In both its scope and its impact, the uranium mining carried out by SDAG/SAG Wismut exceeded all previous mining activities in the Erzgebirge. With the creation of large, contaminated waste heaps, the initially rampant and thoughtless exploitation of the resources available changed the landscape of the western Erzgebirge to a greater extent than ever before. After German reunification and the closure of the uranium mines in 1990, the company known today as Wismut GmbH became (and continues to be) responsible for cleaning up the aftermath of the uranium mining period in this area.