During a period of 3 days, 22 audio-magnetotelluric (AMT) soundings were made in the area of the Silver Star Hot Springs, Mont. (fig. 1). These soundings were made to assess the geothermal potential along a northern trend of. hot springs from New Biltmore Hot Springs north to Broadwater Hot Springs, Mont.
Scalar resistivities from the data log (table 1) show that thermal waters have probably altered the Cenozoic basin fill to the northeast for at least 4-5 km. Leakage of the geothermal system to the surface is probably taking place along a range-front fault at the contacts between the Precambrian metamorphics on the west and the Cenozoic basin fill on the east. Any potential geothermal system would probably be in the area near the existing hot springs or within a few kilometers to the north or northeast.