Long Valley caldera has keen explored for its potential geothermal resources for at least two decades. Unocal Geothermal dril-led two deep test wells on the resurgent dome of the caldera during 1979. Neither of these wells encountered a deep, high temperature geothermal reservoir. The results from these wells and other geologic data focused exploration on the western caldera moat. Encouraging temperature q r a d i e n t data in 1982 led to the drilling of a deep test well in 19F5. That well, IDFU 44-16, encountered deep temperature reversal s and a sequence of rocks unlike the previous penet ration s on the resurgent dome. Evidently the well is still within the ring fracture system of the caldera and not within a cent r a l, upwelling, hydrothermal system which supplies the caldera ' s discharge.

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