New research suggests that the Appalachian Mountains may hold enough lithium to support the United States for decades, possibly even more than a century.
According to a study by the U.S. Geological Survey, large amounts of lithium are buried in rocks across both the southern and northern parts of the region.
Scientists estimate there are about 2.3 million metric tons of lithium oxide in total.
Much of this resource is found in the Carolinas in the south, and in Maine and New Hampshire in the north.
The lithium is stored in a type of rock called pegmatite, which forms deep underground and contains large crystals.
Lithium has become one of the most important materials in the modern world.
It is a key ingredient in lithium-ion batteries, which power everyday devices like phones and laptops, as well as electric vehicles, renewable energy storage systems, and even some military equipment.
As demand for clean energy grows, the need for lithium is rising quickly.
Right now, the United States depends heavily on imports to meet its lithium needs. Although the country once led global production decades ago, it now has only one major lithium producer and imports more than half of what it uses.
This has raised concerns about supply security, especially since countries like Australia and China play major roles in lithium production and processing.
The new findings suggest that domestic resources could help reduce that dependence. The amount of lithium estimated in the Appalachian region is large enough to support many industries.
For example, it could supply batteries for millions of electric vehicles or large-scale energy storage systems that help stabilize power grids.
However, these estimates come with uncertainty. The figures represent a midpoint, meaning there is an equal chance that the true amount is higher or lower. Scientists also note that not all of this lithium can necessarily be mined economically.
Factors such as cost, technology, environmental concerns, and market prices will determine how much can actually be extracted.
The origin of this lithium goes back more than 250 million years, when ancient continents collided to form the supercontinent Pangea. The intense heat and pressure during this process caused deep rocks to melt, creating magma rich in lithium.
As this magma cooled, it formed the pegmatite rocks that now contain these valuable deposits. Similar formations can also be found in parts of Europe, such as Ireland and Portugal, which were once connected to North America.
This new study builds on decades of geological research but uses more advanced methods, including computer simulations and global data comparisons, to estimate how much lithium might still be undiscovered.
Even so, turning these resources into a reliable supply will take time. Mining projects require careful planning, environmental safeguards, and significant investment. While the discovery does not solve immediate supply challenges, it highlights a promising opportunity.
In the long term, these hidden resources beneath the Appalachians could play an important role in supporting the transition to cleaner energy and strengthening the country’s mineral independence.
