Paper Title
Preliminary Geoscience Observations of Volcano Hosted Geothermal at Mt.Pandan, East Java, Indonesia

Abstract
A preliminary study of geophysical methods has been conducted to investigate the resources of volcano hosted geothermal at Mt. Pandan, East Java, Indonesia. In this research, geochemical and magnetic methods have been applied to determine the location of reservoir, fluid content of manifestation, and reservoir temperature. Geochemical method was used to determine the fluid content of manifestation and reservoir temperature based on the chemical content of the manifestation fluid. The magnetic method was applied to investigate the low magnetic anomaly that defined as existence of geothermal reservoir. 2D and 3D modeling was performed to illustrated the reservoir. The temperature of geothermal reservoir of Mt. Pandan was classified into medium temperature in the range of 125-225 °C. While, the result of magnetic method shows the magnetic residual intensity in the range of -77.47 to 75.76 nT. The low magnetic value representing the existence of subsurface heat activity distributed at the northeast and west of the research area. Keywords - Mt. Pandan, Geochemical Method, Magnetic Anomaly, Geothermal