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Road Log From Pachuca-Real Del Monte to Mexico, D.F., and Taxco

January 01, 1990


The morning will be spent in travelling directly to Real del Monte where the Purisima Concepción mine is located. The underground visit will be made on the 550 and 600 levels on the north-striking Veta Dios Te Guie. The Real del Monte Formation is the principal host rock, characterized by a great thickness of flow breccias. Mineralization along the vein contains silver, zinc and lead, distributed in massive lenses or disseminated in the quartz gangue, or in the altered wall rock. Later the route will be retraced to Pachuca and then continue to the south-southwest over lake bed covered basins, surrounded by volcanic centers. The route will cut across Mexico City (Fig. 78) and join the periferico on its west side. The route, now a toll road, continues southwards across Late Cenozoic volcanic terrane dropping down into the valley where Cuernavaca is situated. From there, the route continues southwards over the valley-filling Cuernavaca Formation that overlies folded and faulted Cretaceous strata, as far as Río Amacuzac, where highway 95 swings to the southwest, and straddles the southern fringe of the Trans Mexican Volcanic Arc, and the Morelos-Guerrero basin to the south. The sequence in the section is one of increasingly lower stratigraphic position towards the southwest. Included here is the Balsas conglomerate of Early Tertiary age, the Mexcala Formation shale and sandstones of Late Cretaceous age, the Morelos Limestone of the Middle Cretaceous and finally the Taxco schist of Jurassic age.

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Society of Economic Geologists Guidebook Series

Mexican Silver Deposits

K.F. Clark
K.F. Clark
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January 01, 1990




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