<p>Slope stability is a critical concern in open-pit mining operations due to the large excavated slopes and complex geological conditions encountered during mining activities. The stability of these slopes depends largely on the geotechnical properties of rock and soil materials forming the pit walls. Parameters such as cohesion, internal friction angle, unit weight, and discontinuity characteristics play a major role in determining slope behaviour under gravitational and operational loads. This study examines the influence of geotechnical material properties on slope stability in open pit mines and evaluates typical stability conditions using factor of safety analysis. Laboratory and field-derived geotechnical parameters were used to assess slope stability under different slope heights and material conditions. The results indicate that rock mass strength and discontinuity characteristics significantly influence slope stability. Proper characterisation of geotechnical materials is therefore essential for safe slope design and long-term stability in open-pit mining operations.</p>