Casteel Mine - G.S.A. November 1989 Meeting - St. Louis, Mo.
The Magmont-West mine area is located in southeastern Missouri approximately 90 miles southwest of St. Louis along the western edge of the Viburnum Trend or New Lead Belt.
During a Precambrian copper-iron exploration program which was begun in 1956 by American Zinc Company, lead-zinc mineralization was encountered in the Upper Cambrian Bonneterre Formation. Subsequent to a 1973 evaluation, which showed that the Precambrian copper-iron mineralization delineated in the West Dome area was uneconomical, emphasis was shifted to exploring for Pb-Zn mineralization in the Bonneterre Formation in the southeastern and south-central portion of the project area.