TETRA Technologies Inc. has announced plans to form a joint venture with Magrathea Metals, Inc., a company specializing in innovative technologies for producing magnesium from seawater and brines. The partnership aims to rebuild the U.S. magnesium metal defense industrial base at TETRA's Evergreen Project in Southwest Arkansas. The collaboration will incorporate Magrathea's electrolytic magnesium technology into TETRA's operations, supporting both companies' goals to develop a secure domestic supply of critical minerals such as magnesium and lithium. The Evergreen Project is also set to produce significant amounts of bromine, with operations expected to begin by the end of 2027. Magrathea has already secured Defense Production Act Title III funding for its initial commercial phase at the site, and further government support is anticipated for future expansion.