The US just found millions of tons of lithium in Appalachia, enough for 500 billion cellphones — and experts say it could power the next century of American tech and weaken China's grip on batteries

• Lithium deposits identified across Appalachia could supply hundreds of years of imports
• Domestic discoveries across multiple states point to expanding lithium exploration efforts
• Extraction capacity remains the biggest challenge despite large confirmed resource estimates

Lithium buried beneath parts of the Appalachian region could supply the United States with hundreds of years of material essential for batteries, electronics, and large-scale energy storage systems.

New estimates from the United States Geological Survey point to roughly 2.3 million metric tons of lithium oxide located in pegmatite formations spread across areas of the eastern United States.

Much of the material is believed to sit beneath sections of the Carolinas, while additional deposits are estimated to lie under parts of western Maine and New Hampshire.

Appalachian lithium resources concentrated inside pegmatites

Reporting on the news, Fortune says the scale is large enough to replace about 328 years of US lithium imports based on recent demand levels, a number that shows just how dependent the country has become on foreign sources for key battery materials.

The deposits could support production of about 500 billion cellphones, along with billions of laptops and tablets, or enough batteries to power roughly 130 million electric vehicles if the material can be recovered at commercial scale.

Much of the discussion around lithium now centers on supply chains, especially since China dominates the production of finished lithium-ion batteries used in devices ranging from smartphones to electric vehicles and backup systems in data centers.

Demand continues rising as manufacturers move away from older battery types, while lithium-ion technology remains widely used in systems that require fast charging and long operating life.

USGS says lithium resources in Appalachia are concentrated inside pegmatites, large-grained granite-like rock formations that can trap valuable elements during cooling and crystallization deep underground.

Accessing the material remains the biggest hurdle, since the United States currently produces only a small share of global lithium output despite rising domestic demand.

The country produced about 610 metric tons of lithium recently, accounting for roughly 0.3% of worldwide production, while most refining and large-scale battery manufacturing continues to take place overseas.

In December 2025 we reported how researchers identified lithium-rich clay deposits inside the McDermitt Caldera along the Nevada–Oregon border, where geological surveys suggested between 20 million and 40 million metric tons of lithium-bearing material could exist.

Geological analysis showed that layers of volcanic ash and long-running hydrothermal activity enriched soft sediments with lithium, creating clay bands that in some cases sit close enough to the surface to allow open-pit extraction.

Industry planners continue to point out that discovery alone does not guarantee production, since refining capacity, environmental permits, and infrastructure determine how quickly resources reach the market.

Government-backed funding and private investment projects are already underway in places such as Arkansas, where chemical extraction methods are being tested to increase domestic production capacity.

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