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Location: 3 km SE from Caceres, Spain
Extremadura New Energies Avenida de España 18, 2ACáceresSpain10001
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San José is a zinnwaldite mica replacement deposit hosted by pelitic shales of the Central Iberian Zone, with lithium mineralisation occurring predominantly within the slates and to a lesser degree in the quartz carbonate veins which have been historically mined for tin. The rock which hosts mineralisation at San José is comprised roughly in equal parts mica, quartz and tourmaline. San José is a bulk-style deposit. Mineralisation at San José has not been closed off and is open at depth and along strike.The San Jose Deposit was formed by an amalgamation of quartz and quartzpegmatite veins, which formed a stockwork hosted by metasediments. The mineralisation is disseminated in both the host as lithium micas and the veins hosting tin as cassiterite, lithium as amblygonite-montebrasite and minor tungsten as wolframite. The lithium is found mainly in the micas of muscovite-fengite type in the host rock and in lesser proportion in the amblygonite-montebrasite of the veins.Primary mineral occurrences in the area appear to be of 3 types, lodes, stratabound or stratiform. The lode deposits are essentially quartz vein or stringer systems that fill late-Variscan Orogeny fractures and carry tin and/or tungsten minerals. Most of these occurrences, even if they are hosted by meta-sediments are regarded as being related to the ubiquitous lateVariscan granitic intrusions.Mineralisation within quartzite is typically low-grade. The pervasive nature of mineralisation (broad, relatively homogeneous distribution) is likely derived from a deep-seated intrusive source. Mineralisation is open at depth and has not been closed off by drilling.
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