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Pergau Dam as the largest hydroelectrical generation station in Peninsular Malaysia within a mountainous region; is supplied by many flowing river as its intakes. Previous researches within Pergau area mostly focused on biodiversity while this research was to carry out baseline investigation on the minerals present in the intakes sediment of Pergau Dam through surface sampling. Through stereoscopic observation, assemblages of quartz, plagioclase, feldspar, muscovite, and biotite minerals in sediments implies a granitoid source rock. By computing X-ray Fluorescence (XRF) chemical compositional data of sediments into chemical weathering indices, overall weathering condition of Pergau Dam intakes area are unweathered to low chemical weathering intensity. Through Combination of XRF data and X-ray Diffraction (XRD) patterns of mineral phases, detailed mineralogy of plagioclases, K-feldspars, sericites, chlorites and accessory minerals such as epidotes, zircon and monazite were identified. Mineral assemblage and Streckeisen Diagram plots indicate the granitoid source rocks of the sediments are quartz monzorite and quartz monzodiorite.