Appalachian Mountains lithium deposit could replace 328 years of imports, USGS says

A rumor spread in May 2026 that the U.S. Geological Survey announced it had discovered enough lithium in the Appalachian Mountains to replace imports of the metal for centuries. 

Polymarket, an online betting platform, posted the claim on X, saying the newly discovered lithium deposit could replace "328 years" of imports (archived):

(@Polymarket/X)

The post read:

JUST IN: Scientists discover massive lithium deposit in Appalachia with enough supply to replace 328 years of U.S. imports.

Other posts on Facebook amplified the story, and Snopes readers searched the website and emailed, seeking to confirm the veracity of the rumor. 

The claim that USGS announced the discovery of a massive lithium deposit that could potentially replace many years of imports was true. On April 28, 2026, the USGS published an announcement saying, "The southern Appalachians hold an estimated 1.43 million metric tons of lithium oxide" and "the northern Appalachians hold an estimated 900,000 metric tons." This, the USGS said, could be enough to ensure the United States' "mineral independence" for centuries to come.

It is worth emphasizing that the statement announced an estimate of the size of the deposit — and the number of years of imports it could replace — that had not yet been fully confirmed as of this writing.

But the existence of the deposit does not by itself guarantee access to lithium. Extraction can pose significant challenges. We have reached out to the USGS asking for details on what it would take to access the Appalachian deposit of lithium. In addition, we have reached out to several independent experts in lithium extraction. We will update this report should they respond.

The stakes

As climate change accelerates, biodiversity shrinks and extreme weather events multiply. This is why limiting carbon dioxide emissions has become a priority for many countries. Lithium-ion batteries help curb emissions and facilitate the transition away from fossil fuels (for example, with electric vehicles). Further, mobile devices such as telephones, tablets and laptops use lithium-ion batteries for power. Lastly, such batteries can contribute to ensuring a steady supply of electricity and the stability of an electric grid.

As a result, governments and experts have deemed the metal a strategic resource, and the U.S. could benefit from no longer relying on lithium imports. The USGS included lithium on its 2025 "list of critical minerals." In 2024, the U.S. produced less than 1% of the global supply of lithium, according to the Dallas Federal Reserve.

The USGS announcement underscored the importance of "mineral security" for the U.S. It read:

The estimated 2.3 million metric tons of lithium oxide in the Appalachian region would be enough lithium for batteries in:

• 1.6 million grid-scale batteries large enough to stabilize an electric grid
• 130 million electric vehicles
• 180 billion laptops, or a 1,000 year-supply of laptops for the world (at 2025 levels)
• 500 billion cellphones, or 60 cellphones for each person on earth

The lithium oxide in the Appalachian region "is present in pegmatites, large-grained rocks similar to granite," the USGS said in its statement.

The challenges

While access to lithium has become paramount for the U.S., extracting the mineral presents major technical and environmental challenges. 

A 2022 report by a group of researchers at The Nature Conservancy acknowledged the strategic importance of lithium. The report also underscored that while developing lithium-ion batteries was key to combat climate change, extracting lithium could cause major environmental issues.

The team assessed three different types of extraction: "direct lithium extraction (DLE) from brine, evaporative concentration from brine, and surface mining."

Brine lithium extraction means taking the mineral from lithium-rich saline groundwater. The traditional method involves allowing the water to evaporate to collect the mineral in open ponds or open mines, which can take months and is destructive to the landscape. 

Instead, DLE involves pumping the brine through a processing unit where a type of resin attracts lithium molecules (a process known as adsorption). The lithium is then "rinsed" off the resin for collection. DLE is the most environmentally friendly way to extract lithium because it preserves aquifers by returning the saline water to the ground. 

Rock extraction may be the most invasive, according to the report:

Lithium mined from hard rock and clay may result in impacts that are well-documented for strip mining and open-pit mining, including physical disturbance of soils and vegetation; air emissions and deposition; stream sedimentation; potential contamination of soils, sediments, and ground and surface waters; and groundwater and surface water depletion.

Given that, according to the USGS, the lithium in the Appalachian region exists in hard rocks, its extraction may result in major destruction of the environment. This, in turn, could severely affect biodiversity and human health, potentially making the deposit prohibitively difficult to exploit. 

For further reading, we investigated a claim that U.S. President Donald Trump demanded that Zambia hand over its mineral rights to the U.S. in exchange for HIV/AIDS medication.