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Santa Eulalia District, Mun. de Aquiles Serdán, Chihuahua, Mexico

This page kindly sponsored by Peter Megaw
 
Latitude & Longitude (WGS84): 28° 35' North , 105° 50' West
Latitude & Longitude (decimal): 28.5833333333, -105.833333333


The Santa Eulalia Mining District lies in central Chihuahua, Mexico at latitude 28o 35' N; longitude 105o 50' W; about 360 km south of El Paso, Texas and 23 km east of Chihuahua City (Fig. 1). The district occupies the approximate center of the north-northwest elongate, fault-bounded Sierra Santa Eulalia (a.k.a. Sierra Santo Domingo) whose peaks rise up to 700 m above the surrounding plains. Maximum elevations exceed 2400 m and the numerous deep canyons carved into the limestone and volcanic rocks of the range create a very rugged topography. Santa Eulalia has been in nearly continuous production for over three centuries (1703-present) and ranks as one of Mexico's chief silver and base metal producers with over a half billion troy ounces of silver and nearly 6 million tonnes of lead and zinc recovered. The City of Chihuahua was built by Spanish pioneers on the riches emanating from Santa Eulalia over the first 200 years of mining and, although modern industry now dominates Chihuahua's economy.

In a regional geological and mineralogical perspective, Santa Eulalia is the largest of a number of similar Carbonate Replacement Deposits that occur in a 2200 km long belt running from Hidalgo State to the Chihuahua-U.S.A. border…and into the USA (Megaw et al., 1988). This belt of deposits includes many of Mexico’s most prolific specimen-producing mines such as: Ojuela, Naica, Concepcion del Oro, Los Lamentos, San Carlos, San Pedro Corralitos, Charcas and Sabinas-San Martin. That these deposits are prolific specimen producers stems from aspects of their primary genesis and subsequent oxidation that create abundant open space during times when crystal growth potential is high. Additionally, the largest Carbonate Replacement Deposits characteristically underwent multiple stages or pulses of mineralization and oxidation, which results in mineralogical overprinting and the creation of a wide range of pseudomorphs. Santa Eulalia is especially well endowed in this regard.

The Sierra Santa Eulalia consists of Cretaceous carbonate and evaporite strata deformed into a broad, north-northwest-trending, doubly-plunging anticline with generally gentle dips. These rocks were subsequently deeply eroded and unconformably buried by a southward-thickening succession of early- and mid-Tertiary volcaniclastic and caldera-related volcanic rocks. Pre and intra-mineral intrusive dikes and sills are important ore localizers and mineralization is closely linked in time and space to distinctive felsite intrusions. Post-mineral faulting or deformation is minimal, so erosion and oxidation from meteoric waters is all that has happened to the ores since their deposition.

The mining district is divided into the West and East Camps, based on a combination of geography, production and style of mineralization. The West Camp (a.k.a. The Main Mineral Zone; Prescott, 1916 and Hewitt, 1968) lies on the western flank of the range and is characterized by massive sulfide manto and chimney orebodies with local, high-level iron-calcic skarns. The East Camp (a.k.a. the San Antonio mine area) lies on the eastern fringe of the range and is characterized by bilaterally symmetrically zoned, intrusion-cored skarns with peripheral massive sulfide manto bodies. The 2.5km wide intervening zone, known as the Middle Camp, contains minor mineralization and saw limited production, but is generally considered barren. The ultimate source of the district mineralization is actively being sought, but remains elusive.

Mineral List

Mineral list contains entries from the region specified including sub-localities

Acanthite

Actinolite

Adamite

Alabandite

Albite

'Albite-Anorthite Series'

Alunogen

Andradite

Anglesite

Anhydrite

Ankerite

'Anorthoclase'

Aragonite

var: Flos Ferri

Argentojarosite

Argentopyrite

Arsenopyrite

Augite

Aurichalcite

'Axinite Group'

Azurite

Baryte

'Biotite'

Bornite

Brochantite

Bromargyrite

Calcite

Caledonite

Caryopilite

Cassiterite

Celadonite

Cerussite

Chalcanthite

Chalcocite

Chalcophanite

Chalcopyrite

Chlorargyrite

var: Bromian Chlorargyrite

Cinnabar

Clinochlore

Columbite-(Fe)

Conichalcite

Copiapite

Copper

Corkite

Coronadite

Creedite

Cronstedtite

Cryptomelane

Cuprite

Dawsonite

Descloizite

Diaphorite

Diopside

Dolomite

Epidote

Epsomite

Fayalite

Fluoborite

Fluorite

Franklinite

Freibergite

Galena

var: Argentiferous Galena

Goethite

Gold

Goslarite

Greenockite

Grossular

Groutite

Gypsum

var: Selenite

Haiweeite

Halite

Hedenbergite

Hedyphane

Helvine

Hematite

Hemimorphite

Hetaerolite

Hisingerite

Hollandite

'Hornblende'

Hübnerite

Hydroxyapophyllite-(K)

Hydrozincite

Ilmenite

Ilvaite

Iodargyrite

Jamesonite

Jarosite

Jeanbandyite

Kaolinite

Kutnohorite

Legrandite

Leucoxene

'Limonite'

Linarite

Ludlamite

Magnetite

Malachite

'Manganese Oxides'

Manganite

Marcasite

Massicot

Melanterite

Mimetite

Minium

Mirabilite

Montmorillonite

Mottramite

Murdochite

Muscovite

var: Illite

Natanite

Natrojarosite

Nontronite

Nováčekite-I

Nsutite

Orthoclase

Plattnerite

Plumbojarosite

Polybasite

Proustite

Pyrargyrite

Pyrite

Pyrolusite

Pyromorphite

Pyrrhotite

Quartz

var: Amethyst

var: Citrine

Ramsdellite

Raspite

Realgar

Rhodochrosite

Rhodonite

Rosasite

Sanidine

Siderite

Silver

Sklodowskite

Smithsonite

Sphalerite

var: Marmatite

Stibnite

'Stilbite'

Sulphur

Sylvite

Talc

Tennantite

Tetrahedrite

'Thénardite'

Thomsonite-Ca

Todorokite

Topaz

'Tourmaline'

Tremolite

'Uvite'

Vanadinite

Vesuvianite

Vivianite

Wickmanite

Willemite

'Wolframite'

Wollastonite

Woodruffite

Wulfenite

Zircon


149 valid minerals.

Localities in this Region


The above list contains all mineral locality references listed on mindat.org. This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to visit any sites listed in mindat.org without first ensuring that you have the permission of the land and/or mineral rights holders for access and that you are aware of all safety precautions necessary.

References

Prescott, B. (1916): The Main Mineral Zone of the Santa Eulalia District, Mexico. Am. Inst. Min. Eng. Trans., 51, 57–99. [focuses on oxide ore, in contrast to Hewitt (1943)]

Hewitt, W.P. (1943): Geology and Mineralization of the San Antonio Mine, Santa Eulalia District, Chihuahua, Mexico. Geol. Soc. Am. Bull. 64, 173-204.

Hewitt, W.P. (1968): Geology and Mineralization of the Main Mineral Zone of the Santa Eulalia District, Chihuahua, Mexico. Am. Inst. Min. Eng. Trans 241, 228-260.

Megaw, P. K. M., Ruiz, J. & Titley, S. R. (1988): High-temperature, carbonate-hosted Ag-Pb-Zn(Cu) deposits of Northern Mexico. Economic Geology 83, 1856-1885.

Megaw, P. K. M. (1990): Geology and geochemistry of the Santa Eulalia mining district, Chihuahua, Mexico. PhD Thesis, Univ. of Arizona, 461 pp. (http://arizona.openrepository.com/arizona/handle/10150/187549)

External Links


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