Neptune Energy announced a resource estimate of 43 million tons of lithium carbonate equivalent (LCE) for its Altmark project in Saxony-Anhalt, Germany—not 43 million tons of elemental lithium. The company says Sproule ERCE assessed the resource under the CIM/NI 43-101 standard. This is a project resource estimate, not proof of a commercially recoverable reserve or an operating lithium mine.
What Germany’s 43-million-ton lithium figure means
The estimate applies to Neptune Energy’s Altmark project in northern Saxony-Anhalt. Neptune announced it on 24 September 2025, saying it had commissioned Sproule ERCE in August 2025 to assess the project’s resource base. The company identifies CIM/NI 43-101 as the reporting standard. Neptune’s announcement calls the quantity a resource; it should not be restated as a commercially recoverable reserve.
LCE expresses the amount as an equivalent quantity of lithium carbonate, a compound used in battery supply chains. It is not a claim that the field contains 43 million tons of elemental lithium or finished battery material. Nor does the estimate alone establish how much could ultimately be extracted economically.
How lithium extraction fits the former gas field
Neptune says it and predecessor companies have produced natural gas in Altmark since 1969. Its proposed lithium project would extract lithium from brine using direct lithium extraction (DLE), rather than developing an open-pit mine. The company describes its planned process as avoiding open pits and evaporation ponds and requiring minimal land; those are operator claims, not an independently verified environmental assessment for Altmark. Neptune’s Altmark project page outlines the company’s description of the project.
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What has been tested—and what remains ahead
Neptune reported that a second pilot with technology partner Lilac was completed in August 2025. It used ion exchange and produced battery-grade lithium carbonate, according to the company. In September 2025, Neptune said a third pilot began to evaluate adsorption. The reported work establishes pilot activity, not commercial production or proof that either approach is ready for full-scale operation. The second-pilot announcement describes the ion-exchange result.
The company said the next step after the pilots would be a demonstration phase to test a fully integrated extraction plant, subject to further mining permits. Neptune’s project page, accessed 7 October 2026, also lists an October 2026 update announcing Pilot Phase II with Fraunhofer IEG to test new materials for DLE from brine. The page listing does not establish the results or schedule of that work. Neptune’s project page carries the update listing.
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The two reported pilot approaches cannot yet be meaningfully ranked from the published details cited here: the company reports an ion-exchange pilot that produced battery-grade lithium carbonate and an adsorption pilot under evaluation, but no comparable recovery rates, costs, energy use, reagent use, water balance, or lifecycle emissions.
Economic projections are scenarios, not results
Neptune summarized an IW Consult economic-impact study that modeled possible effects if the project produced up to 25,000 tons of LCE annually. Under that scenario, the study projected €6.4 billion in gross value added across Germany during 2025–2042 and up to 1,500 jobs annually. These are conditional projections, not value or employment already generated by the project.
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Neptune says the study considers direct, indirect, and induced effects and assumes a ten-year production period, alongside development and investment phases; it notes that actual production could last longer. The company’s summary does not make the modeled outcomes equivalent to a final investment decision, permitted project, or production forecast. Neptune’s summary of the IW Consult study provides the assumptions and projected figures.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What the announcement does—and does not—establish
The announcement is significant as a reported resource estimate in Germany, but it does not settle whether Altmark will become a commercial source of lithium. Neptune’s statements and summaries establish what the company has announced; the underlying technical assessment and full economic-impact study are not presented in the cited announcements. Commercial recoverability, final project economics, production timing, permitting outcomes, and comparative environmental performance remain unestablished by these figures.
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Neptune CEO Andreas Scheck said the assessment underscored the potential of the company’s Saxony-Anhalt license areas and could contribute to German and European lithium supply. That is the company’s view of potential, not an independently established market share or output. The resource announcement contains his statement.
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