--- Company reiterates long-term targets and highlights value creation opportunities --- 

--- Presents capability to produce high-purity calcium metal to support domestic heavy rare earth metallization ---

--- Reveals a new application of its proprietary waste repurposing technology that extracts commercially valuable minerals from steel slag ---

NEW YORK, Sept. 23, 2026 (GLOBE NEWSWIRE) -- Minerals Technologies Inc. (NYSE:MTX) ("MTI"), a leading, technology-driven specialty minerals company, reiterated its growth targets, highlighted its near-term growth potential, and presented several new breakthrough innovations at its 2026 Investor Day on September 22.

At the event, which took place at MTI’s R&D facilities in Bethlehem, Pennsylvania, executive management, product line leaders, and R&D leaders provided an in-depth review of the company’s approach to innovation as well as some of its newest growth initiatives and long-term value creation opportunities.

Douglas T. Dietrich, MTI’s Chairman and Chief Executive Officer, discussed why the combination of MTI’s unique global mineral reserves and core technologies enable the company to provide valuable functional components to customers across a wide range of end markets. He also highlighted MTI’s strategic growth engines, including expansion into higher growth markets; deepening positions in existing core markets and geographies; and new products and solutions, including automation for steelmaking, PFAS remediation, waste repurposing in paper and packaging, Sustainable Aviation Fuel filtration, and more.

The company also shared details about a new high-value revenue growth opportunity in the production of high-purity calcium metal, a critical input in heavy rare earth metallization. MTI already produces calcium metal in the United States, supplying a material that is essential for producing high-strength steel. Building on this expertise, MTI has developed a new process to manufacture high-purity calcium metal, which supports the development of a domestic rare earth supply chain serving the aerospace and defense, transportation, renewable energy, electronics, and medical technology markets. MTI estimates that this opportunity will drive over $100 million in incremental revenue in the next several years.

Another emerging opportunity is derived from the company’s Crystal Engineering technology, which is the foundation for MTI’s proprietary NewYield® product that repurposes pulp waste from paper factories and can now be applied to other by-products like steel slag generated at steel mills. In the United States, three million tons of steel slag are currently being landfilled every year. MTI’s solution repurposes this slag by-product into commercially valuable mineral products, including critical minerals like magnesium and manganese, which are needed to support domestic infrastructure development and the production of batteries, electric vehicles, and aerospace and defense technologies. MTI estimates the total addressable market for this opportunity to be greater than $250 million in the U.S. alone, and projects that its technology will enable similar waste stream opportunities for other materials.