<p>Mine planning is a crucial part that can profoundly impact a mining project’s success, especially for small and medium-scale underground operations. The main source of information for such projects is geological exploration core drilling, as it provides crucial data on the mineral composition of rocks in the earth’s crust, enabling subsurface resource assessment and decision-making. However, some essential data in these drill holes are often underutilized, particularly the analysis of the geomechanical properties of rocks. Neglecting this information can significantly impact the planning process and then the overall profitability of the project. This paper suggests a methodology that integrates the information extracted from core drill holes through simplified decision-making tools as input for mine planning. This was made possible by developing a weighted mathematical model to assign scores to different zones of the deposit based on three main criteria: economic potential, ease of access, and the geomechanical properties of the ore and its host rocks. The results, applied to a silver vein deposit, showed a varied distribution of zones according to their importance and enabled classification into four priority classes: A, B, C, and D. This method provides a practical approach, especially for mines with limited access to technical planning tools, considering multiple factors that impact underground mining projects and their sustainability.</p>