Matthew Stewart, Q.P.

Senior Process Engineer

Matthew Stewart is a Technical Services Engineer at McCarl’s Technical Services, where he provides lead engineering and project management for mining and industrial plant design throughout the Americas. With a deep background in concept studies, detailed engineering, and construction support, Matthew specializes in the development of complex flowsheets, piping and instrument diagrams (P&IDs), and project financial analyses. His diverse project portfolio includes leadership on rare-earth and coal recovery projects funded by the Department of Energy, as well as front-end engineering design (FEED) for greenfield battery recycling plants.

Matthew’s career is defined by a unique blend of heavy industrial engineering and high-tech research and development. He has held senior roles at Kappes, Cassiday & Associates and Altairnano, where he managed projects valued at up to $200M and led teams in the development of novel lithium-ion battery chemistries and pharmaceutical-grade inorganic compounds. A Qualified Person (QP) and co-inventor of patented process technologies, Matthew holds a B.S. in Materials Science and Engineering from the University of Nevada, Reno, and is a recognized expert in precious metals recovery, SART (Sulfidization, Acidification, Recycling, and Thickening) processes, and fluid flow modeling.