Abstract
Field studies (location Au pits, sampling of different layers of sedimentary sequences filling the pits, panning of sediments), litho-stratigraphic investigations, grain size analysis and outlining of depositional conditions revealed a characteristic fining upward sequence in all the sections of 08 Au-pits within the Betare Oya basin. A typical profile is 2.5 to 4.5 m thick and is composed of a 30 to 50 cm organic topsoil layer, underlain by a 1.5 m thick reddish brownish gold free saprolite, which is underlain by 1.5 m sandy section. From litho-stratigraphic investigations and grain size analysis results a quartz dominated gravelly 1.4 m thick layer consisting in boulders (275 mm), cobbles (2-−0.0148x2 + 1.2187x + 2.0344, R2 = 0.6929 (sandy layer); 2) y = 0.0617x2 + 1.0849x + 0.8097, R2 = 0.8694 (gravelly layer); and y > R2 is satisfied in both cases. This implies that Au recovery from these layers could be effective through gravity separation using sieves mounted on classifiers of 7 cm (sandy layer) and 10 cm (gravelly layer) diameter.
Highlights
All works done in East Cameroon before the year 2000 were limited to regional geological studies and minor mineral exploration activities (Fe and Ni-Co)
The sandy layer follows with averagely 02 Au grains
This work will contribute in defining the conditions of sedimentation, lithological setting, particle size, aspect ratio of pebbles from the Au horizons as well as their thickness and the gold grains count in different horizons in view to optimize the gold extraction from sediments
Summary
All works done in East Cameroon before the year 2000 were limited to regional geological studies and minor mineral exploration activities (Fe and Ni-Co). Present interest for gold in the region is linked to the revised Cameroon Mining code of 2004 This resulted to a kind of “gold rush” in Batouri, Garoua Boulaye and the Betare Oya district [2]. This work will contribute in defining the conditions of sedimentation, lithological setting, particle size, aspect ratio of pebbles from the Au horizons as well as their thickness and the gold grains count in different horizons in view to optimize the gold extraction from sediments. These may serve as a basis for gold exploration and recovery within the Lom basin and especially the area of study
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