HESS PERLITE mines, expands and processes frothy white perlite for industrial use in a wide range of applications—including horticultural, insulative, construction, filtration, fireproofing, and agricultural applications. The mine is located in Southeastern Idaho approximately 27 miles Northwest of the processing plant in Malad. Although the mine has been in operation since 1965, there are still over 10 million tons of perlite reserves remaining, all on …