The Mineral King Development records consist of two boxes of files and ephemera pertaining to the controversial proposed development of the Mineral King valley by Disney Enterprises, Inc. The files were kept by activists Dr. Richard and Jean Koch, chiefly the latter. Nearly a third of the collection is comprised of correspondence, mostly between the Koches and government or media entities. The remainder of the collection consists of articles, testimonies, clippings, news releases, environmental impact reports, etc. concerning the lengthy battle over the status of Mineral King.