The Josef gallery comprises a complex of tunnels in the Čelina, Mokrsko-west and Mokrsko-east mineral deposits excavated in 1980-1991 in connection with exploratory mining in the historical Psí hory gold-bearing area. The 1,835 m long main tunnel connects the Čelina deposit with the Mokrsko deposits. Two levels (+20 and +40) were excavated in the Čelina deposits, which feature 4 shafts and a ventilation corridor that leads to the surface on level +40.
At the portal end of the complex, a tunnel that houses the compressor room runs parallel to an intake tunnel that formerly supplied air to the compressor room. The former locomotive depot is located at a distance of 80 m from the portal and the former explosives store with the 90 m-high filled-in ŠP/K-1 shaft is located 750 m from the portal. The turnoff to the ŠP/K-2 shaft with a height of 133 m is situated at the 1820 m measuring point.
The corridors excavated in the deposits run in the east-west direction, while the niches are oriented north to south. This layout corresponds to the original mine maps. The numbering of the corridors west of the main tunnel are marked with odd numbers and those east of the tunnel with even numbers so as to ensure easy orientation for persons trapped underground in unexpected situations. Approximately 90% of the workings have not been equipped.
The Josef gallery is located in the Psí Hory gold ore district with the predominant occurrence of gold and tungsten. Stratigraphically, the site forms part of the Davel Formation of the Kralupo-Zbraslav Group of Proterozoic rocks featuring volcanic-sedimentary rocks of the clay zone – mainly volcanics (basalts, andesites, rhyolites) and sediments (hornblende) and their combinations (tuffs, tuffites), penetrated by younger intrusive rocks (granodiorites, albite granites). The entire area shows signs of complex, repeated, tectonic events (fractures, dislocations, etc.). The gold-bearing deposits are tied to fault zones in the rocks of the clay zone and in the surrounding rocks of the Central Bohemian pluton, and consist of quartz veins and vein swarms.
Czech Technical University, Prague
Faculty of Civil Engineering
Smilovice 93
262 03 Chotilsko