Geology of the Tizapa Ag, Zn, Pb, Cu, Cd, and Au massive polymetallic sulfides, Zacazonapan, Mexico
J. de J. Parga P., J. de J. Rodriguez S., 1991. "Geology of the Tizapa Ag, Zn, Pb, Cu, Cd, and Au massive polymetallic sulfides, Zacazonapan, Mexico", Economic Geology, Mexico, Guillermo P. Salas
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In 1977, Guillermo P. Salas, general director of the Mineral Resources Council, commissioned special studies manager José Luis Lee Moreno to evaluate the geologic-mining potential of the Neovolcanic Axis Metallogenetic Province of Salas (1975). Detailed studies of ERTS-1 satellite images over approximately 10,000 km2 of the province had revealed important tectonic features suggesting as yet undiscovered ore deposits. The evaluation project began in 1977 under Raúl Cruz Ríos.
Regional geology (Nieto and others, 1977) indicated extensive volcanic-sedimentary outcrops at the boundary with the Sierra Madre del Sur province, and exploration for volcanogenic massive sulfides was recommended. By mid-1978 the first Tizapa samples had tested successfully, and the Metamorphic Rocks Project was set up in January 1979. Since that time, exploration and preliminary evaluation of the deposit have continued without interruption.
Tizapa lies 67 km directly 60° southwest of Toluca and 4 km southeast of Zacazonapan in southwestern Mexico State (Fig. 1). Highway 130 from Toluca leads to Temascaltepec, from where unpaved roadways reach Zacazonapan.
Fieldwork included a semidetailed regional geologic survey using part of the “Valle de Bravo” Sheet E-14-A-46 (Direccion General de Estudios del Territorio Nacional, scale 1:50,000) as topographic base; subsequent 1:1,000 topographic mapping over approximately 1 km2 as a basis for detailed geological and aerial geophysical electric surveys; direct diamond-drilling with core recovery; and a 30-m prospecting tunnel.
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.