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Article History

Received: 8 May 2024

Accepted: 13 February 2025

First Online: 25 April 2025

Declarations

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: I am writing this letter to you to inform you that there is no conflict of interest regarding this manuscript. The content of the Manuscript comes from the results of my doctoral thesis that I defended in 2014 at the Brussels free University under the direction of prof Bertrand Francois and the co-direction of prof Cristian Dascalu who were at the time teaching researcher at University of Paris 6 (see thesis attached in the fille). During my thesis I published an article with Prof. Bertrand Francois and Prof. Cristian Dascalu (see Publication ). After my thesis at the free University of Brussels, I went to the National High School and Research Center of Caen in France for my Post doctorate in 2015 where I again published an article with prof Bertrand François (see publication ). After my post-doctoral and after spending two years as a teacher-researcher at the ALBI School of Mines in France, I was appointed as General Director of the Higher Institute of Mines and Geology of Boké in 2017 in Guinea, then as Rector of the University of Nzérékoré in Guinea, my current position. To complete the promotion of my thesis, I suggested to my former thesis director, Prof. Bertrand François, to make this publication. After a few discussions with him, he decided not to participate in the publication. The Manuscript was written entirely by my person.