Isselhardt, C.F., Motyka, R.J., Matlick, J.S., Parmentier, P.P., and Huttrer, G.W., 1983, Geothermal resource model for the Makushin geothermal area, Unalaska Island, Alaska: Geothermal Resources Council, Transactions v. 7, p. 99-102.
Cumulative evidence collected to date in the Makushin Volcano geothermal area indicates the presence of a widespread (402 hn2), commercial temperature (195+C) geothermal system centered along a northeast-trending structure. The heat source driving this system is probably a partially molten to molten intrusive body related to the active Makushin Volcano. Geochemical data suggest the existence of a liquid-dominated sys- tem with a discontinuous steam cap. Pervasive fracturing, found in the core holes and on. the surface through field mapping and analysis of aerial photographs, appears to be sufficient to support a commercial size geothermal reservoir. This hypothesis can only be verified conclusively by deep drilling and testing.
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