Mexican Silver Deposits
Much of the first day's route is spent in travelling in a southerly direction through desert basins to Chihuahua City (Fig. 1). Numerous ranges are visible from the roadside and some stops are scheduled for description of lithologies and structures, particularly where mapping has been accomplished. Of particular interest is the lower Cretaceous in Sierra del Presidio and Banco Lucero, Los Medanos (dune field), Sierra La Candelaria and Sierra El Kilo intrusions, and the Tertiary volcanic stratigraphy of Sierra Gallego (near El Sueco), Sierra El Nido, Sierra de La Campana, and Sierra Sacramento. The Sierra de Samalayuca, near the community of the same name, has been considered by some to be Early Jurassic or Paleozoic in age, and it consists of weakly-metamorphosed sediments in an anticlinal structure.
The underground visit to the manto and breccia-pipe deposits at the Potosí mine, West Camp, Santa Eulalia completes the day.
0.0 Buenos dias. Proceed north on Santa Fe Street.
0.1 Turn right on frontage road (Wyoming) and proceed eastward through 4 traffic lights.
0.9 Join I-10, travelJing east, passing Southern Pacific railroad yards.
2.2 Pass Southern Pacific railroad yards on right. Continue east on I-10; keep in right lane. At 9:00 is southern flank of Franklin Mountains, where Bliss Sandstone is overlain by Ordovician strata (Fig. 2), and the El Paso Group overlies a Precambrian (Red Bluff) crystalline complex. The tectonic style of the Franklin Mountains comprises a north-trending, west-dipping, tilted fault block typical of Basin and Range structure (see Lovejoy, 1980).
The Rio Grande Valley is aligned from northwest to southeast, but curves prominently between Cerro Cristo Rey and the Southern Franklin Mountains, forming El Paso del Norte. Between the Franklin Mountains and the Hueco Mountains (to the east) lies the Hueco Bolson; a relatively flat valley which is filled with sand and silts and is the major source of El Paso's water supply.
The Franklin Mountains range is linear, extending from its southern limit near central El Paso, north and slightly west for approximately 24 km, to a point about 6 km north of the Texas New Mexico boundary. The range is roughly 5 km wide. The highest point, North Franklin, or Cabeza de Vaca Peak, is approximlately 2,390 m above sea level. Precambrian igneous rocks comprise North Franklin Peak, making it the area of greatest structural relief in the state of Texas.
The oldest rocks exposed in
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Table of Contents
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First Day
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Mineralization in the Santa Eulalia Mining District, Chihuahua, MexicoAuthor(s)Peter K.M. MegawPeter K.M. MegawDepartment of Geosciences, University of Arizona, Tucson AZ 85721Search for other works by this author on:
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Second Day
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Third Day
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Geology and Mineral Deposits of the Parral Mining DistrictAuthor(s)Edmundo de Los Santos BorbollaEdmundo de Los Santos BorbollaZinc de México, S.A., Unidad Parral, Parral, ChihuahuaSearch for other works by this author on:
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San Francisco Del Oro District, ChihuahuaAuthor(s)Luis R. Escudero Ch.;Luis R. Escudero Ch.Minera San Francisco del Oro, S.A. de C. V., Chihuahua, MexicoSearch for other works by this author on:Castillo N. Fernando;Castillo N. FernandoMinera San Francisco del Oro, S.A. de C. V., Chihuahua, MexicoSearch for other works by this author on:Zanella F. RogelioZanella F. RogelioMinera San Francisco del Oro, S.A. de C. V., Chihuahua, MexicoSearch for other works by this author on:
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Geology and Mineral Deposits of the Santa Barbara District, Chihuahua, MexicoAuthor(s)J. Roberto Silva M.;J. Roberto Silva M.Minerales Metalicos Del Norte, S.A., Chihuahua, MexicoSearch for other works by this author on:Marco A. Gonzalez N.Marco A. Gonzalez N.Minerales Metalicos Del Norte, S.A., Chihuahua, MexicoSearch for other works by this author on:
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Fourth Day
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Ore Deposits of the Sierra De Santa Maria, Velardena, Durango, MexicoAuthor(s)Allen L. Gilmer;Allen L. GilmerMarathon Oil Company, Special Projects Group 5555 San Felipe, Houston, Texas 77056Search for other works by this author on:José Conde C.José Conde C.Minerales Metalicos del Norte Unidad Velardeña, Velardeña, Durango, MéxicoSearch for other works by this author on:
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Fifth Day
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Sixth Day
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A Caldera Complex Associated With the Zacatecas Mining DistrictAuthor(s)Benjamin F. Ponce S.Benjamin F. Ponce S.Department of Geological Sciences, University of Texas at El PasoSearch for other works by this author on:
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Geology of the Real De Angeles Ore Deposit, Zacatecas, MexicoAuthor(s)Mark F. Pearson;Mark F. PearsonChen-Northern Inc., Helena, Montana, USA.Search for other works by this author on:Kenneth F. ClarkKenneth F. ClarkUniversity of Texas at El Paso, USA.Search for other works by this author on:
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Seventh Day
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Ore Deposits of the Guanajuato District, MexicoAuthor(s)Francisco Querol;Francisco QuerolCompañía Fresnillo, S.A. de C.V.Search for other works by this author on:Ricardo NavarroRicardo NavarroGuanajuato Group, Torres Mine, Gto.Search for other works by this author on:
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Geology of El Cubo Mine and Area, Guanajuato, MexicoAuthor(s)John A. Randall RobertsJohn A. Randall RobertsConsultant, Guanajuato, Gto., MexicoSearch for other works by this author on:
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Eighth Day
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Geology and Mineral Deposits of the Pachucareal Del Monte District, Hidalgo, MexicoAuthor(s)A.R. Geyne;A.R. GeyneCompañía de Real del Monte y Pachuca, S.A.; United States Geological Survey; Instituto de Geología, Universidad Nacional Autono1na de MéxicoSearch for other works by this author on:Carl Fries, Jr.;Carl Fries, Jr.Compañía de Real del Monte y Pachuca, S.A.; United States Geological Survey; Instituto de Geología, Universidad Nacional Autono1na de MéxicoSearch for other works by this author on:Kenneth Segerstrom;Kenneth SegerstromCompañía de Real del Monte y Pachuca, S.A.; United States Geological Survey; Instituto de Geología, Universidad Nacional Autono1na de MéxicoSearch for other works by this author on:R.F. Black;R.F. BlackCompañía de Real del Monte y Pachuca, S.A.; United States Geological Survey; Instituto de Geología, Universidad Nacional Autono1na de MéxicoSearch for other works by this author on:J.F. WilsonJ.F. WilsonCompañía de Real del Monte y Pachuca, S.A.; United States Geological Survey; Instituto de Geología, Universidad Nacional Autono1na de MéxicoSearch for other works by this author on:
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Ninth Day
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Tenth Day