Author: Helmut Hildebrandt

Professor (a.D.) am Geographischen Institut der Johannes Gutenberg-Universität Mainz.
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Osvaldo R. Arce Burgoa
Qualified professional in geological engineering and mineral processing, specializing in the exploration and development of ore deposits; achievements in more than 25 years experience in the Bolivian mining industry based on a solid education including a Doctorate of Engineering from the Tohoku Univ...



