Search U.S. government technical reports digitized or harvested by TRAIL.
Mining methods of the Rosiclare Lead & Fluospar Mining Co., Rosiclare, Illinois
Milling methods and costs at the Hillside Fluorspar mines, Rosiclare, Ill.
Progress reports :metallurgical division.
Methods and costs of mining fluorspar from a flat-bedded deposit at Cave-In-Rock, Ill.