Which units were south of the city of Saalfeld Thuringia in April 45 and searched the slate mines there?

In April 1945, units of the U.S. Army, specifically elements of the 3rd Armored Division, were south of Saalfeld, Thuringia. They were involved in searching the slate mines in the area, which were believed to be potential hiding places for German forces or valuable resources. The region was a strategic location as Allied forces advanced into Germany towards the end of World War II.