At this point it seems that there is an underground hot water reservoir coming relatively near the surface within an area of 8 sq km near the base of Mt St Catherine.
This is what is most likely to happen next: additional MT measurements within the area located and gravity measurements within that area also. Gravity at a particular location is affected by the density of the land below it. Rock has a density around 2.6gm/cc. Water has a density of 1gm/cc. So a cave full of water 20 feet deep is like a piece of rock about 4 ft thick, so gravity above a water filled cave will be less than normal. The measurements also have to take account height above sea level, neighboring hills and missing material where there are valleys.
Both of the above steps will provide more detail as to where any geothermal resource is located. Following that wells would be drilled to finally prove the field.
Once the field's extent is known, the site for the generation station can be established. An operating station is likely to have several wells, with the heads close together but their outlets separated an appropriate distance.
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