There are at least 51 sites of thermal springs in the Peninsular Malaysia have been recognized and about 20 sites are selected to be studied on their sub-surface reservoir temperatures using the available previous data collected by the Minerals and Geoscience Department Malaysia (JMG) since 1980s. The previous data available from the 23 sites i.e. surface temperature, geology, chemistry of thermal waters, etc. have been analysed, to evaluate the sub-surface reservoir temperatures in granitic systems. The range of reservoir temperatures for the overall selected thermal springs, were calculated by using the T_quartz, T_Na/K and T_Na-K-Ca methods. Generally, the reservoir temperatures range from 105.3oC - 154.2oC (Tquartz), 127.3oC - 199.7oC (T Na/K) and 115oC - 208oC (T Na-K-Ca). Result of the reservoir temperatures estimation by using the T chalcedony method are generally low and does not reflect the geothermal systems probably due to dilution effect during the ascent of geothermal fluids. Therefore the T quartz is used, together with the cations geothermometers for estimation of the reservoir temperatures. The findings on the reservoir temperatures are encouraging and warrants for further geothermic investigations, however drilling may confirm the exact temperatures.

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