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Sigmundshall – Wunstorf

The Sigmundshall works of K+S KALI GmbH is located in the Hanover region, and is Nether Saxony’s last active potash producing mine. It is situated approximately 25 kilometres northwest of Hanover and about 5 kilometres to the south of the Steinhuder Meer, near Wunstorf. A characteristic feature of the Sigmundshall mine is the steep angle of its salt seams, requiring special extraction methods. The range of products includes potassium and magnesium containing fertilisers, but also straight potassium chloride, which is processed from the crude salt into products for industrial applications (such as electrolysis). From Sigmundshall, these products are shipped worldwide by rail, road and inland waterways.

Photographs of the Sigmundshall site

A partner to the region

With approximately 770 employees above ground, among them nearly 45 apprentices and trainees, the Sigmundshall works is one of the most important regional employers. Potassium and magnesium production significantly contributes to the region’s economy. This facility regularly award contracts to regional sub-contactors and service providers, thereby creating an economic base for a large number of regional jobs. The site is also committed to supporting social institutions, associations and clubs.


2001 Kieserite production starts
1997 Mining depth of 1,400 metres is reached
1965 The Kolenfeld shaft is sunk to a level of 940 metres
1963 Implementation of trackless conveyor technology
1949 Re-commissioning of crude salt extraction
1933 Shut-down of operation
1923 Abandonment of the Weser mine
1913 The Weser shaft is completed
1906 Beginning of excavation of the Weser shaft
1906 Plant is taken into operation
1898 Beginning of excavation activities


DIN EN ISO 9001ff. certificate Sigmundshall (pdf)

GMP+ certificate Sigmundshall (pdf)

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