USGS study finds 2.3 million tonnes of recoverable lithium in Appalachian pegmatites
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The U.S. Geological Survey has identified approximately 2.3 million tonnes of recoverable lithium oxide in pegmatite rocks beneath the Appalachian Mountains. The estimate, published in Natural Resources Research, suggests the deposit could meet U.S. lithium demand for 328 years at current consumption and import rates. The study highlights northern and southern Appalachian regions as the highest-potential areas.
Key Facts
- The USGS study estimates 2.3 million tonnes of recoverable lithium oxide in Appalachian pegmatite rocks.
- Northern Appalachia holds about 900,000 tonnes and southern Appalachia about 1.43 million tonnes of extractable lithium.
- At current U.S. consumption and import rates, the deposit could meet demand for 328 years.
- More than 20 USGS geologists and geophysicists ran 20,000 simulations to identify the highest-potential areas.
- Global lithium demand is projected to grow more than 40-fold by 2040.
Deposit Estimates
The study, published in Natural Resources Research, identifies pegmatite rocks beneath the Appalachian Mountains as a major lithium source. Northern Appalachia contains approximately 900,000 tonnes of extractable lithium, while southern Appalachia holds about 1.43 million tonnes. The combined estimate of 2.3 million tonnes of recoverable lithium oxide is based on public geological data and mineral maps.
Assessment Methodology
More than 20 USGS geologists and geophysicists combined public geological data with mineral maps to identify potential lithium sites. The team ran 20,000 simulations comparing the Appalachian data with known lithium deposits worldwide. Modeling identified Maine, New Hampshire, and Vermont as the highest-potential northern states, while Carolina regions ranked highest in the south.
Strategic Implications
Global lithium demand is expected to increase more than 40-fold by 2040, driven by battery production. The discovered resource is equivalent to providing 60 smartphones for every person on Earth or producing laptops continuously for 1,000 years. Officials say the discovery could reduce U.S. dependence on foreign strategic raw materials and restore an independent position in the lithium market.
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USGS study finds 2.3 million tonnes of recoverable lithium in Appalachian pegmatites
