Geochemical Evaluation of Wastes and Soil Samples around Cassiterite Mine Sites in Plateau State, Nigeria

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Author(s) A. O. Owolabi| Z. O. Opafunso | L. Lajide
Pages 808-817
Volume 6
Issue 5
Date May, 2017
Keywords Acidity, Heavymetals, Cassiterite, Mine Sites, Igeo, Toxic Contaminants

The distribution of acidity and heavy metals in mine wastes and soil samples in the vicinity of cassiterite mine sites in Plateau State, Nigeria had been carried out. Samples of mine wastes were collected from the mine sites while soil samples were collected from farmlands beyond 450 m, 80 m, 330 m, 70 m, 430 m and 330 m from the mine sites of Rayfield, Gero, Sabongida Kanar, Kuru Jantar, Bisichi and Barkin Ladi respectively. These samples were analysed for pH and heavy metals at the Geochemistry Laboratory of the Nigerian Geological Survey Agency (NGSA) in Kaduna, Nigeria. The geo-accumulation index (Igeo) of heavy metals in soil and mine waste samples were thereafter determined. The pH values of the samples indicated that they were all acidic. The Igeo in the samples of the study area were of the order Fe > Mn > Cu > Cd > As > Pb > Cr. The average geo-accumulation indices (Igeo) of 2.1 + 0.3, 1.4 + 0.7, 1.6 + 0.4 and 1.4 + 0.4 for cadmium, arsenic, lead and chromium respectively in soil could lead to their accumulation in food crops due to water intake by plants from the soil. This could have serious health implication especially in children. The acidity as well as the heavy metal contamination reduced as distances from the mine increased for all samples collected from all the locations of the study area except copper. In habitants in close proximity to the mines should also be advised to relocate.

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