Geochemical And Mineralogical Characteristics Of Lithomargic Clay Types From Awaso Bauxite Deposit, Ghana: Implications For Possible Industrial Utilization

Stable Food Crops Turning Into Commercial Crops: Case studies of Teff, Wheat and Rice in Ethiopia Geochemical and mineralogical methods were employed in characterizing lithomargic clay types underlying Awaso lateritic bauxite deposit in southwestern Ghana in order to assess their suitability for possible industrial utilization. Representative samples analyzed from the deposit revealed kaolinite and gibbsite as the dominant minerals whilst accessory minerals found included goethite, rutile, biotite and muscovite with quartz conspicuously absent. It is possible to wash and separate most of the gibbsite component, which is prevalent in the > 90μm size fractions. On the basis of the results obtained from chemical and mineralogical analyses as well as diagnostic evaluative analyses, the lithomargic clay types could be exploited in the production of aluminium sulphate (alum) for water purification and alumino-silicate refractory material. The raw clay will however have to be beneficiated in order to optimize grade and recovery

Trace metal Contamination in Water from abandoned mining and non-mining areas in the Northern Parts of the Ashanti Gold Belt, Ghana

A survey was conducted on the levels of trace metals (Ni, Cu, Hg, Pb, Mn, Fe, Zn, Cr, Cd, Mg and Ca) in ground and surface water sources from the northern parts of the Ashanti gold belt. Water samples were collected from 67 boreholes, 24 wells, and 10 streams during dry and wet seasons for trace metal analyses using Philips PU 9200 atomic absorption spectrophotometer. The main objective was to determine whether trace metal contamination in the study area was as a result of mining or geochemical and biochemical processes within the aquifer. The results showed that ground water (pH range 4.09–7.29 and mean 5.87 pH units) was slightly acidic (low pH) than surface water (pH range 5.81–7.74 and mean 7.12 pH units). The ground waters (with conductivity range 96–1553 mS/cm and mean 407.7 mS/cm) in the study area were also more mineralized than surface waters (with conductivity range 113–540 mS/cm and mean 323.30 mS/cm). Correlations between the trace metals revealed expected process-based relationship between Mg2+ and Ca2+ (r = 0.76), derived mainly from the geochemical and biochemical processes within the aquifer. However, there were also other strong linear relationships between trace metals, such as Fe2+ and Ca2+ (r = 0.61); Mg2+ and Mn2+(r = 0.72), Hg2+ and Mn2+ (r = 0.61), that are not normally expected to be linked in terms of processes. All the well and stream water sources had one or more trace metal level outside acceptable limits set by the World Health Organization for drinking water, and only three borehole water samples at Konongo (Abronikrom), Ntronang (Ahenbronoso) andBomfa (Nkubem) were safe for human consumptio

Modelling of reaction-diffusion processes in ore leaching with nonlinear Kinetics

none3A.P. REVERBERI; L. TORO; F. VEGLIO'Reverberi, Andrea; L., Toro; Veglio', Francesc