The two conductive zones C1 and C2 form a thin conductive layer near the surface covering the Mae Chan valley (Fig. 5a) but separate into two zones below 50 m depth (e.g., Figs. 5b and 6a). C1 conductor dissipates at around 250 m while C2 continues to a depth of 500 m (Fig. 6a). C2 covers a larger area (around 1 km 2). C1 and C2 are located within the Quaternary alluvium. The center of C1 is close to where the hot springs seep into the Mae Chan creek (indicated by Y1 and Y4 in Fig. 5) and also the drilled hole (indicated by Y2),while the center of C2 is associated with hot fluid emerging at the surface. Two hot springs (Y3a and Y3b) are also found between C1 and C2. Since there is a correlation between the hot springs and the conductors beneath, we can therefore suggest that C1 and C2 are reservoirs for the hot fluid. The reservoirs are connected in the top sedimentary deposits in the north of MCF (Figs. 5a, 6 and 7). They
become separated on entering the weathered and fractured granite below (Figs. 6 and 7).