The Hillgrove Project, australia's largest antimony mineral resource, has a long mining history dating back to 1857. Now entering a new phase of development following significant resource upgrades by Larvotto Resources, the project presents an opportunity to maximise value through modern mineral processing strategies. as part of the feasibility study, comprehensive mineralogical analysis was conducted to support the design of an efficient and selective flotation process for this complex antimony-gold system. High-resolution characterisation using TESCaN Integrated Mineral analyzer (TIMa), combined with targeted gold deportment studies, provided critical insight into mineral associations, textural complexity, and liberation behaviour. TIMa identified pervasive fine-grained intergrowths among stibnite, pyrite, arsenopyrite, and gangue minerals. Fine silicate inclusions within stibnite grains were shown to limit liberation, informing the selection of an optimal grind size to enhance recovery while managing downstream processing challenges. Gold deportment results quantified the portion of free-gold, gold associated within stibnite and gold locked in other sulfides, highlighting opportunities and directions for selective processing. In addition, the presence of antimony oxide in flotation tailings was identified as a recoverable loss pathway. The study demonstrates how detailed, early-stage mineralogical characterisation can drive smarter processing decisions and decrease the risk of flow sheet development. By combining TIMa mineralogy with gold deportment data, the project team gained valuable insight into the mineralogical controls on recovery, enabling more selective and effective flotation design. This case study highlights the value of modern mineralogical tools in unlocking the full potential of complex polymetallic ores, and their critical role in guiding successful project development.