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Almadén Mine, Almadén, Almadén District, Ciudad Real, Castile-La Mancha, Spain

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Latitude & Longitude (WGS84): 38° 46' 31'' North , 4° 50' 50'' West
Latitude & Longitude (decimal): 38.77528,-4.84750
GeoHash:G#: eyus9dy4m
Other regions containing this locality:Iberian Peninsula
Locality type:Mine
Köppen climate type:Csa : Hot-summer Mediterranean climate

A mercury mine started before 1850. Owned by Minas de Almadén.
Volcano-sedimentary Hg ores hosted in quartzite and volcanic rocks.
Almaden is the largest mercury deposit in the world, having produced more than 8 million recorded flasks of mercury (250,000 metric tons; 1 flask = 76 lb) from a volume of ore of approximately 450 X 600 X 50 m3. Has produced about 1/3 of the world's mercury.

The name Almadén stems from the Arabic al-ma 'daniy 'yun, "the mine" or "the mineral".

Commodity List

This is a list of exploitable or exploited mineral commodities recorded at this locality.

Mineral List

29 valid minerals.

Regional Geology

This geological map and associated information on rock units at or nearby to the coordinates given for this locality is based on relatively small scale geological maps provided by various national Geological Surveys. This does not necessarily represent the complete geology at this locality but it gives a background for the region in which it is found.

Click on geological units on the map for more information. Click here to view full-screen map on

Silurian - Ordovician
419.2 - 485.4 Ma

ID: 3191306
Paleozoic sedimentary rocks

Age: Paleozoic (419.2 - 485.4 Ma)

Lithology: Sedimentary rocks

Reference: Chorlton, L.B. Generalized geology of the world: bedrock domains and major faults in GIS format: a small-scale world geology map with an extended geological attribute database. doi: 10.4095/223767. Geological Survey of Canada, Open File 5529. [154]

Late Ordovician - Middle Ordovician
443.8 - 470 Ma

ID: 2499618

Age: Ordovician (443.8 - 470 Ma)

Description: Slate, sandstone, quartzite and limestone or volcaniclastic rocks

Lithology: Quartzite, slate, sandstone and limestone

Reference: Mapa Geológico de la Península Ibérica, Baleares y Canarias a escala 1:1.000.000. Instituto Geológico y Minero de España. [77]

Early Cambrian - Neoproterozoic
511 - 1000 Ma

ID: 3139337
Esquisto-Graovaquisco Complex

Age: Neoproterozoic to Cambrian (511 - 1000 Ma)

Stratigraphic Name: Esquisto-Graovaquisco Complex

Description: flysch (sediments)

Lithology: Major:{phyllite}, Minor{meta-sandstone,marlstone}

Reference: Asch, K. The 1:5M International Geological Map of Europe and Adjacent Areas: Development and Implementation of a GIS-enabled Concept. Geologisches Jahrbuch, SA 3. [147]

Data and map coding provided by, used under Creative Commons Attribution 4.0 License

This page contains all mineral locality references listed on 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 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.


Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Mining Annual review (1985) 119.
Crawford, J.W. (1988) Famous mineral localities: The Almaden mines Ciudad Real Spain. Mineralogical Record, 19(5), 297-302.
Saupe, F. (1990) Geology of the Almadén mercury deposit, province of Ciudad Real, Spain. Economic Geology, 85(3), 482-510.
Hall, C.M., Higueras, P.L., Kesler, S.E., Lunar, R., Dong, H., and Halliday, A.N. (1997) Dating of alteration episodes related to mercury mineralization in the Almadén district. Earth and Planetary Science Letters 148, 287-298.
Hernandez, A., Jébrak, M., Higueras, P., Oyarzun, R., Morata, D., and Munhà, J. (1999) The Almadén mercury mining district, Spain. Mineralium Deposita, 34, 539-548.
Calvo, M. (2003) Minerales y Minas de España. Vol II. Sulfuros y sulfosales. Museo de Ciencias Naturales de Alava. Vitoria. 705 págs.

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