Today, the smallest esco mine is a straight-out rock salt mine. That wasn't always the case: At the beginning, potassium salt for fertilisers was also produced there.
Today's rock salt production is carried out with miners' drill-and-blast work in the so-called bench excavation method. With this process, three stopes, each up to 40 meters high, are stacked on top of each other and the salt is blasted off in lateral slices (benches). The stopes, which can be up to 100 metres long and 20 meters wide are supported horizontally and vertically by layers of grown halite, so-called pillars, so that they are permanently stable.
The shafts Braunschweig-Lüneburg I to III establish the connection between the mine and the production and supply facilities at the surface. They reach to a depth of up to 560 meters and allow the miners to enter and leave the pit, salt extraction as well as supply with fresh air and operating supplies. All necessary facilities to guarantee trouble-free operation are available underground: Workshops, spare parts stores, transformer substations and other supply facilities. With an approximately 60 kilometre long network of driving routes, the underground work has the road network of a medium-sized town.
After an initial processing step underground, the coarsely broken rock salt is transported to the surface and there undergoes further grinding and sieving steps. At the end we have high quality, pure rock salt products in various grain sizes which are ideal for the respective purpose.
The product and service portfolio of esco Werk Braunschweig-Lüneburg:
- De-icing salt
- Salt for chemical use (electrolysis salt)
- Feed salt
- Lick stones
- Food-grade salt and table salt
- Industrial salt