The Charcas Mining District is located about 110 km north of the city of San Luis Potosí at geographic coordinates 23°07′N and 101°06′W, with an average altitude of 2,200 m. The climate is temperate and semiarid; annual precipitation averages 450 mm.
Access is by a paved road that extends north for 80 km from Highway 57, and by 130 km of paved road leading south to San Luis Potosí; the México-Laredo Railroad runs 13 km east of the district (Fig. 1), which also has a light-aircraft runway. Local schools reach technical and preparatory levels.
Mining is the main economic activity followed by cattle raising, trade, and agriculture. Present population is 25,000, of which 1,300 family groups depend directly on the mining activity for a livelihood.
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.