An assessment of rock material was carried out in this study to determine the wear resistances of drill bit due to physical properties of granite and old alluvium. This study intends to provide a current state of-the-art comparison of petrographical analysis and interpretation of F-Schimazek’s value in terms of its drillability rate and the wear and tear of the drilling tools. Rock samples representing the drilling locations were collected and tested for its physical and mechanical properties in the laboratory. The FSchimazek’s value is obtained from a number of easily measured parameters namely Brazilian Tensile Strength, mineralogical composition and grain size. In this study, samples of old alluvium were collected from drilling project prepared for blasting work from an interchange project at Gelang Patah, Johor, Malaysia. Besides that, samples of granite were collected from Maktab Rendah Sains Mara (MRSM) Project at Bandar Sri Alam, Masai, Johor for the same purpose. The results are then analyzed with the rate of penetration measured during the drilling work. The result shows a good relation between the parameters involved and the methods are simple and practical to be employed for the drilling assessment.