The La Encantada District is located in the Ocampo municipality, Coahuila, at coordinates 28°22′N and 102°;35′W, at an elevation of 1,800 m. The nearest important town is Muzquiz, Coahuila, 120 km directly southeast on the Muzquiz-Boquilla del Carmen road, which is paved for 100 km and earthworks for another 120 km; bypaths connect La Encantada with Ocampo, Coahuila (160 km), and Ciudad Camargo, Chihuahua (Fig. 1); a light-aircraft runway is 20 km away.
La Encantada is one of the few mining districts in Mexico that was not discovered during the Spanish colonization. The first indications were found by local people in 1956, and Cia. MinerÃ Los Angeles immediately began to mine the San JosÃ©, Guadalupe, La Escondida, and San Francisco orebodies; La Prieta, the best producer to date, was discovered in 1963.
La Encantada, S.A., began operations in the area in 1967, installing a magnetic separation plant in 1973 that was later substituted by a flotation plant (1978). Two important discoveries are the “660” contact orebody and the high-grade mantos zone between levels 635 and 710.
Total tonnage in the known orebodies is about 4.0 MMT, averaging 450 g/ton Ag and 12 percent Pb (Rico, Aguilera, 1983). Mineral extracted by La Encantada, S.A., exceeds 1.8 MMT, averaging 350 g/ton Ag and 5.0 percent Pb (Trejo, de la Cruz, 1983).
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.