A solution to potential shortages of two critical minerals used in making semiconductors and advanced military equipment — exports of which were restricted by China this month — may be lying in some waste storage ponds in central Tennessee.
Owners of a zinc processing facility in the southern U.S. state say they are developing a plan to extract the two minerals — gallium and germanium — from the ponds where for years the company has deposited the residue from its refining of zinc from five mines located in central and eastern Tennessee.