Ion-adsorption rare earth deposits developed on deeply weathered granitic massifs represent a distinctive mineralisation style associated with tropical saprolite profiles. In regions such as the Serra Dourada Granite in central Brazil, prolonged chemical weathering produces a thick regolith composed of laterite, saprolite, and transitional W2–W3 horizons that host clay-bound rare earth elements (REEs). These materials originate from in situ granite decomposition, preserving relict mineralogy while exhibiting high degrees of chemical alteration, with chemical index of alteration (CIA) values commonly exceeding 70–80 per cent. Their geotechnical behaviour is controlled by intense fracturing, high porosity, variable cementation, and pronounced vertical stratification inherited from the weathering profile. Because ion-adsorption clays are extracted at shallow depths, mining operations typically rely on the formation of temporary working platforms within narrow valleys or amphitheatre-shaped depressions. The geometry and geomechanics of the saprolite impose strict constraints on the stability of these operating surfaces. The material displays a heterogeneous fabric, ranging from loose, dispersive zones in upper horizons to denser, partially cemented saprolite near the bedrock interface. Variations in structure and suction conditions lead to distinct responses in shear strength, deformation, and moisture-induced softening. Under wet seasonal conditions, reductions in matric suction may cause significant strength losses, particularly in clay-rich horizons. To ensure safe excavation and trafficability, valley-bottom platforms must often be founded on more competent saprolite or weathered granite, with removal of weak colluvial or lateritic layers. Numerical assessments and field experience indicate that shallow platforms are sensitive to pore-pressure generation and deformation under operational loading and seasonal infiltration. Effective stabilisation measures include excavation to competent saprolite, drainage control, localised compacted pads, and continuous monitoring of pore pressure and displacement. Overall, the geotechnical behaviour of granitic saprolites reflects the interaction between tropical weathering, clay-ion adsorption processes, and shallow mining geometry. Understanding this coupled system is essential for designing stable extraction platforms and ensuring safe exploitation of rare-earth-bearing saprolitic horizons.