Extraction of low grade zinc ore found in Gumau-Toro town was carried out using gravity and froth flotation methods. Analysis of the chemical composition reveals that the crude ore contains 20.20% Zinc and other related minerals such as 66.72% SiO2, 2.36%.Pb, 16.62%Fe, 0.001%Ag, these are impurities that hindered the grade of zinc in this ore from appreciating. Fractional and grain sieve size results revealed that the liberation size of the ore is at -355+250µm assaying 32.41%Zn. At this liberation sieve size, the low grade zinc ore was subjected to four different beneficiation methods using five kilograms (5kg) each as charge into Wilfley shaking Table, Humphrey spiral concentrator, Air floating Machine and one kilogram (1kg) for froth flotation. Resulting products (concentrate and tailing) from these processes were analyzed using instrumentation method. Percentage recovery of each applied process was calculated. This was used to ascertain that the use of froth flotation that gives 74.32%Zn at a recovery of 84.62% stands out the best method for zinc extraction towards value addition to the low grade crude zinc ore. ©JASEM http://dx.doi.org/10.4314/jasem.v20i4.1

In this research, the assessment of the chemical composition of the Itobe marble deposit for comparison with the general limestone requirements for cement making was investigated.  Six pits were dug and carefully studied in the area. The research work is aimed at determining the suitability of the Itobe marble deposit in the manufacturing of cement, establish the nature, size and type of the deposit and to estimate the various impurities present and at what concentrations. The soil samples collected were analysed for their chemical properties. Samples were also obtained from river channels and from outcrops of the deposits. The result showed that an appreciable amount of the marble deposit, with CaO in the range of 32.95% to 50.05% and Silica ranging from 1.40% to 7.20%. From these chemical analyses, Itobe limestone showed a great potential in cement production to augment cement availability for building and civil engineering construction in Nigeria.