St. Joe Minerals Corporation was an American mining company. It was the United States' largest producer of lead and zinc at the time of its merger with Fluor Corporation in 1981. The St. Joseph Lead Company was founded on March 25, 1864, by Lyman W. Gilbert, John E. Wylie, Edmund I. Wade, Wilmot Williams, James L. Dunham and James L. Hathaway in New York City.