Heavy metal contamination in coastal environments affects the nutritional quality of marine organisms. Bangka Island, a major tin-producing region in Indonesia, has ex-tin mining areas where post-mining activities contribute to heavy metal runoff. This study aims to determine levels of Cadmium (Cd) and Copper (Cu), amino acid profiles, and proximate composition of Laevistrombus canarium, Anadara granosa, and Geloina erosa collected from three former tin mining sites (Anak Air Island, Batu Belubang, and Kurau). Sediment from Anak Air Island was dominated by silt (46.45%), while Batu Belubang and Kurau were sandy (94.61% and 94.03%). Batu Belubang had the highest TOM (17.94%) and heavy metal concentration (Cu:5.70; Cd:0.03 mg/kg). A. granosa had the highest Cd (0.21 mg/kg), and L. canarium was dominated by Cu (5.70 mg/kg); all levels remained below safety thresholds. Nutritional analysis showed L. canarium had the highest protein content (16.29%) and carbohydrate content (5.27%). Lysine (5.25%), phenylalanine (6.85%), and leucine (4.07%) were dominant essential amino acids (EAA) in L. canarium, A. granosa, and G. erosa, respectively. Non-essential amino acids (NEAA) were dominated by glutamate (8.97-10.79%) in all species. Prevalence of metal-binding amino acids (e.g., glutamate, lysine) may reflect a biochemical adaptation to contaminated environments. These findings suggest that environmental factors influence both the accumulation of heavy metals and the nutritional profiles of mollusks.