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The uranium mining undertaken by SDAG/SAG Wismut was larger in terms of both scope and impact than all previous mining activities in the Erzgebirge. With the creation of large contaminated waste heaps, the initially reckless and thoughtless exploitation of resources changed the landscape of the western Erzgebirge more 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 legacy of uranium mining in this area.