The Topia Mining District lies in northwestern Durango State at coordinates 25± I I'N and 106±33'W, 50 km from the Sinaloa-Durango state line and 100 km east of Culiacan. Sinaloa (Fig. 1 ). It occupies the physiographic transition between the Volcanic Highlands and the Barrancas Zone subprovinces of the Sierra Madre Occidental Province. Access to the district is by land and air. Commercial airlines fly to Topia from Durango and from Culiacan (Sinaloa). The Durango-Topia road runs for 390 km; the first 180 km, to Santiago Papasquiaro, are paved. Topia is equipped with municipal public services and schools to high-school level.
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.