This article is in accordance with several activities developed under the project "Organização, Restauração e Difusão do Acervo Técnico Científico da UFOP: Novos Elementos para a História da Ciência no Brasil". Initially, antique scientific equipment was cleaned and restored. Found then, were documents revealing unknown features of Ouro Preto School of Mines, its members and former students. These documents provide a better understanding of the role played by OPSM in the organization of the "Geology Sections" where the state of the art of our mining industry and research activities were displayed at the Universal Expositions.
Ouro Preto School of Mines (OPSM); Universal Expositions; Geology Sections
