Right in the middle of the Golden Twenties, a new player stepped onto the field in the coal and steel industry: the major group VSt. The abbreviation stood for Vereinigte Stahlwerke AG. The company consisted of a merger between various companies in the coal and steel industry and their shareholders included important companies. This comprised the Thyssen Group. Vestag, as people also called the Group, took over Hansa mine and expanded it into a large-scale pit. The persons in charge also converted the former weather shaft 3 into a new main winding shaft.

In 1929, a tragic event took place. VSt’s construction director, the architect Hellmuth von Stegmann und Stein, unexpectedly passed away at the age of just 37. The Group had to find a new specialist. For drafts of the over-ground facilities of the new main winding shaft, the association of architects Fritz Schupp (1896 - 1974) and Martin Kremmer (1894 - 1945) was selected. Both were considered as key representatives of new building. For example, they designed the pit of Zollverein mine 12, which has belonged to the UNESCO world cultural heritage since 2001.

Demolition work got under way in 1983. Three years later, most of the over-ground facilities had disappeared. But their stories remain unforgotten. The plant has therefore been on the City of Dortmund’s list of monuments since 2006.

As an important location of the integrated economy of the Dortmund coal and steel industry, Hansa mine belongs to the Foundation for the Preservation of Industrial Monuments, which safeguarded the monument against demolition by taking over its ownership in 2015. It was a key member in the production association of mining, coking and smelting works, and is an enlightening relic of the industrial era. The Foundation is working on concepts for tours on-site, with which they want to convey the integrated economy’s relationships in a descriptive way in the future. In the process, visitors should get insights into the hoisting machine building and the electrical hoisting machine that is kept inside. Originally constructed in a steel framework, the hoisting machine building was destroyed in a hail of bombs in the Second World War, and was rebuilt in original cubage in the years 1946/47. With one difference: The master builders opted for massive construction for the reconstruction.