General Characteristics

County (administration): Plzeň Region
District (town): Klatovy
Cadastre: Dolejší Těšov
Map 1 : 50 000 (sheet No): 2231, 22313
Geological region: Šumava Moldanubicum - district KT; Moldanubicum of the Český les Mts.; Domažlice crystalline complex; W-Bohemian Pluton; W-Bohemian basic magmatites
Accessibility: - access without footpath
Technical object: shaft, old mine workings
ID : 3857

Geology

Short characteristics of the site: This locality called "Jírova jáma - the Jíra´s Pit" belongs geologically to the Moldanubicum Zone of the South Bohemia and Šumava Mts. This pit is about 30 m deep and represents one of the most interesting relics of the gold mining in this area.The rock itself can be classified as migmatitized paragneiss of the Monotonous Group of the Moldanubicum. The paragneiss is transected by a vein of hydrothermal quartz. Gold is present as an admixture in arsenopyrite mineral. The whole-rock average contens of gold is about 0,1 g/t. The paragneiss consists mainly of quartz and plagioklase with some potassium feldspar, and accessories. This locality is documented in the Register of old mine workings.
Regional geologic unit: Bohemian Massif - crystalline complex and pre-Variscian Palaeozoic - Moldanubicum - Metamorphic units in Moldanubicum
Stratigraphy: paleozoikum až proterozoikum
Subject: economic geology, mining and mining impacts
Geological phenomenon: vein
Genesis: hydrothermal mineralization, metamorphic (general metamorphism)
Rock: quartz vein, paragneiss

Territorial conservation

Level of protection: Registered interesting geological localities
Protection of a geol. phenomenon: C - Geological phenomenon is the reason for a registration in the database of CGS
Part of the Geopark: Královská Šumava
Conflicts of interests: without conflicts

References

Žáčková E. a kolektiv autorů (2015): Vysvětlivky k základní geologické mapě ČR v měřítku 1 : 25 000 list 22313 Velhartice.- Česká geologická služba Praha.

Elaboration and Updating

Elaborated by: Žáčková Eliška, 09.06.15
Updated by: Kukal Zdeněk 12.09.17

Citation

The database Significant geological localities of the Czech Republic: 3857 [online]. Prague: Czech Geological Survey, 1998 [cit. 2024-05-02]. Available from: http:// lokality.geology.cz/3857.

Location in map: