Past Lectures 2019

The ‘Freiberg Colloquium’ is a series of lectures of the Saxon State Office for Environment, Agriculture and Geology, of the Saxon Mining Authority, of the Geokompetenzzentrum Freiberg. e.V., of the Saxon State Archives/Mining Archives, of the Technical University of Freiberg and of the terra mineralia.

Thursday, 17 January 2019, 7:30 pm

An awakening volcano in the Vogtland / Bohemia? - Findings, open questions and consequences.

Between Marienbad and Leipzig / Halle it quivers almost constantly at depths of about 20 to 6 km. Since the magnitudes are usually below 1.5, this is not noticeable to humans. In the last 30 years, medium-sized swarms between magnitude 3 and 4 have repeatedly appeared in the southern Vogtland and in northwestern Bohemia, which are the reason for the constant interest of the population. The lecture deals with the origin of CO2-dominated gases, recent hidden magma activity, earthquake activity as well as quaternary volcanism in Western Saxony and parts of West Bohemia and Northeastern Bavaria. Time series studies using helium isotope on gases from mineral springs and mofettes revealed anomalies in the spring of 2000 and 2006 that were considered concealed, i. non-terrestrial magma intrusions were interpreted. At Mytina / CZ and Neualbenreuth / D, unknown volcanoes (Maare) Quaternary (Middle Pleistocene) ages were discovered in 2007 and 2015. To what extent does this fit together? Will the region threaten volcanic eruptions in the future? Which open questions are asked by science and which research approaches and methods should they be processed in the future and solved (<>)? What contribution in collaboration with researchers could the media and politics make in the future?

Dr. Horst Kämpf is a geologist and has studied and earned his doctorate at the TU Bergakademie Freiberg.

Dr. Horst Kämpf, Deutsches GeoForschungsZentrum Potsdam
170. Freiberg Colloquium, new venue: Senate hall of the TU Bergakademie Freiberg, Akademiestrasse 6.

Thursday, February 14, 2019, 19:30

"The precious and non-ferrous metal mining in Meissen-Saxon
Ore Mountains 1350 -1470"

Dr. Ivonne Burghardt
171st Freiberg Colloquium, lecture hall at terra mineralia, Freudenstein Castle.

Anyone who takes a closer look at the Late Middle Ages will quickly gain the impression that this age was dominated by crisis events. Current research shows that this assessment does not apply to all areas of economic and cultural development, but previous studies in the mining industry indicate that in the course of the 14th century there was also a significant decline in precious metal extraction in all major Central European mining regions. The mining area near Freiberg was no exception. The exact time of the decline in mining activities, the reasons for this and the far-reaching consequences for the overall economic development of the region were examined by the speaker in the context of a dissertation. The results of this study will be presented in a lecture at the Freiberg Colloquium.

Account of the Freiberger Mint Master Augustinus of Florence for the period from 18 July 1366 to 23 April 1368 © Hauptstaatsarchiv Dresden, 10004 Kopiale, No. 5, p. 42r

Thursday, March 7, 2019, 19:30

"100 Years of the Reiche-Zeche Teaching and Visiting Mine"

Prof. Dr. Helmut Mischo, TU Bergakademie Freiberg
172. Freiberg Colloquium, lecture hall at terra mineralia, Freudenstein Castle.

In 2019 the "Research and Apprenticeship Mine" of the TU Bergakademie Freiberg celebrates its 100th anniversary. Today it operates and maintains the "Reiche Zeche" and "Alte Elisabeth" mines, an active mine with a total depth of 230 m and an area of over 4 km². Both plants belong to the core of the former "Himmelfahrt Fundgrube", famous for its silver wealth.

With more than 30 underground test laboratories, the mine is a teaching and research facility that is unique within the German and European university landscape. The mine is used by almost 50 research institutions and companies from all over Europe for spectacular research projects as well as for a variety of training programmes. Examples include the world's largest civilian blasting chamber and the underground test rig of the Biohydrometallurgical Centre. In addition to its use in research and teaching, the mine is also open to tourists under the "Silver mine" label. What was only a "by-product" in the beginning, is now very popular with guests and was professionalised in the early 90s with the founding of a support association.

In the lecture by Prof. Dr. Helmut Mischo, Scientific Director of the Research and Training Mine, you can look forward to an exciting report on the eventful history of this venerable institution and find out which topics scientists are working on today, how students are trained and at the same time tourists explore the traces of the ancestors.

Thursday, April 4, 2019, 19:30

"Slate as a mirror of the collision of continents -
A contribution to the rock of the year 2019"

Mario Baum, Geobüro Mario Baum, Wurzbach
173. Freiberg Colloquium, new venue: Senate Hall of the TU Bergakademie Freiberg, Akademiestrasse 6.

Slate is rock of the year 2019 and can reflect processes that are closely connected with plate tectonics like hardly any other rock.  As if time and movement were frozen, one can follow the development of the slate, which began in the depths of the oceans as a sediment deposit and could end as the highest peak of a folded mountain range. Layering, folding, schistosity and fracture tectonics are geological elements that interested and attentive visitors can discover in the middle of Germany in various outcrops, large and small.

This rock, after which mountains were named in Germany, was and is at the same time the source of numerous deposits of ore raw materials and industrial minerals. Roofing slate has been mined here since Roman times and is still mined today. Castles, churches and whole villages are covered with roofing slate and give buildings and regions their own charm.

Thursday, May 9, 2019, 19:30

What knowledge do organic trace substances provide in groundwater?

Prof. Dr. Traugott Scheytt, Chair of Hydrogeology and Hydrochemistry, TU Bergakademie Freiberg
174th Freiberg Colloquium, new venue: Senate Hall of the TU Bergakademie Freiberg, Akademiestrasse 6.

A large part of the world's population covers its water needs with groundwater from karst aquifers, which represent an important global groundwater resource. A special feature of karst aquifers is the development of extensive underground drainage systems through the process of karstification. Due to high flow velocities in karst pipes and preferential flow paths, karst aquifers are particularly susceptible to pollutants. Through the use and intake of pharmaceuticals, sweeteners and stimulants, these organic substances get into the wastewater and can be discharged into the groundwater. In addition there are pesticides and veterinary pharmaceuticals from agriculture which can also be discharged into the groundwater. Such trace substances are undesirable in groundwater and drinking water, but at the same time they can be used to provide valuable information about the origin of groundwater, its input and residence times. In addition, trace substances can make a valuable contribution to the current discussion on the influence of agricultural use on the quality of groundwater in comparison to the input from wastewater.

Green coloration after a tracer test on the Swabian Alb; Photo: Paul Knöll

Thursday, 20 June 2019, 19:30

"In memoriam dr. Heinrich Douffet (1934 – 2017) -
Freiberg honorary citizen, city councilor and geologist"

Prof. Dr. Steffen Wagner, dr. Harald Walter & dr. Volker Benedix
175th Freiberg Colloquium, new venue: Senate Hall of the TU Bergakademie Freiberg, Akademiestrasse 6.

Our honorary citizen, Dr. Heinrich Douffet, would have turned 85 on 25 May 2019. In his honour, there will be a "Freiberger Colloquium" on 20 June 2019 at 19.30 in the Senate Hall of the TU Bergakademie Freiberg. Heinrich Douffet passed his high school diploma in Freiberg at the secondary school "Geschwister Scholl" and then studied geology at the TU Bergakademie Freiberg.

After 25 years in the Geological Service, later VEB Geological Research and Exploration, he moved to the District Art Centre Karl-Marx-Stadt in 1983. In 1990 he was a member of the last democratically legitimated People's Chamber of the GDR and took over the Museums / Monument Preservation Department of the Saxon Ministry of Science and Art. Dr. Heinrich Douffet was a CDU member of the city council from 1994 to 2004 and a member of the district parliament from 1989 to 1994. In 1999 he finished his active professional activity. Already as a teenager he showed interest in culture and history. As a ground monument conservator and representative for the preservation of monuments of the city of Freiberg and the district of Freiberg, he fought tirelessly for the preservation not only of our old town. In 1982 he received the town honour plaque in silver and in 1986 the architecture prize of the district, in 2004 the Andreas-Möller history prize and in 2005 the citizens prize of the town of Freiberg. Dr. Heinrich Douffet became an honorary member of the Freiberger Altertumsverein in 2014 and an honorary citizen of the city of Freiberg in 2017.

He was one of the initiators for the intended inclusion of the Montan region Erzgebirge in the UNESCO list of the world cultural heritage, for which he stood up until his death. A close connection existed to the city and mining museum, to the city archive Freiberg and to the TU Bergakademie Freiberg as a member of the Association of Friends and Supporters of the TU Bergakadamie Freiberg. Dr. Heinrich Douffet has shared his knowledge in more than 100 book and magazine publications. His donations to museums and associations as well as his extensive legacy contribute to preserve valuable cultural assets for the future. The speakers St. Wagner, H. Walther and V. Benedix would like to outline his life in the colloquium and pay tribute to Dr. Heinrich Douffet as a geologist and monument conservator who holds a doctorate. Thanks go in advance to those who supported them. (Prof. Dr. rer. nat. habil. Steffen Wagner).

Thursday, 5 September 2019, 19:30

"The rehabilitation of the Rothschönberger Stolln - what's next?"

Tobias Dressler, Department Manager Underground Mining SächsOBA
176th Freiberg Colloquium, lecture hall at terra mineralia, Freudenstein Castle.

The Rothschönberger Stolln (tunnel) is one of the best known and most important water solving galleries in Saxony. Even today, water-soluble tunnels still drain large underground mountain areas and thus fulfil an important function in maintaining safe and stable conditions at the surface. The Rothschönberger Stolln performs this function for the Halsbrücker, Freiberger, Brand-Erbisdorf and other smaller areas.

Maintaining the functionality of the water solution galleries is a fundamental task of the Free State of Saxony if there are no mining companies or their legal successors. In Saxony, the Saxon Upper Mining Authority performs this task within the framework of its competence as a special police authority for old mines. Since the flood of August 2002, the state government has intensified its efforts to maintain the functionality of the important water solution galleries. Since then the Saxon Upper Mining Authority has also had rehabilitation work carried out on the Rothschönberger Stolln and its entrances at various points and is planning such work for the future.

Mr. Tobias Dressler, head of the underground mining department in the Saxon Upper Mining Authority, will present the current status of the rehabilitation of the Rothschönberger Stolln. In addition, he gives a brief overview of the classification of the task in the Saxon Upper Mining Authority, the structuring of the topic in the area of old mining and the actual rehabilitation work itself.

Thursday, 26 September 2019, 19:30

"The Tellerhäuser pilot project: New processing attempts for domestic
complex ores in a big way"

Prof. Karl Gerald van den Boogaart, Head of Modeling and Evaluation,
Helmholtz Institute Freiberg for Resource Technology
177th Freiberg Colloquium, lecture hall at terra mineralia, Freudenstein Castle

A long tradition could revive in the ore mountains - ore mining. In cooperation with European colleagues, Freiberg raw material experts have shown for the first time in practice that complex ores from Saxony can be processed - in an energy-efficient, environmentally friendly and economical way. Thanks to modern raw material analyses, sensor-based sorting, the use of computer-aided process models and the development of new processing methods for the finest particles, it was possible to enrich several metal-containing minerals at the same time. The minerals concerned are tin, zinc, iron, copper and indium, which are extremely finely distributed in the domestic complex ores and could not be processed until now. At the 177th Freiberg Colloquium, Prof. van den Boogaart explains the strategy used by the scientists to tackle ore.

The r4 project "Preparation of fine-grained polymetallic native complex ores (AFK)", funded by the BMBF, and the European Horizon2020 project "Flexible and Mobile Economic Processing Technologies (FAME)" were jointly carried out. Especially the close cooperation with the local industrial partners Saxore Bergbau GmbH and UVR-FIA GmbH made the practical tests possible, but also the cooperation with the visitor mine Zinnkammern Pöhla e.V., where the complex ore was mined.

Thursday, 28 November 2019, 19:30

"Challenges to the phasing out of the brown coal mining in Saxony"

Mr. Christof Voigt, head of the opencast mining department, Saxon Upper Mining Authority
178th Freiberg Colloquium, lecture hall at terra mineralia, Freudenstein Castle

Photo: Christof Voigt, Head of the Opencast Mining Department, Saxon Upper Mining Authority,
Photographer Thomas Kruse, Photographisches Freiberg

Since German reunification and a radical structural change, the extensive legacy of the abandoned brown coal mining in the GDR has been restored to this day with the help of federal and state finances. At present, three Saxon opencast mines, Vereinigtes Schleenhain, Nochten and Reichwalde, are still mining brown coal for power generation. According to the district concepts of the two mining companies MIBRAG and LEAG, brown coal extraction in the Free State of Saxony would thus be completed by the mid-2040s without any influence on the part of the government.

Since January 2019, the Commission "Growth, Structural Change and Employment" appointed by the Federal Government has recommended 2038 as the final and phase-out date for coal-fired power generation. The government is currently working on implementing this recommendation by enacting the relevant laws. Thus, in the target triangle of secure energy supply, structural development of the brown coal regions and limitation of the consequences of long-term climate change, the path towards a premature end to brown coal extraction is also mapped out in the Free State of Saxony.

As the competent authority for the approval and monitoring of opencast brown coal mines by the mining authorities, the Saxon Upper Mining Authority is primarily concerned with the approval processes for the operational plans of brown coal companies to be changed in the course of a premature coal withdrawal, as well as securing the reutilisation of the areas used for mining purposes after the coal extraction has been completed.

Mr. Christof Voigt, head of the opencast mining department, is responsible for the processes in the Saxon brown coal mining in the Saxon Upper Mining Authority and will speak on the developments, current status and upcoming challenges of brown coal mining in the Free State of Saxony at the Freiberg Colloquium.

View of the opencast mine Nochten from the observation tower at Weißwasser, Photo: Julian Nyca,