Ramaco–Indium Brook mine gallium and germanium offtake: key notes for mine planners
Reviewed by Joe Ashwell

First reported on MINING.com
30 Second Briefing
Ramaco Resources has signed a non-binding MOU with Indium Corporation to negotiate supply of gallium and germanium from the Brook mine rare earth and critical-mineral project near Sheridan, Wyoming, described by Ramaco as the nation’s largest unconventional REE and critical-mineral deposit hosted in coal and carbonaceous ore. Brook is the first new US rare earth and critical-mineral mine in over 70 years, with full-scale mining and construction of a pilot processing facility for vertically integrated commercial oxide production already under way. Indium Corporation, a Clinton, New York-based refiner and solder manufacturer supplying the semiconductor and electronics sectors, would channel Brook gallium and germanium into domestic and allied advanced manufacturing supply chains.
Technical Brief
- Non-binding MOU structure means no fixed tonnages, prices, or delivery schedule are yet committed.
- Agreement scope is limited to gallium and germanium streams from the Brook mine critical-mineral development.
- Brook’s mineralisation is explicitly described as “unconventional”, being hosted in coal and carbonaceous ore rather than hard rock.
- Full-scale mining is already active while a pilot processing plant is still under construction on site.
- Indium Corporation will handle downstream refining, alloy development and product manufacture for semiconductor-grade gallium/germanium.
- Indium’s existing product lines include gallium- and germanium-based materials for electronics, EVs, aerospace and defence systems.
- Ramaco Resources is publicly listed on NASDAQ (tickers METC, METCB) with a US$698.8m market capitalisation.
- Market reaction to the MOU was positive, with Ramaco’s share price closing up 3.97% on announcement day.
Our Take
Ramaco Resources’ Brook mine in Wyoming already features in our database with non‑binding MoUs to supply rare earth carbonate to REalloys and customised rare earth oxide blends (including gallium) to Mulberry Industries, so the Indium Corp offtake further diversifies its downstream customer base across both alloy and semiconductor supply chains.
Indium Corporation appears repeatedly in recent gallium coverage, including US DOE’s TRACE‑Ga flowsheet programme and Rio Tinto’s Quebec gallium pilot, suggesting this Brook mine deal slots into a broader strategy of locking in multiple primary and by‑product gallium sources across North America.
With Brook described as the USA’s first new rare earth and critical mineral mine in over 70 years and Ramaco Resources still a sub‑$1 billion company by market capitalisation, securing early offtakes for gallium and germanium could materially de‑risk project financing compared with larger diversified miners pursuing similar critical‑mineral plays.
Prepared by collating external sources, AI-assisted tools, and Geomechanics.io’s proprietary mining database, then reviewed for technical accuracy & edited by our geotechnical team.
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