The San Martín Mining District lies in the Sombrerete municipality, western Zacatecas State (Fig. 1). Geographic coordinates of the Industrial Minera México, S. A., San Martin Unit are 23°40′N and 103°45′W. A paved road leading east from the installations for 6 km joins Federal Highway 45 (Panamericana) at the Zacatecas-Durango leg; the town of Sombrerete with its railroad station is about 10 km south of the junction. There is a small-aircraft landing field 15 km west of the mine. The area of the installations is at an elevation of 2,600 m; climate is temperate-humid with relatively severe winters; temperatures fluctuate between a low of −6 °C in winter and a high of 30 °C in summer.
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.