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Book Chapter

Road Log From Fresnillo to Zacatecas

January 01, 1990


Most of the day will be spent underground and on the surface in the Fresnillo district. This consists of replacement chimney, manto and fissure-vein deposits, and disseminated sulfide ores, hosted mainly by Cretaceous marine sedimentary rocks. The base metal - silver deposits are zoned to the southeast, away from a quartz monzonite stock, with increasing silver, but decreasing base-metal content, distal to the stock. Wall rock alteration adjacent to the stock consists of silicification and calc-silicate formation, partially replaced by sulfide mineral. Wall rock alteration around veins exhibits potassic, phyllic, argiJlic and propyllitic alteration with increasing distance from the mineralized fractures. The ores contain recoverable amounts of lead, zinc, copper, silver and gold.

The latter part of the day consists of a short journey from Fresnillo to Zacatecas, passing over a wide, cultivated valley, but climbing in elevation to about 2,250 m, where the colonial city of Zacatecas is situated, flanked by sierra in which the fissure-vein mineral deposits are located.

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Society of Economic Geologists Guidebook Series

Mexican Silver Deposits

K.F. Clark
K.F. Clark
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Society of Economic Geologists
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January 01, 1990




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