The A34 demonstration facility operated by West Virginia University (WVU) in Mount Storm treats acid mine drainage (AMD) from coal mining while recovering rare earth elements. WVU states that after separating and refining the recovered material downstream, it achieved purity levels exceeding 95% for both light rare earth oxides (LREO) and heavy rare earth oxides (HREO). In an on-site report published by AFP on August 22, Lance Lin, director of the WVU Rare Earth Elements Initiative, described the facility's capacity as approximately 4 metric tons of rare earth oxides per year, with heavy rare earths accounting for about 45% of that total.
However, the 4-ton figure represents facility capacity rather than actual annual production for 2026. This on-site report was not accompanied by a new peer-reviewed paper on A34. The published materials lack the recovery rates, mass balance data, and continuous-operation metrics needed for a full assessment, and chemical and energy consumption, waste volumes, and costs remain undisclosed. How close this comes to commercial supply will depend on operational data yet to be released.
A34 Processes Real Wastewater at 500–1,000 Gallons Per Minute
A34 is an integrated pilot facility jointly operated by WVU and the West Virginia Department of Environmental Protection (WVDEP) that handles actual wastewater. According to publicly disclosed conditions from a WVU case study, influent total rare earth element (TREE) concentration is approximately 1,583 micrograms per liter, with an influent pH of about 2.8 that rises to approximately 7.5 after treatment. Flow rate is roughly 500–1,000 gallons per minute.
By mass composition of influent TREE, dysprosium (Dy) accounts for about 6%, terbium (Tb) about 1%, yttrium (Y) about 29%, and neodymium-praseodymium (NdPr) about 19%. These four groups together represent roughly 55% of TREE mass, and WVU's assessment states they account for over 85% of the value. However, since the same page does not disclose a pricing reference date or price table, this value percentage cannot be translated into current revenue figures or profitability.
The published values represent a single-site case study, and neither the number of sampling events nor the observation period is specified. Therefore, the concentration and composition figures are the publicly disclosed conditions for A34 influent specifically—not an average that accounts for other AMD sites or seasonal variation. Similarly, the annual 4-ton figure and roughly 45% heavy rare earth share described in the AFP report pertain to the composition and capacity of recovered material, not to the facility's overall recovery rate or its actual contribution to U.S. demand.
Metals Dissolved by Acid, Pre-Concentrated Through Staged Neutralization
AMD is wastewater in which acid generated by the oxidation of sulfide minerals dissolves metals from surrounding rock. Because rare earths are already dissolved in the water, the mining, crushing, and grinding steps normally required as pretreatment for hard-rock mining can be skipped. On the other hand, the target is a dilute solution, and the stability of flow rate and composition determines profitability. Chemical usage, precipitate transport, and downstream separation all add to operating costs.
A 2021 peer-reviewed paper in Minerals by Tommee Larochelle and four co-authors (DOI: 10.3390/min11111298) technoeconomically modeled a staged neutralization process. According to the process description in the paper, the design precipitates iron and most aluminum at pH 4–4.5, then precipitates the entirety of the rare earths along with most cobalt and manganese as a pre-concentrate at pH 8–8.5.
The term "entirety" here refers to rare earth precipitation as described in this process design—not verified recovery results confirmed through a full-year mass balance at A34. Additionally, the over-95% figure WVU cites is the product purity achieved after downstream refining, a distinct metric from the recovery rate—that is, how much was actually extracted from the wastewater. Achieving high purity demonstrates a downstream processing milestone, but commercialization also requires recovery volume and reproducibility of operations.
What 808 Samples From 141 Sites Reveal About Resource Distribution
To assess whether rare-earth-bearing AMD is unique to A34 or more widespread, a 2019 peer-reviewed paper in Mining, Metallurgy & Exploration by Christopher R. Vass and two co-authors offers relevant data (DOI: 10.1007/s42461-019-00112-9). The paper analyzed 185 samples of untreated AMD and 623 samples of AMD precipitate (AMDp, a treatment byproduct) from 141 treatment sites across the northern and central Appalachian region—a broad survey totaling 808 samples.
Average TREE concentration was 282 micrograms per liter in water and 724 grams per ton in solid byproduct. The research team estimated total stored resources across the 141 sites at 340 tons, but this figure represents neither the total inventory across the entire watershed nor an annual supply capacity—it is an estimate limited to the 141 sites included in the analysis.
This study is observational and broad-based, showing correlations such as those between low pH and rare earth loading. It is not an experiment that causally proves A34's process will be profitable at commercial scale. Nor does the 141-site survey serve as an independent replication of A34's continuous operations. Whether other research institutions can reproduce the same recovery rates or product purity based on published A34 data remains an open question.
The Gap Between 4-Ton Capacity and a Hypothetical 300-Ton Scenario
Comparing scales reveals a substantial gap between pilot demonstration and supply-chain reality. According to the USGS Mineral Commodity Summaries 2026 (DOI: 10.3133/mcs2026), the United States produced 51,000 tons of mineral concentrate (in REO equivalent) in 2025. A34's approximately 4-ton annual capacity is not on a scale that could replace this total.
Speaking to AFP, David Hoffman estimated that if AMD-derived rare earths could be produced at 300 metric tons per year, this could meet 7–8% of global demand for elements like Tb and Dy. This is an estimate based on a hypothetical 300-ton scenario—not A34's actual output. The article does not specify the demand denominator or reference year for each target element. Without knowing the required number of sites or recovery rates, the 7–8% figure cannot be treated as an already-realized supply contribution.
The 2021 Larochelle paper is likewise not a study of measured profitability but a technoeconomic simulation. It modeled four pricing scenarios—September 2021, December 2020, and the lowest and highest prices from 2014–2021—alongside five production configurations, projecting an internal rate of return (IRR) of 25–32% at September 2021 prices. Under the lowest-price scenario, however, IRR fell below the 10% benchmark for some configurations.
Moreover, the model assumes free acquisition of the pre-concentrate and is a theoretical evaluation combining METSIM, literature data, and thermodynamic simulation. Capital costs were estimated at AACE Class IV/FEL-2 accuracy, with a margin of ±40%. Because IRR would shift with changes in pricing, feedstock sourcing, and capital cost assumptions, the 25–32% profitability figure has not been confirmed through actual A34 operations.
DOE/NETL project FE0032296, covering FEED and pre-construction planning from August 1, 2023 to April 30, 2025, received $8,000,000 in DOE funding out of a total $11,704,182. A facility designed to produce 1–3 metric tons of mixed rare earth oxide (MREO) per day represents a design target—not the actual output of the existing A34 facility. The evidence needed to close this gap has not yet been published.
Beyond Recovery: Element Separation and Magnet Manufacturing Remain
Even after rare earths are recovered as precipitate or mixed oxide, the supply chain does not end there. Without further separation into individual elements, metallization, alloying, and magnet manufacturing, the material cannot reach applications that require Dy or Tb. According to USGS, U.S. imports of rare earth compounds and metals from 2021–2024 came from China (71%), Malaysia (13%), Japan (5%), Estonia (5%), and other sources (6%).
Mission Critical Materials, a WVU spinoff, has selected REAlloys as a partner for downstream processing. What AFP reported is a preliminary agreement, not a finalized long-term purchase contract or confirmed supply track record. Demonstrating the recovery process on real wastewater and successfully linking downstream processes through to magnet production are two separate things that must be verified independently.
A34's value lies not in immediately replacing the entire U.S. rare earth supply, but in its potential to handle feedstock relatively rich in Dy, Tb, and Y in combination with environmental remediation. The next judgment will depend on whether peer-reviewed data from full operations can demonstrate sample sizes and recovery rates, along with mass balance figures and operational duration. Only once this is combined with a track record spanning element-by-element separation through magnet manufacturing can AMD recovery be meaningfully compared as a supply source.