Category Archives: News

Traditionally our Chapter organizes autumn field trips to abroad. This time it was to neogene volcanic field in Central Slovakia, in area of Banská Štiavnica and Banská Bystrica. Field trip took place from 7th to 10th October 2016.

pseudomalachite

First day we visited quarry near Lehotka pod Brehmi. We have seen here a lot of perlite and some obsidian peaces, volcanic glass of neogene age.

Other day we focused on tertiary Fe, Cu mineralization in meta-greywackes and meta-sandstones of permian age in Ľubietová – Podlipa area. Here we visited heaps of mines Johan, Reiner and Dolní Ladislav with nice samples of pseudomalachite and libethenite. Then we moved to Špania Dolina, famous by its historical mining of Fe and Cu ores from deposit Piesky which is also formed by permian meta-sediments affected by tertiary volcanic processes with mesozoic carbonate rocks around. We were collecting here some samples of azurite and malachite.

sfalerite in quartz vein

Third day our interest was moved to locality Farbiště near Ponická Lehôtka where we can find triassic carbonates penetrated by triassic andezites and ryolites. From primary tennantite and chalkopyrite grew up big amount of secondary minerals. Next we looked at Banská Belá where we were looking for some nice quartz varieties from mesozoic quartzites.

At the last day of excursion we divided into two groups. First group visited active gold mine Rozália and second group visited the heap of this mine. Deposit is evolved in volcanics of Štiavnica stratovolcano (mainly andesites). Before gold there was mined Cu, Pb and Zn. Gold with base metal mineralization is contained in brecciated and/or banded quartz veins.

23 members of our Chapter participated on this excursion which was led by Chapter president Ondřej Krátký.

For more photos click here.

In June 2016, five members of our SGA chapter took part in The 8th Siberian Early Career GeoScientists Conference in Novosibirsk, Russia. We have presented there our work and we all have participated in field trips to Altai mountains. It was great opportunity for us to discuss our thesis, observe work in different institutions and also learn geology in the field.

This trip would not be possible without the financial support of the SGA organization.

For more photos click here.

On the 21st of May SGA Student Chapter Prague organized excursion to the historical gold mine located within the gold-bearing district Jílové Belt (located near Prague). We have visited historical adit Václav which led us directly to the Pepř mine. In this adit we had a chance to observe quartz stockworks with a little amounts of gold. During the mine visit we were able to collect some samples of gold-bearing quartz and also samples of scheelite mineralization from the Tobola vein. Some lucky students have even samples with small flakes of gold.

After the mine visit we have spent some time at the Museum of gold located at the city Jílové u Prahy.
Whole excursion was led by Dr. Pavel Škácha.

At the end of April, students from the SGA Student Chapter Prague prepared excursion to the Bohemian Massif for students from the SGA Baltic Chapter. During this trip, we had a chance to visit Mokrsko gold deposit located at the Jílové belt, former silver/uranium mine Svornost at Jáchymov city and several localities of greisen and skarn mineralization at the Erzgebirge Mts. This four-day field trip was a great opportunity to exchange ideas and make connections between our two SGA Student Chapters.

SGA News No 39 page 22

Thanks to cooperation with the Moroccan Chapter we organized international field trip to important Morocco bearings, participated by members of Prague Chapter and Moroccan Chapter in 13th to 21th March,2016 . Five czech members flew to Marrakech and visited some interesting deposits in High Atlas area (6th-13th) before the common program with our Moroccan colleagues.

Mibladen area

Bou Azzer

Our program started with visiting Mibladen, area with galena mines and world-famous crystals of vanadinates. Then we explored also Taouz (Pb veins), Imilchil (pegmatites) and Imini (Mn ore). Poor vegetation on numerous large outcrops gave us great opportunity to study geology even from car.

In 13th March we met with Mococcan SGA chapter in Agdz and next day we looked at the Bou Azzer mining district and ophiolitic suture zone (Pan-African mineralization of the Anti-Atlas belt (Co-Ni-As) with nice samples of skutterudite).

pyrhotine in shale (Draa Sfar)

In following days our interests were heading to variscan central Jebilet Massif with visiting Draa Sfar Mine (VMS polymetallic ore deposits), the Kettara district (VMS and SEDEX) and the BirN’Has deposit (base metal veins in metapelites and carbonates). Thanks to MANAGEM mining company, we could visit their underground mines.

Kettara

Then a Meeting took place at the Faculty of Sciences Semlalia, Marrakech. Prof. Omar Saddiqi (Hassan II University, Casablanca) was talking about the Geology of Morroco. Mr. Mustapha Chaib (ONHYM mining company, Rabat) have been presenting about the Moroccan mining potential. And Mr. Jan Bubal (Prague Chapter) had presentation about the Geology of Czech Republic.

Next field visit was directed to the Azegour Skarn deposit and surrounding areas (Mo, W, Cu deposits; western High Atlas). And the last day we visited Benguérir phosphate deposit (Cretaceous/Tertiary) with OCP mining company.

outcrops everywhere

SGA News No 39 page 1

For more photos click here.

Last excursion of the 2015 (7th-8th November) led us to German city Freiberg, where we visited the historical shaft (Pb-Zn-Ag vein type mineralization) and the Terra Mineralia exposition with world famous mineral samples.

Pavel with Pb-Zn-Ag vein mineralization

On the second day it led us to Antonsthal ore heap (skarn) and localities in the field on the Czech side of the borders: Loučná (pyroclastics with large pseudoleucite crystals) and Ahníkov (lateritized ultramafic body with veinlets of pink and violet chalcedony).

Ahníkov

This two-day excursion provided interesting insight into geology and history of mining at the Saxony and it was a chance as well to visit one of the best mineral collection in the World. This excursion was attended by 22 Chapter members.

SGA News No 39 page 18  
For more photos click here.