Browsing by Author "Alaku, I. O."

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    Geochemical Investigation and Physical Impact Assessment of Artisanal Gold Mining, Kataeregi, North-Central Nigeria
    (INTERNATIONAL JOURNAL OF SCIENCE FOR GLOBAL SUSTAINABILITY, 2016-06) Omanayin, Y. A.; Ogunbajo, M. I.; Waziri, N. M.; Ako, T. A.; Shuaibu, A. M.; Alaku, I. O.
    The geochemistry of mine products and stream sediments from Kataeregi area in Northcentral Nigeria was studied with the objective of environmental hazards assessment that is caused by artisanal gold mining activities through field work and laboratory analyses. The field work involves the observation of physical impact of mining on the environment and collection of representative samples along the streams, mined site and tailings within the location of study. The sediment samples were analyzed using X-ray fluorescence spectrometry. The result obtained from laboratory analysis was compared with the ideal average crustal concentration of the elements in upper continental crust. Field observation revealed that mining activity has impacted on the environment with land destruction, loss of vegetation and erosion of soils. Geological field mapping show the area is underlain with Migmatite-Gneiss complex, Mica Schist, Granite and Sandstone lithologies. Results from geochemical analysis revealed that sediments are enriched with elements such as Au (0.23ppm), Ag (2.59ppm), Hg (0.21ppm) and Mo (1.14ppm). The presence of Hg in sediments can get consumed directly or indirectly through food chain and passed on to human. Keywords: Artisanal gold mining; Sediment geochemistry; degradation of land; Contamination; North-central Nigeria.
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    Litho-Geochemistry, Petrogenesis and Mineralisation Potential of Amphibolite-Schists Around Gadaeregi Area, North-Central Nigeria
    (Journal of Environment and Earth Science, 2017) Olose, M. A.; Abdulkadir, H.; Chaanda, M. S.; Alaku, I. O.; Omanayin, Y. A.; Iyah, R. O.
    Abstract This study investigated the geochemical compositions of Amphibolite-schists around Gadaeregi area of North Central Nigeria to establish the petrogenetic evolution, geotectonic setting and associated potential mineralization. It was carried out across an area of 134.4km2 within Bida sheet 184 NE on a scale of 1: 25, 000. The area is bounded by latitudes 9o 22ꞌ 00ꞌꞌN - 9o 28ꞌ 00ꞌꞌN and longitudes 6o 17ꞌ 00ꞌꞌE - 6o 24ꞌ 00ꞌꞌE. Systematic field investigation was carried out which revealed that the area is underlain majorly by migmatite-gneiss, amphibolite schist and granite. Ten (10) samples of amphibolite-schist were subjected to geochemical analysis with reference to major oxide and trace elements using X-ray fluorescence (XRF). Plotting the geochemical results on typical discrimination diagrams revealed that the amphibolite-schists are of calc-alkaline and tholeiitic affinity. It shows a sedimentary origin, basaltic/andesitic progenitor and mixed (continental and oceanic) tectonic setting. Furthermore, the mineralization potential of the area was noted by comparing the result of trace elements in this study with their respective established crustal abundances, hence, Pb, Ag, Bi, Hg, Re, Pd, Ru and Au showed considerable anomalous concentrations in all/or some of the samples, though Au showed highest anomalies. This agrees with the fact that potential mineralization of Au is generally high within the schist belts of Nigeria. It is highly recommended that high resolution sampling at a larger scale be made to delineate the points with high prospects. Keywords: Gadaeregi, Amphibolite-Schist, Geochemistry