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one of the world’s biggest mercury deposits, in the northern foothills of the Sierra Morena, in the Ciudad Real Province of New Castile in Spain. Until the tenth century the deposit was mined in order to obtain cinnabar paint; later Almadén became one of the world’s major mercury suppliers. At present the extraction of the metal reaches 1,500 -2,000 tons a year, about 40 percent of the world total. The total mercury extraction for all the time the deposit has been exploited is estimated at 250,000 tons. The mercury content in the ore dropped from 10 percent in the early period of the exploitation of the deposit to 5–6 percent in the mid-20th century.

The deposit is composed of Lower Paleozoic shales, sandstones, and quartz, compressed into steep folds and broken folds. Some folds are filled with diabasic and quartz porphyries of the Cenozoic age; these porphyries are thought to be at the origin of the deposit. Ore is found in a band 20 km in length; these are linked with quartz seams forming three parallel ore deposits. Some of the ore beds are 300 -500 m long, with a thickness of 3–12 m, and the mines run as deep as 500 m. The ore consists of fine-grained quartz and cinnabar, with admixtures of pyrite, sericite, calcite, dolomite, barytes, zeolites, and bitumens. Almadén is a hydrothermal deposit; the ore is formed through sedimentation from hot mineral water solutions filtered through seams of cracked quartzite.


Park, C. F., and R. A. MacDiarmid. Rudnye mestorozhdeniia. Moscow, 1966. (Translated from English.)


References in periodicals archive ?
Carl Kukkonen, reported, "We are excited to be working with Almaden Energy Group.
Completed in 1988 and renovated in 2010, Ten Almaden is a 17-story, LEED Certified Gold office tower that is 89 percent leased to tenants including Citibank, Comcast, Robert Half International, Rosetta Marketing Group and Turner Construction Company.
The announcement of the plant and training facility was made following the signing of a deal by the DSO Authority (DSOA) and Chang Whou Almaden.
Almaden, one of the world's largest producers of photovoltaic anti-reflective coated glass, is setting up the plant at DSOA's tech park.
Alzarooni said: "We welcome Chang Zhou Almaden to the hi-tech park and look forward to a symbiotic partnership with the world's largest producer of anti-reflective glass.
The agreement was signed by Dr Mohammad Alzarooni, vice-chairman and chief executive officer of the DSOA; and Jinxi Lin, chairman of Chang Zhou Almaden, during Gitex Technology Week.
Poliquin, said, 'We at Almaden are pleased with the work being conducted by our partner and are very encouraged by the new results.
But just up Cienega Road from old Almaden, Josh Jensen has been making great wine for more than 30 years--Pinot Noirs that have earned his Calera Wine Company the highest respect from Pinot producers the world over.
Rio Ross") are pleased to announce that they have completed the acquisition of the El Pulpo project from Almaden Minerals Ltd.
IBM, one of the top corporate innovators in the country, taps similar sponsorship, but also uses its Ivory Tower connections to capture the best and brightest ideas and students, says Robin Williams, associate director at the San Jose-based IBM Almaden Research Center, one of eight IBM research facilities worldwide.
Ross River Minerals, a Canadian mining company, reached an agreement with Almaden Minerals, another Canadian miner, to buy 100% of the El Pulpo gold mine in Sinaloa, Mexico.
Almaden Street, between Broadway and West 11th Avenue: Wastewater work.