Browsing by Author "Bale, RB"

Now showing 1 - 5 of 5
  • Item
    Estimation of Reserve – Overburden Ratio of A Proposed Quarry Site Using Resistivity Survey: A Case Study of Ajebo, Near Abeokuta, Southwestern Nigeria
    (American-Euroasian Network for Scientific Information, 2011) Bale, RB; Bayewu, OO; Folorunso, IO; Oloruntola, MO
    The geophysical and geotechnical assessment of the granite deposit at Idi-Osan Ofagada village near Abeokuta, southwestern Nigeria, have been undertaken and the exploitation suitability of the deposit established. The area is underlain by the granite gneiss rocks of the Precambrian Basement complex of southwestern Nigeria. Fourteen Vertical Electrical Soundings (VES) of Schlumberger array were carried out on the areas covered with overburden to determine their resistivity characteristics, overburden thickness and the reserve tonnage of the basement rock. The compressive strength and the specific gravity of the rock were measured to determine its competency and density respectively. The area is gridded into 5 by 6 blocks for more accurate calculations of the parameter for the estimation of the reserve. The reserve is estimated for elevation datum of 150m, 160m and 170m. Taking into account the economic implication for the removal of overburden, a minimum ratio of overburden to basement thickness of 1:1 and a limiting 10m overburden is considered to be the economically exploitable area. The VES results showed a two to three geoelectric layers; the sandy weathered layer, clayey layer and the basement. The isopach and geoelectric sections revealed that the overburden thickness varies from 1.5m to 23.6m with the thickest overburden of 10m and above occurring in the north-western and south-eastern parts. Geotechnically, the deposit has an average compressive strength of 47.68N/mm2 Young Modulus of 633N/mm2 and specific Gravity of 1.615. The reserve estimates obtained for 170m, 160m and 150m elevation datum are 4.42 x 105, 17.17 x 105 and 37.09 x 105 tons respectively. The results showed that the exploitation of rock in the area is economically viable most especially at 160 and 150m datum
  • Item
    Hydrometallurgical application for treating a Nigerian chalcopyrite ore in chloride medium: Part I. Dissolution kinetics assessment
    (Springer, 2013) Alafara, AB; Kuranga, IA; Adekola, FA; Bale, RB; Ghosh, MK; Alabi, AGF; Sheik, AR; Folorunso, IO
    The dissolution kinetics of a Nigerian chalcopyrite ore in hydrochloric acid was studied in this article. Acid concentration, reaction temperature, and ore particle size were chosen as experimental parameters. The chemical and morphological studies of the ore before and after leaching at optimal conditions were carried out by X-ray di®raction (XRD) and scanning electron microscopy (SEM). It is revealed that increasing the acid concentration and system temperature and decreasing the ore particle size greatly enhances the dissolution rate. The dissolution kinetics was found to follow the shrinking core model for the di®usion control mechanism where the activation energy (Ea) of 32.92 kJ¢mol¡1 was obtained for the process and supported by morphological changes at a higher dissolution of 91.33%.
  • Item
    Hydrometallurgical Processing of Manganese Ores: A Review
    (Scientific Research, 2014) Baba, AA; Ibrahim, L; Adekola, FA; Bale, RB; Ghosh, MK; Sheik, AR; Pradhan, SR; Ayanda, OS; Folorunso, IO
    Hydrometallurgy is the most suitable extractive technique for the extraction and purification of manganese as compared to all other techniques including biometallurgy and pyrometallurgical processes. In the hydrometallurgical processing of manganese from its ore, the leach liquors often contain divalent ions such as iron, manganese, copper, nickel, cobalt and zinc along with other impurities which make manganese very difficult to separate. The processes employed for solution concentration and purification in the hydrometallurgical processing of manganese include precipitation, cementation, solvent extraction and ion exchange. Solvent extraction also proves more efficient and it plays vital roles in the purification and separation of the manganese as compared to all other techniques. A detailed review of the various steps involved in the hydrometallurgical manganese processing, concentration and purification processes and newer processes of extraction of manganese from ores and waste materials were discussed
  • Item
    Stable Isotope Characteristics of Akiri Vein Copper Mineralization, Nasarawa, Nigeria
    (Published by Faculty of Science, University of Port-Harcourt, 2015) Folorunso, IO; Bale, RB; Adekeye, JID
    The Akiri vein copper mineralization was investigated for its carbon and oxygen isotopic composition to determine the characteristics of the mineralizing fluid. Carbon and oxygen isotope analyses of Akiri siderite range between δ13C values (-1.05 to -1.71‰) and δ13O values (-14.94 to -15.18) respectively. δ 13C isotopic composition is comparable to values expected for Cretaceous marine carbonates. The 18O depletion in the vein siderite indicates dominant meteoric water sources involved for carbonates precipitation. This significant depletion between the δ18O compositions of Akiri siderite compared with carbonates from other parts of the basin probably indicate differential formational temperature or fluid composition
  • Item
    The Stratigraphy and Structural Evaluation of Akiri and its environs, middle Benue Trough, Nigeria
    (Published by Department of Science Education, Federal University of Technology, Minna, Nigeria, 2015) Folorunso, IO; Bale, RB; Adekeye, JID
    The petrology of rocks occuring in the areas of Wuse and Akiri in the Middle Benue Trough of Central Nigeria have been studied. The sediments were sampled and analysed by petrological microscopes was undertaken to characterise the minerals and elucidate aspects of their formation. The area is underlain by the Eze Aku Formation comprising shales, siltstones and sandstones and in places, conglomeratic ironstone, mudstones and limestones also occur. The shales are variably massive, nodular and paper- thinly laminated with concretional nodules in places. The sandstones are massively bedded, texturally coarse to medium and variably indurated while the siltstones are thinly laminated. These lithologies were cut by E /W and NW / SE trending, variably microscopic to 2.5 m thick copper mineralized veins. Thin section petrography of the host lithologies revealed quartz, feldspars (Microcline, plagioclase) and muscovite in the sandstone. Akiri vein deposits has significant chalcopyrite mineralization which occur as dissemination, veinlets and stockworks with well developed wall-rock silicification (alteration).