Boston Metal raised $75 million to advance molten oxide electrolysis production of niobium, tantalum, tin, vanadium, nickel and chromium, with the round including participation from Tata Steel Unlimited following an electrolyte leak that delayed the Brazil facility startup. The technology, documented in the company's pilot runs producing one ton of steel at 1,600 °C in Woburn, Massachusetts, separates metals from ore via electric current in a molten electrolyte without carbon reductants. Construction of the Brazil plant began in 2024, with commercial operation now targeted for September 2026 after a refractory failure caused cash-flow shortfalls and 71 layoffs. The funding supports restart of the low-grade ore facility and US chromium projects, where the United States currently imports nearly all supply. Primary data from Carneiro statements confirm the round exceeds $500 million total raised and targets higher-value metals to validate the process ahead of steel applications. Related deployments of similar electrolysis methods in nickel and chromium refining, as reported in 2023-2025 industry filings from Glencore and U.S. Geological Survey mineral commodity summaries, show comparable energy intensity reductions of 30-40% versus traditional smelting routes.