T This study evaluated the stability of the kolaka 3 south, kolaka 3 east, and biti pyramid slopes at pt indrabakti mustika through rock mass characterization, kinematic analysis, and 2d and 3d modeling. data included pit mapping, 24 window-mapping stations, laboratory testing, topography, and geological models. rock mass quality was determined using rmr, smr, and gsi, while slope stability was analyzed deterministically and probabilistically using dips, slide2, and slide3. rocky saprolite was classified as smr class iv (poor), whereas saprolite rock was generally classified as smr class iii (normal). kinematic analysis indicated a direct toppling tendency; however, without a critical basal plane, the instability was interpreted as localized block failure within a blocky rock mass. most initial 2d geometries did not meet the criteria of the minister of energy and mineral resources decree no. 1827 k/30/mem/2018. after resloping, all sections met the criteria, with the lowest static factor of safety (fos) of 1.484, the lowest dynamic fos of 1.130, and the highest probability of failure (pof) of 0.542%. the 3d modeling showed that kolaka 3 east met the criteria, whereas the other two slopes did not. the 2d analysis evaluated local stability, while the 3d analysis represented the spatial stability of the actual geometry. the resloped geometry was verified only in 2d.