Self Potential and Gravity Study for Geothermal Exploration of Nevis

A geophysical team from the Massachusetts Institute of Technology and SP International, Inc. performed self potential and gravity surveys on the island of Nevis for geothermal exploration under contract from the Organization of American States, Geo-Caraibes Project. The preliminary geothermal model for the Charlestown area of interest based on SP current sources and gravity, places a large high gravity body under most of the area with geothermal fluids flowing on the edge of the body. We believe the Charlestown area is underlain by a heat source which may be capped by an impervious layer, therefore permeability for geothermal fluid upflow is mainly limited to faults and fractures and other high permeability conduits. The most intense current sources are located on or near the edge of the high gravity body.