The Grasselli Chemicals Department of the E.I. du Pont de Nemours & Company was responsible for the manufacture of ammonia, inorganic heavy chemicals, zinc smelting, and plating products, tanning chemicals, insecticides, and wood preservatives. The records are limited to a single file on the Grasselli zinc mine near New Market, Tennessee, and contain copies of the lease, maps, geologist's reports, and correspondence on the output of the mine.

Thomas Ellwood Gillingham, Jr. (1912-2004) was a geologist, he worked as an independet consultant and for the Atomic Energy Commission and the W.R. Grace & Company. The collection documents Gillingham's career as a geological consultant. The collection is arranged into six series: W.R. Grace & Co.; Uranium Mining; Phosphate Mining; Reports; Education; and Reference cards.