The Mineral of Pachuca

Abstract

Numbers 7, 8 and 9

Having it been the study of the principal mining districts in the country one of the fundamental reasons for the creation of the Instituto Geológico de México, it corresponded to the one in Pachuca to be the first one to be studied, because of its importance in the production of silver as well as in the innovations in extraction and in metallurgy. Having occurred, in 1895, an extraordinary flood within the mines, that completely paralyzed the activity of the main of them, the Federal Government commissioned the Institute to study the origin of the aforementioned waters and, at the same time, to do a study of the district. Such study was realized by means of a survey of the flooded area and of a geological map of the Pachuca Range, followed by a survey of almost all the exploited mines, doing the testing of the host rocks and their veins; finally, a topographic survey was made of the vein outcrops, in order to establish fracture and source-related systems. It is organized in nine chapters. The first one is an historical review. The second is the “Physiography of the Pachuca Range,” p. 21-26, which contains the topographic map of a part of the Pachuca Range, surveyed by the Comisión Científica del Valle, in 1865. The third chapter is “General geology of the Pachuca Range,” p. 29-50. The fourth chapter, “The veins of the Pachuca district,” p. 53-80, has the following sheets: (1) Topographic map of Pachuca’s mineral with the vein system, 1:10,000. (2) Map of the mining claims, 1:20,000. (3) Section of the veins according to the plane of maximum dip. Horizontal general projection of the works in the main mines veins, 1:5,000. (4) Vertical projection of the works in the main mines, 1:5,000. (5) Section of Pachuca to Real del Monte from West to East, on the veins of Analcos y Vizcaína, showcasing the works of the Compañía Real del Monte y Pachuca. The fifth chapter is “Fracture systems.” The sixth chapter is “Description of the rocks of the Mineral of Pachuca,” by Ordóñez, p. 101-125. The seventh chapter is “Mines’ exploitation.” The eight is “Machinery and drainage.” The ninth and last one is “Metallurgy.”

Abstract taken from:

Gómez-Caballero, J. A. (2005). Historia e índice comentado del Boletín del Instituto de Geología de la UNAM. Boletín de la Sociedad Geológica Mexicana: Volumen Conmemorativo del Centenario Aspectos históricos de la Geología Mexicana, 57I(2), 149-185. http://dx.doi.org/10.18268/BSGM2005v57n2a3