Flotation of antimony-bearing minerals in a complex sulphide ore from the Rakkejaur deposit has been studied in laboratory experiments. Microprobe equipment has been used to distinguish the various types of antimony mineral present in the flotation products. The results show that effective depression of the iron-rich antimony minerals can be obtained on flotation in a lime alkaline environment at pH 11.5 without increasing the losses of silver. These antimony minerals float more strongly at about pH 5.