Ivan Antonovich Barocci de Els - Geologist, Metallurgist, Berg-inspector
Based on the basis of archival and literary historical data the paper shows a summary of the huge contribution made by Ivan Antonovich Barocci de Els into development of economy of the Ural and Siberia as a geologist, metallurgist, organizer of building and director of the Nikolaevsky iron plant. Author shows the great role of this person as one of collaborators of the General-Governor N.N. Muraviev-Amursky in developing economy of the Irkutskaya Gubernia.