Shahrood University of Technology Journal of Mining and Environment 2251-8592 16 4 2025 07 01 Estimation of Button Bit Drillability Index on Granitic Rocks using their Mineralogy Composition and Rock Strength 1237 1251 3430 10.22044/jme.2025.15185.2901 EN Patrick Adeniyi Adesida Department of Mining Engineering, Federal University of Technology, Akure Nigeria Mecânica, Universidade Estadual Paulista, Ilha Solteira, Brazil Sunday Adex Adaramola Department of Mining Engineering, Federal University of Technology, Akure Nigeria Journal Article 2024 10 07 This study focuses on predicting the drillability of granitic rocks—precisely the wear rate of button bits, by integrating rock strength and mineralogical properties. The objective is to develop a predictive model for bit wear rate using a Rock Engineering System (RES) approach. Key rock parameters (uniaxial compressive strength, porosity, specific gravity, and the mineral content of quartz, plagioclase, hornblende, and biotite) were analysed via a RES interaction matrix to derive a new Drillability Index capturing their combined influence. This analysis revealed that UCS and porosity are the most influential factors in the system. The resulting RES-based model correlates strongly with observed bit wear rates, achieving a high coefficient of determination (R² ≈ 0.93) and low prediction errors (RMSE = 2.79, MAE = 2.14). The MAPE (= 38%) indicates a marked improvement in accuracy over traditional regression methods. Integrating mechanical and mineralogical factors is a novel approach to drillability prediction, providing a more comprehensive account of rock characteristics than conventional models. Validation results show that the RES-derived Drillability Index reliably predicts field performance, offering practical value for optimising drilling operations and guiding geomechanical analysis. Additionally, the study proposes a drillability classification scheme to further support the field application of the findings. https://jme.shahroodut.ac.ir/article_3430_0560be906d3828bdce3165617494557c.pdf