Located in Southeastern Idaho near the community of Malad City, Hess Pumice Products is a mining & processing operation specializing in the extraction and refining of the world’s purest commercial deposit of white pumice. In continual operation since 1958, we’re the largest producer of processed pumice on the planet. Why? The quality of our deposit, our “On Spec—On Time” promise, and a dedication to the highest standards of quality control. Pumice Products for Industry: Pozzolan, Lightweight Concrete Aggregate, Soil Conditioning, Filtration, Fillers and Extenders, Gentle Abrasives and more.