Glückauf-Sarstedt potash works
| Glückauf-Sarstedt potash works | |||
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| General information about the mine | |||
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| Rare minerals | Hard salt ( rock salt , sylvin , kieserite ) | ||
| Information about the mining company | |||
| Operating company | Kali Chemie AG / Friedrichshall Group | ||
| Start of operation | 1904 | ||
| End of operation | 1925 | ||
| Successor use | Reserve plant | ||
| Funded raw materials | |||
| Degradation of | Potash salt | ||
| Mightiness | 52 m | ||
| Greatest depth | 750 m | ||
| Mightiness | 5 m | ||
| Raw material content | 18.6% | ||
| Geographical location | |||
| Coordinates | 52 ° 13 '15 " N , 9 ° 50' 51" E | ||
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| Location | Glückaufstrasse, 31157 Sarstedt | ||
| local community | Sarstedt | ||
| District ( NUTS3 ) | Hildesheim | ||
| country | State of Lower Saxony | ||
| Country | Germany | ||
| District | Northern Hanover Potash District | ||
The disused potash plant Glückauf Sarstedt promoted potassium salts from the northwestern part of the salt dome of Sarstedt . After its closure in 1925, it was kept in an eligible condition as a reserve mine for over 60 years. Dr. Rainer Slotta from the German Mining Museum classified the day facilities as an outstanding industrial monument . Nevertheless, all facilities and buildings were demolished in the summer of 1987.
geology
The formation of the Sarstedt salt dome
The Sarstedt salt dome is one of around 200 known deposits of this type in northern Germany. The salt layers from which this was created formed at the time of the Zechstein around 260 million years ago, when sea water evaporated in a shallow basin. The salt layers were later covered by further deposits and are now at a depth of around 3000 m. From a weak zone in the basement, the salts pierced the slopes of the red sandstone (→ halokinesis ). The salt in the upper part of the salt dome was dissolved and washed away by the groundwater . Hardly soluble anhydrite and clay remained. These formed the so-called gypsum hat over the actual salt deposit.
Geographical location and extent
The salt level of the Sarstedt salt dome, i.e. the upper limit, is between 120 and 150 meters deep. The salt dome extends in an area between the villages of Hasede , Groß Förste , Giesen , Ahrbergen , Sarstedt , Giften , Barnten , Rössing and Emmerke . It used to be assumed that the salt dome continued from Sarstedt to Lehrte near Hanover ( Sarstedt-Sehnde salt dome ). During investigations in the northern area, however, only red sandstone was found, so that there is probably no connection with the deposits of the Friedrichshall and Bergmannssegen-Hugo potash works, among others .
mineralogy
The mass of the salt dome consisted of rock salt . Both sylvinite with about 28 to 35% KCl and hard salt with an average of 18.6% KCl were degraded.
History and technology
Revelation story
The mining company Glückauf-Sarstedt was founded on June 4th, 1903. At the head of the company were mining engineer Karl Ermisch as managing director and director Theodor Feise as authorized signatory . Both people were connected to the Friedrichshall potash plant in Sehnde . The company had 1.57 square kilometers of Berechtsamen in the districts Sarstedt and poisons including two plots for the construction of future mines. In 1904 Kaliwerke Friedrichshall AG took over all shares in Glückauf-Sarstedt. In order to raise additional capital, the Kaliwerke Sarstedt Aktiengesellschaft was founded in 1905, based in Berlin . In addition to Friedrichshall, Deutsche Bank and the Schlesische Bankverein became shareholders . Dr. Carl Wilhelm Schmidt and director Oskar Klauss from Berlin. The latter was also active in the neighboring Rössing-Barnten potash drilling company .
A total of five deep boreholes were drilled to explore the deposit . The rock salt was found at depths between 122 and 129 meters, several potash stores were between 129 and 655 meters deep. The thickness varied between 3 and 49 meters. Among the potash deposits were sylvins 12 meters thick and hard salts 44 meters thick.
Glückauf-Sarstedt mine
Due to the satisfactory drilling results, it was decided to build the shaft . The first work began on December 28, 1904. The 4.98-meter-wide shaft was sunk at the point of borehole V by the company Haniel & Lueg from Düsseldorf using the Kind-Chaudron method as far as the salt dome. Glückauf-Sarstedt was the last shaft in Germany to be drilled using this drilling method. On November 5, 1907, the shaft was standing 172 meters in rock salt and the cast iron tubbings could be installed. The further sinking was carried out independently and in mid-January 1909 the planned final depth of 750 meters was reached. After completion of the shaft extension , the filling points and levels were excavated at 700 and 750 meters . The applied crosscuts opened up the hard salt deposit and the sylvinite deposit with an average thickness of 4 to 5 meters each. The daytime facilities consisted of a winding tower with a mine ventilator building , raw salt mill, salt shed, kaue, boiler house and power station, workshops and an administration building. A 2.3 km long siding to Sarstedt had already been laid in 1906.
The scheduled mining of potash began in June 1909, and by October 9,400 tons of kainite and 900 tons of 20% potash fertilizer salt had been shipped. After a temporary recognition in April 1909, the potash plant Glückauf Sarstedt joined the on May 7, 1910 German Kalisyndikat at. The participation was 1.4%.
The plan to build our own potassium chlorine factory was rejected because there was no way of discharging the salt wastewater produced there. The planned second shaft in Giften was also not implemented, as there was insufficient financial means. However, in order to meet the demands of mining law for a second mobile exit, a contract was concluded with the neighboring Fürstenhall mine. The breakthrough took place on the newly prepared 550 m level.
The shares in the Sarstedt mining company came into the possession of the Neu-Staßfurt I and II trade unions in a transaction in 1912 . After its merger with the Friedrichshall potash works, the shares flowed into the total assets. After the end of the First World War and at the beginning of the 1920s, sales of unprocessed potash salts collapsed. At the end of 1923 only 40 miners were employed. After a brief economic improvement in 1924, the decision was made in 1925 to cease operations of the potash plant, as the share in the German Potash Indicator was not sufficient for economic operation. The funding quotas were credited to the Ronnenberg and Friedrichshall plants.
After the shutdown
After the official cessation of production, the potash plant was kept open and should serve as a reserve plant for Friedrichshall and Ronnenberg. The systems were kept in working order. Until 1970, depending on the economic situation, rock salt was temporarily extracted and processed in the Egestorfshall salt works in Hanover-Badenstedt . From 1954 on, some potash was occasionally extracted, which was brought to the Ronnenberg factory for further processing. During this time, Glückauf-Sarstedt retained its appearance from before the First World War.
The Kali + Salz AG bought the mine in 1981 from the Kali Chemie to expand its potash Siegfried-Giesen. From the Siegfried mine in 1983 a connection on the 750 m level was driven. However , there was no resumption of mining in the Glückauf field, since the production in Giesen was stopped in 1987. In the same year the entire pit area was cleared. The shaft itself is still open today (2011) and belongs to the Siegfried-Giesen reserve mine.
The feasibility study on the restarting of the Siegfried-Giesen potash plant, which has been ongoing since the beginning of 2011, could, if the decision was positive, also lead to a new active use of the Glückauf-Sarstedt shaft.
The headframe
The winding tower of the Glückauf-Sarstedt mine, erected in 1909/10, was one of the first tower winding systems in Germany and the only example of a hammerhead tower in potash and rock salt mining. The hoisting machine was not, as usual, in a separate building next to the shaft, with the ropes being diverted from the horizontal into the shaft via a sheave frame, but in a machine house on a tower-like support structure made of steel above the shaft. The construction was based on Shaft I of the Germany mine in Świętochłowice ( Upper Silesia ). A tower extraction was usually chosen when a shaft was sunk on the site of an existing mine and there was a lack of space. In Sarstedt, the project was justified with the least possible interruption in funding during the construction period, which actually only lasted eleven days. Also remarkable was the mounting of the supports on hydraulic cylinders , with which the vertical position could be compensated at any time. Unfortunately, the headframe was closed in August 1987. A hydraulic cylinder for the tower supports is on display in the German Mining Museum as a reminder of this rare and early construction.
Current condition (2011)
The former colliery site is located on the southern edge of Sarstedt on Glückaufstrasse . There are no more recognizable remains. The covered shaft is inside a fence.
In Sarstedt there are still some houses belonging to the miners' colony, z. B. in the Glückaufstraße and in the Giesener Straße .
literature
- Rainer Slotta : Technical monuments in the Federal Republic of Germany - Volume 3: The potash and rock salt industry . German Mining Museum, Bochum 1980, p. 560-571 .
Individual evidence
- ↑ Slotta: Technical Monuments in the Federal Republic of Germany, Volume 3 . 1980, pp. 564-568
