Abstract The majority of metallic ore deposits are related to processes associated with ancient or modern volcanic systems. Beyond geothermal energy production, volcanoes also represent a potential resource of critical metals, including those required for carbon‐neutral technologies. Geothermal metals occur in subsurface fluid reservoirs fed by surface and magmatic sources. Metals primarily derive from magmatic sources associated with hot, saline brine lenses. Imaging and characterizing such fluid bodies remains challenging. Here, we apply a joint inversion of P‐, S‐wave travel times and local earthquake parameters, to image the subsurface of Soufrière Hills Volcano, Montserrat. Analysis of seismic velocities, VP/VS ratio, and hypocenter distributions provide evidence for a subvolcanic, fluid‐saturated, and presumably metal‐rich lens at depths of ∼2–3 km. Our results also show evidence of previously‐confirmed hot and shallower geothermal systems. We discuss the implications of these results for the magmatic source region and the structure of the associated geothermal system.