposure probabilities exceeding 65% and 80%, respectively, to occur in human receptors located at/near hot spot sites. Geomedical inference of geotoxicity was supported by geobotanical remote sensing image processing of Landsat TM 5 and IKONOS multispectral data and a ground truth study, as a spatial qualitative approach supporting the GIS-quantitative ecological risk assessment. Geomedical inference of geotoxicity was also supported by environmental epidemiology study of human disease etiology as a spatial qualitative approach supporting the GIS-quantitative human health risk assessment. False-color composite infrared geobotanical data enabled distinguishing between stressed and healthy vegetation, and therefore identifying contaminated and noncontaminated lands. Modeling vegetation index of TNDVI revealed information on stressed vegetation was associated with contaminated land areas by increasing grades of pixel darkness. Tasseled Cap modeling showed the stressed vegetation cover associated with contaminated land areas characterized by high Soil Brightness Index and low Greenness Index. Epidemiological disorders were detected in inhabiting centers spatially proximal to contaminated areas; suggesting thereby a concealed linkage between local geology conditions and human health incidents. The geospatial results of geochemical mapping and geotoxicological risk analysiS suggested the decision to the need for applying urgency methodology at defined contaminated sites as priority to manage the contamination risk to an acceptable level before re-developing Ulu Johan's land asset. Geovisualizing these results cartographically in thematic maps will enable communicating risk to different concerned parties. The study suggested further the need to go on for conducting the Environmental Site Assessment Phase III in futureen_US
dc.identifier.urihttp://hdl.handle.net/123456789/2418
dc.subjectA Study On The Applications Of Geospatial Engineering Techniques In Mineral Mappingen_US
dc.subjectAnd Geotoxicological Risk Assessment Of Mining Land Contamination In Ulu Johan, Kinta Valley Tinfielden_US
dc.titleA Study On The Applications Of Geospatial Engineering Techniques In Mineral Mapping And Geotoxicological Risk Assessment Of Mining Land Contamination In Ulu Johan, Kinta Valley Tinfielden_US
dc.typeThesisen_US
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