Jírova jáma
General Characteristics
County (administration):
Plzeňský kraj
District (town):
Klatovy
Village:
Hartmanice
Cadastre:
Javoří u Hartmanic
Map sheets:
22-31 Sušice, 22-313 Velhartice
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 > Moldanubicum > Metamorphic units in Moldanubicum > Moldanubicum of Šumava and South Bohemia
Stratigraphy:
Proterozoic - Paleozoic
Subject:
economic geology, mining and mining impacts
Geological phenomenon:
vein
Genesis:
hydrothermal mineralization, metamorphic (general metamorphism)
Rock:
quartz vein, paragneiss
Territorial protection
Level of protection:
Registered interesting geological localities
Part of national 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:
Eliška Žáčková, 09.06.2015
Updated by:
Kukal Zdeněk, 12.09.2017
Citation
The database Important geological localities of the Czech Republic: 3857 [online]. Prague: Czech Geological Survey, 1998 [cit. 2023-06-16]. Available from: https:// lokality.geology.cz/3857.
Location in map:
Assessment
Scientifical assesment:
medium
Educational assesment:
minor
Significance:
regional
Representativeness:
middle
Geological importance:
geo-regional value (mapping)
Locality conditions:
no problems
You can send information about a change in the status of the site to lokality@geology.cz
