Appalachian Mountains contain enough lithium to produce billions of electronic devices and electric vehicle batteries, according to new research by the US Geological Survey(USGS).
Scientists estimate the region holds around 2.5 million tons of lithium across several eastern US states. The findings place the Appalachian region among the most important untapped lithium zones in the country.
Researchers said the amount of lithium identified is enough to manufacture around 500 billion smartphones. It could also support the production of about 180 billion laptops and nearly 130 million electric vehicles. These estimates show the scale of the mineral resources hidden beneath the ancient mountain system.
Large Lithium Deposits Across Appalachians
The lithium deposits stretch from Alabama in the south to Maine in the north. Scientists found the mineral inside coarse-grained rocks called pegmatites, which often contain valuable minerals. These rocks formed millions of years ago during ancient geological activity beneath the Earth’s surface.
The US Geological Survey released its findings through two separate studies focused on the northern and southern Appalachian regions. The northern study was published in April in the journal Natural Resources Research. The southern assessment followed in May in the same journal.
Christopher Holm-Denoma, a USGS research geologist and co-author of the northern study, said this was the first full mineral resource assessment of Appalachian lithium deposits.
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Researchers used geological maps, mineral records, geochemical data, and tectonic history to estimate the reserves. They also applied computer models using global lithium deposit data to improve the calculations.
Scientists estimated that the northern Appalachians contain around 990,000 tons of lithium. This region includes parts of Maine, New Hampshire, Vermont, New York, Massachusetts, Connecticut, Rhode Island, Pennsylvania, New Jersey, and Delaware. Maine and New Hampshire hold some of the highest concentrations identified in the study.
One important site is the Plumbago North pegmatite deposit in Maine. Researchers said the deposit contains spodumene, a mineral with high lithium content. Spodumene is widely used in lithium extraction because processing methods are already well established.
The southern Appalachian region holds even larger estimated reserves. Scientists calculated that the area contains around 1.57 million tons of lithium. The deposits are mainly located in Maryland, Virginia, North Carolina, South Carolina, Georgia, Tennessee, and Alabama.
North Carolina and South Carolina stand out because they already have a long history of lithium mining. Large-scale lithium pegmatite mining operated there from the 1940s until the 1990s. The new findings renew attention on these areas as demand for battery materials continues to increase worldwide.
Why Lithium Matters for the US
Lithium is one of the world’s most important industrial minerals today. It is widely used in rechargeable batteries for smartphones, laptops, electric vehicles, and energy storage systems. The mineral also supports aerospace manufacturing, military systems, industrial lubricants, and some medical treatments.
Demand for lithium has increased sharply over the past decade due to the rapid expansion of electric vehicles and clean energy technologies. Governments and manufacturers are competing to secure long-term supplies of major battery materials. This has increased pressure on countries to build stronger domestic supply chains.
The US still depends heavily on imported lithium despite holding large reserves. According to the USGS, more than half of the lithium used in the country comes from foreign suppliers. Major global producers currently include China, Argentina, and Chile.
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The US currently operates only one active lithium mine in Clayton Valley, Nevada. Many products containing lithium are also manufactured overseas before being imported into the US. This means the country imports both raw lithium materials and finished products containing the mineral.
Researchers said the Appalachian reserves could reduce dependence on foreign supply chains if mining projects move forward. The estimated reserves could replace US lithium imports for more than 300 years at current import levels. That makes the discovery strategically important for energy security and advanced manufacturing.
Environmental Questions Remain Around Lithium Mining
Despite the large resource estimates, experts say mining development would still face major environmental and regulatory challenges.
Lithium extraction can affect water supplies, land stability, and local ecosystems if operations are not carefully managed. Communities near future mining areas may also raise concerns about land use and environmental protection.
Pegmatite deposits are smaller than many other mineral formations. Individual deposits often measure only a few hundred feet in length and width. However, researchers said the total number of deposits across the Appalachian region creates a significant combined resource.
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The new studies are part of a larger national effort by the US Geological Survey to identify domestic lithium resources. Scientists are also examining lithium found in ancient volcanoes, salt brines, and dried lakebeds across the country. Federal agencies see these studies as important for long-term energy planning and industrial growth.
Global competition for lithium is intensifying as electric vehicle production expands worldwide. Governments are investing heavily in battery manufacturing and clean energy infrastructure. Domestic lithium production is becoming an increasingly important economic and national security issue.
The Appalachian findings add a new dimension to the US’s important minerals strategy. Future exploration and investment will determine how much of the identified lithium can be economically extracted. The discovery also signals that older geological regions still hold valuable resources that modern technology is only beginning to fully understand.
