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Kasejovice, Nepomuk (Pomuk), Plzeň Region, Czech Republic

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Location is approximate, estimate based on other nearby localities.
Latitude & Longitude (WGS84): 49° North , 13° East (est.)
Margin of Error:~5km
Other regions containing this locality:Bohemia (Böhmen; Boehmen), Czech Republic
Köppen climate type:Cfb : Temperate oceanic climate
Name(s) in local language(s):Kasejovice, Nepomuk, Plzeňský Kraj

Mesothermal gold (orogenic-gold) mineralization.
The remains of abandoned old mines in the forest Kamajk. These mines date back to the year 1337. Jakub, Jan, and Alois were the best-known mines. Mining at Kasejovice took place mostly in the 18th and 19th centuries and at the beginning of the 20th century. Total gold production was probably much less than 1000 kg.

The site is situated in the easternmost part of the Kasejovice outlier of the Drosendorf Unit of the Moldanubicum. It is built by LP-HT biotite-cordierite migmatites (migmatitized gneisses) with rare intercalations of calc-silicate gneisses and scarce intrusions of granite-porphyry and aplite dykes.

The gold-bearing quartz veins are either hosted by mylonite zones (NE-SW) in the Moldanubian rocks or bound to local faults, subparallel to metamorphic foliation. Quartz veins 0.5–1 m thick strike NE-SW and dip 40–80° SE. Gold grade varies from 2 to 20 g/t, exceptionally reaching 50 g/t. (Zacharias 2002)

Four mineralization stages (Litochleb 1984): quartz stage (wolframite ± scheelite, quartz-1, apatite, rutile, tourmaline, arsenopyrite and pyrite-1); gold-bearing stage (quartz-2, muscovite, chlorite, pyrite-2, pyrrhotite, chalcopyrite-1, molybdenite, native bismuth, bismuthinite, various Bi-Te-S phases and gold-1); base metal “polymetallic” (Sb-bismuthinite, kobellite, Bi-jamesonite, Bi-berthierite, Bi-andorite, Ag-tetrahedrite, chalcopyrite-2 and gold-2); and calcite stage (calcite, dolomite, pyrite-3).

Mineral List

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

35 valid minerals.

Rock Types Recorded

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Mineralization age: Mississippian : 338.5 ± 1.3 Ma

Important note: This table is based only on rock and mineral ages recorded below and is not necessarily a complete representation of the geochronology, but does give an indication of possible mineralization events relevant to this locality. As more age information is added this table may expand in the future. A break in the table simply indicates a lack of data entered here, not necessarily a break in the geologic sequence. Grey background entries are from different, related, localities.

Geologic TimeRocks, Minerals and Events
ⓘ Molybdenite338.5 ± 1.3 Ma

Localities in this Region
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Czech Republic

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Litochleb J. (1984) Minerogeneze kasejovických zlatonosných žil (Minerogenesis of gold-bearing veins from Kasejovice). Sborník Hornická Příbram ve vědě a technice, sekce geol., mineral., geochem., lož. drahých kovů Au, Ag, 1984. p.257–264. Příbram. (in Czech).
Litochleb, J., Krištín, J., Šrein, V. (1990) Bismutové minerály zlatonosného zrudnění z Kasejovic v jz. Čechách (Bismuthian minerals from gold-bearing mineralization at Kasejovice, southwest Bohemia). Věst. Ústř. Úst. geol. 1990, 65 (5), 279–289. (in Czech).
Zachariáš, J., Pudilová, M., Žák, K., Morávek, P., Litochleb, J., Váňa, T., Pertold, Z. (1997) P-T conditions, fluid inclusions and O, C, S isotope characteristics of gold-bearing mineralizations within the Central Bohemian Metallogenic Zone. - Acta Univ. Carolinae – Geologica, 41 (3-4), pp. 167–178.
Litochleb, J. (1998) Mineralogie zlatonosného zrudnění z dolu Jakub u Kasejovic (jz. Čechy). Bulletin mineralogicko-petrografického oddělení Národního muzea v Praze, 1998, roč. 6, s. 102-112.
Zachariáš, J., Pudilová, M. (2002) Fluid inclusion and stable isotope study of the Kasejovice gold district, central Bohemia. Bulletin of the Czech Geological Survey, 2002. Vol. 77, No. 3, 157–165.

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