Geology of the Fresnillo Mining District, Zacatecas
The Fresnillo Mining District is located in central Zacatecas State about 60 km northwest of the town of Zacatecas at geographic coordinates 23° 10′ 29″ and 102°52′39″ and an average elevation of 2,200 m (Fig. 1). Fresnillo is connected directly with Mexico City by Federal Highway 45 (Panamerican) and the México-Ciudad Juárez railroad; Zacatecas airport is 35 km southeast of the district.
The state of Zacatecas has been renowned for its mines since the time of the Spaniards; expeditions under Juan de Tolosa in 1546 discovered innumerable veins in the area of today’s town of Zacatecas. Francisco de Ibarra discovered Fresnillo farther north in 1554, naming it “Aguas del Fresnillo” (Isunza, 1981). Shortly after, he explored the area called Cerro Proaño where Diego Fernández de Proaño had already located some veins. These discoveries were followed by many others in the state, including Sombrerete, and ConcepciÃ³n del Oro (Fig. 1).
Figures & Tables
This volume was developed, produced, and privately printed in Mexico, in Spanish, by the late Ing. G.P. Salas in 1988, as a Mexican contribution to the Geology of North America, with the understanding that it would be translated into English for inclusion in the set. The translation is by Dr. Cecily Petzall of Caracas, Venezuela, with considerable figure translation and redrafting provided by GSA. Salas worked on the volume until his death, with much valuable help from Ing. Hugo Cortez Guzmán. The result is a valuable English-language synthesis of the information available to Salas in the early to mid-1980s about the geothermal, coal, and metal-mining sectors (and some non-metallic resources) of the economic geology of Mexico.