1Hydrological Research Centre (HRC), Institute of Geological and Mining Research (IGMR), P. O. Box 4110, Nlongkak-Yaounde, Cameroon.
2Laboratory of Geological Engineering and Alterology, Department of Earth Sciences, Faculty of Sciences, University of Yaounde I (Cameroon).
3Laboratory of Geology, Department of Biological Sciences, Higher Teachers’ Training College, University of Yaounde I, P.O. Box 47, Yaounde, Cameroon.
Email: [email protected]