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Pribram |
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Czech Republic |
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U
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Super Porphyry Cu and Au
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The Pribram group of uranium deposit is located within the central Czech Republic. Mineralisation within the district is dated at 278 to 275 Ma and extends along the north-western boundary of the Central Bohemian (345 to 335 Ma) pluton (which was intruded along the Bohemian Shear Zone) within low metamorphic grade Neoproterozoic and un-metamorphosed Cambrian rocks.
The Neoproterozoic is represented by a 2000 m thick flysch sequence of intercalated claystones, siltstones and conglomerates underlain by a volcano-sedimentary complex containing abundant acid tuffs. A relict of lower Cambrian rocks overlies this sequence. Both have been subjected to contact metamorphism by the Central Bohemian pluton within a 1000 to 1200 m wide aureole, with a 30 to 340 m wide biotite hornfels adjacent to the contact. The pluton, which forms the south-eastern border of the field is composed of granites, granodiorites and small gabbroic stocks.
The majority of the ore veins strike northwest or north-south and are steeply dipping (70 to 90° and crosscutting) with lesser shallow dipping, northeast oriented veins which in places are concordant with bedding. Ore structures are up to 2700 m long and have thicknesses from 0.5 to 1 m, but occassionally reached 15 m. There are 20 vein clusters in the group of deposits.
There are three mineral associations in these vein clusters, namely: 1). polymetallic, dominated by Pb, Zn and Cu minerals, 2). uraninite bearing, and 3). sulphide-(selenide)-carbonate. Calcite is the main gangue mineral in the second and third associations. Uranium is present as uraninite and uraniferous anthraxolite, with much less coffinite. These uranium minerals occur as veinlets, coatings and pods in calcite gange within the veins. Approximately 98% of the ore was taken from a 11 km long zone in the central part of the approximately 20 km long district.
The deposit had produced 41 742 tonnes of uranium to 1999.
For detail see the reference(s) listed below.
The most recent source geological information used to prepare this decription was dated: 2000.
This description is a summary from published sources, the chief of which are listed below.
© Copyright Porter GeoConsultancy Pty Ltd. Unauthorised copying, reproduction, storage or dissemination prohibited.
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Selected References:
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Kribek B, Zak K, Spangenberg J, Jehlicka, Prokes S, Kominek J 1999 - Bitumens in the late Variscan hydrothermal vein-type Uranium deposit of Pribram, Czech Republic: sources, radiation-induced alteration, and relation to mineralization: in Econ. Geol. v94 pp 1093-1114
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Porter GeoConsultancy Pty Ltd (PorterGeo) provides access to this database at no charge. It is largely based on scientific papers and reports in the public domain, and was current when the sources consulted were published. While PorterGeo endeavour to ensure the information was accurate at the time of compilation and subsequent updating, PorterGeo, its employees and servants: i). do not warrant, or make any representation regarding the use, or results of the use of the information contained herein as to its correctness, accuracy, currency, or otherwise; and ii). expressly disclaim all liability or responsibility to any person using the information or conclusions contained herein.
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