5. Zn-Pb mineralization in the Olkusz area

Field guide: Tomasz Krzykawski
One days field trip. September, 3rd(Friday)

Duration: 9 a.m. – 7 p.m. ( can be changed depends of traffic)
Starts: meeting point at 9 a.m. infront of the venue
Price include: bus transfer, snacks and refreshments in the bus, lunch, guide

The Olkusz ore body belongs to the Cracow-Silesian zinc and lead deposits. The body occurs in Middle Triassic carbonate rocks and consists chiefly of sphalerite, galena and iron sulfides. The ore bodies resulted from a succession of mineralization and brecciation processes. Now, only the one mine (the Pomorzany mine) is exploiting the ore, which is located ca. 2 km West from the Olkusz city. The area is known because of a very unusual form of the ore body. It is Schalenblende- compact, fine grained sphalerite of a mid-brown to yellow or cream colour, occurring in concentric layers with reniform surfaces which also may contain intergrown, marcasite, pyrite, galena and possible wurtzite. It is believed to have formed by relatively rapid crystallization of a low temperature sulfide gel.
This field trip will be rare occasion to visit the last Zn-Pb mine in the Central Europe, which is still operating. Participants will drive into the mine by car. During the visit, system of the ore exploration will be shown as well as the main ore body with country rocks. The mine will give possibility to collect samples.
Second part of the trip will be in the Dolina Prądnika that is running through the Kraków-Częstochowa Upland (Jura Krakowsko-Częstochowska) in Poland’s Lesser Poland voivodeship. This area is famous because of its unusually exposed Jurassic limestone formation, which is an result of the karst topography. This area contains numerous limestone cliffs, ravines, and over 400 caves. A short stop in the Ojców village is provided.

Min. participants: 10
Max. participants: 17