Marie Shaft

To dispose of the final lye, a composite pipeline was built up to the Elbe, to which the neighboring plants Ummendorf-Eilsleben, Walbeck (Gerhard) and Braunschweig-Lüneburg also connected later. In 1900 the Burbach union joined the German Kalisyndikat. The sales quota in 1905 was 34.59 thousandths. Due to the explosive increase in the production of potash mines in the German Reich, the participation in the syndicate in 1910 was only 14.76 thousandths.
After the completion of the Bartensleben shaft in 1912, Marie only served as an escape and weather shaft. From 1937 the mine was leased to the Air Force for the production and storage of flak ammunition. For use as a U-relocation bulldog from 1944 onwards, shaft Marie received a new electrical access device with a lower conveyor scaffold instead of the previous steam conveyor, which is still used today.

From 1897 to 1899, the Burbach trade union brought down a shaft that Korte named after his wife Marie. The clayey overburden was intersected with water inflows without difficulty and the salt mountains were approached at a depth of around 300 meters. The Marie shaft had a final depth of 520 meters and a diameter of 5.25 meters. It was built with two and a half stone clinker masonry, which was not necessary for the watertight segmental lining that is otherwise common in potash wells. Filler places were created at depths of 310 and 360 meters. Boiler and machine houses, a steel conveyor scaffold and the shaft hall, which is still preserved today, were built over days.
Scheduled potash mining began on August 31, 1898. The raw salts were processed in a leased factory in Schönebeck (Elbe) until 1902, when a separate factory was completed in Beendorf.

From 1959 to 1984, an underground chicken fattening was operated in the former mining chambers near the Marie shaft. By turning the lights on and off in a targeted manner, the poultry were faked to have an hour shorter day, which made the animals grow faster.
Subsequently, from 1987 to 1996, 6445 tons of toxic, cyanide-containing hardening ice salts were stored underground. Because of the prohibition of storing nuclear and conventional hazardous waste under German law, this waste was retrieved after 1990 and taken to the Herfa-Neurode underground landfill.
Today the Marie mine belongs to the Morsleben repository.Source:
de.m.wikipedia.org/wiki/Kali-_und_Steinsalzwerk_Bartensleben#Schachtanlage_Marie