Volcanoes can wreak devastation when they erupt, but they're also a valuable natural resource: the liquids that bubble up from magma are often rich in important metals.In fact, most mining of metals like copper, zinc, and lead happens on ancient, extinct volcano sites. As demand for these materials increases – for batteries, computers, and more – active volcanoes could top up existing supplies.Now, researchers led by a team from the University of Oxford have discovered what they think is a substantial zone of metal-bearing fluids – potentially the beginnings of a new ore – deep in an active volcano in the Caribbean.The researchers used seismic wave analysis to identify the composition of the rock under the Soufrière Hills volcano. (Bogiatzis et al., Geophys. Res. Lett., 2026)Their work mapping the Soufrière Hills volcano has been published in Geophysical Research Letters, and is notable not just for what the team found, but how they found it: using earthquake data."Volcanoes are not only sources of geothermal energy but also contain metals needed for modern technologies and the net-zero carbon transition," write the researchers in their published paper."These metals are often carried by hot, salty magmatic fluids a few kilometers beneath the surface, but detecting and studying these hidden reservoirs is challenging."