**Author details**

Sylvestre M. Ntomba1 \*, Christelle R. Magnekou Takamte2 , Dieudonné Bisso2 and Joseph Mvondo Ondoa<sup>2</sup>

1 Centre for Geological and Mining Research, Garoua, Cameroon

2 Department of Earth Sciences, University of Yaounde 1, Yaounde, Cameroon

\*Address all correspondence to: sylvestre.martial@yahoo.fr; sylmanto.gary@gmail.com

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