Brook
The Mine Challenging the Chinese Monopoly
The Brook mine, located in southern Wyoming, has become the first U.S. mining facility for rare earth elements and critical minerals in over 70 years. Ramaco Resources’ project aims to produce gallium and germanium oxides from an unconventional deposit extracted from coal and carbon materials, with an initial estimated capacity of 150 tons per year of purified materials. This level of production corresponds to 3–4% of the current global demand for such metals, which are essential for high-efficiency semiconductors and AI applications. The event is not only a mining fact: it represents the first concrete attempt to rebuild a domestic supply chain for materials in which China controls over 95% of global capacity.
The operational mechanism is based on a non-binding agreement between Ramaco Resources and Indium Corporation, which guarantees access to advanced purification technologies. The agreement involves collaboration in developing a vertical supply chain: from mining to the production of commercial oxides. Production capacity is limited by the complexity of the chemical process, which requires high temperature and pressure conditions, as well as liquid helium cooling systems for stabilizing reactive flows. The time required to bring the plant into full operation is estimated between 24 and 30 months after regulatory approval, with an initial investment cost of approximately $185 million.
The infrastructural node of purification
The central infrastructure of the Brook mine is not only the mine itself, but also the complex of chemical plants necessary to transform raw minerals into industrial materials. The process involves three main phases: extraction from carbonaceous shale (which contains gallium and germanium at concentrations between 10–50 ppm), separation using organic solvents, and final purification by vacuum distillation. Each phase requires specialized equipment: titanium reactors for acid treatment, ion exchange columns with synthetic resins, and liquid helium recovery plants — a critical gas that serves as a refrigerant at -269 °C.
Production capacity is limited by physical factors: the cycle time for each purification batch is estimated at 72 hours, with a maximum operating threshold of 80 liters per minute for the reactors. The availability of liquid helium represents a structural bottleneck: in the United States, annual production is limited to approximately 15 million cubic meters, with a concentration of 90% in a few strategic plants. The Brook mine will therefore need to enter into a long-term contract to ensure a continuous supply of this material, which cannot be replaced by industrial alternatives without loss of quality.
Who pays and who benefits in the new equilibrium?
Ramaco Resources, a company listed on the NASDAQ with an EBITDA of $8 million in Q3 2025, bears the entire initial cost of the project. The financing comes from a combination of equity and long-term bond loans, with a BB+ rating assigned by S&P Global Ratings — a status that imposes high interest costs (approximately 7.2% per year). The company has already obtained a concession for 4,500 acres in the area of the deposit, but does not have proven reserves: the estimate of 1.7 million tons is based on geological data and simulation models, not on definitive drilling.
Indium Corporation, on the other hand, benefits without assuming operational risk. Its role is limited to providing the purification technology and guaranteeing the purchase of finished products at a price fixed according to the spot market, with a minimum threshold of 100 tons per year for the first three years. This model reduces operating costs for Ramaco but transfers the demand risk responsibility to Indium, which already has extensive experience in the rare metals market and an international logistics network.
The Trajectory and Structural Limit
The strategic goal of the Brook mine is to reduce U.S. dependence on foreign suppliers, but success depends on a number of critical factors. The first is regulatory approval: the Wyoming state’s Natural Resources Commission has already granted 4,500 acres of permits, but opinions from the EPA and the Fish and Wildlife Service regarding potential environmental impacts are still pending. The second is the time required for startup: even with immediate approval, construction of the chemical reactors will take at least 18 months.
The most significant structural limit is represented by the availability of liquid helium. If the global market fails to increase production, the plant may be forced to operate at 60% of its maximum capacity, which would have a direct impact on economic returns. The indicator to monitor over the next six months is the price of liquid helium: if it exceeds $12 per cubic meter (as of 2025), the project’s profitability becomes uncertain. At the same time, an increase in global demand from Chinese factories could create pressure on world supplies.
“Ramaco Resources has entered into a non-binding memorandum of understanding with Indium Corporation to explore the potential supply of gallium and germanium from its Brook Mine project in Wyoming.” — Ramaco Resources, MINING.COM
Photo by Shiva Prasad Gaddameedi on Unsplash
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