Optical, backscattered electron, secondary ion, and high-precision transmission electron microscope image analyses of samples containing moderate to high gold concentrations in sediment-hosted micro-disseminated gold deposits indicate that gold is strongly correlated with As on a microscopic scale. The ratio of Au/As varies in the deposits, but a positive correlation is present in any given sample. Both elements are present primarily as arsenian pyrite overgrowths and ar-senopyrite. The author has found that gold occurs usually in small chain balls of its natural form with a size of submicron-grade in arseno-bearing sulfides. The deposition may have been so rapid in these high-grade areas that submicro gold occurs in the arseno-sulfide structure as small native gold grains.