Mossbauer spectra of 57Fe probe atoms in the spinel Co2.94Fe0.06S4 indicate the existence of a magnetic transition at Ttr ~ 95 K in the parent phase Co3S4. The spectrum observed below Ttr consists of a six-line magnetic spectrum and a two-line quadrupole spectrum. Above Ttr the six-line spectrum collapses to a single line superposed on the two-line quadrupole spectrum. Consideration of the Mossbauer parameters and of the area ratio of the component spectra suggests that the atomic occupancy of the spinel lattice is [Co0.968Fe3+(HS)0.032][Co0.968Fe2+(LS)0.014]2S4, the Fe atoms having preference for the tetrahedrally coordinated cation sites.