A recent study reveals that the McDermitt Caldera, straddling the Nevada-Oregon border, contains significant lithium deposits. This caldera, approximately 28 miles by 22 miles in size, is linked to the Yellowstone hotspot, a series of ancient volcanos across the western U.S.
Lithium is concentrated in the caldera’s clay layers, particularly at Thacker Pass. The crucial discovery is that some layers are rich enough to be mined. Dr. Thomas R. Benson from Lithium Americas Corporation led the research, which showed how hot water and minerals circulated, enriching lithium in the clay over thousands of years. The process transformed smectite clay into illite, which has higher lithium concentrations.
At Thacker Pass, lithium levels reach about 1% by weight, making it nearly twice as rich as many global clay deposits. This difference comes from a combination of geological factors: the area’s heat, fluid movement, and the basin’s ability to trap elements.
Why does this matter? For the U.S., having domestic lithium sources is crucial. As demand for electric vehicle batteries and renewable tech rises, the country currently relies heavily on imports. A local supply like Thacker Pass could stabilize prices and shorten supply chains.
Geologically, the stacks of rock here are well-preserved. We can see how the hot flows of volcanic ash and the changing temperatures shaped the layers over time. Each layer tells a story, revealing the evolution from volcanic eruption to rich ore.
This research highlights something important: not all calderas can produce lithium. The McDermitt Caldera combines the right heat, minerals, and geological conditions. This unique blend has made it a focus for future lithium mining, potentially supporting the U.S.’s clean energy transition.
Experts emphasize that domestic lithium sources like the one found here will play a key role in meeting future energy needs. As electric vehicle production grows and battery recycling technologies advance, sites like McDermitt could make a significant contribution to a more sustainable future. You can read more about the study in the journal Science Advances here.
