An overseas gold ore has high sulfur content.Pyrite and arsenopyrite contents are high.Gold is wrapped in form of microfine particles in sulfide minerals.Based on the ore properties,an experimental study on the process of flotation-concentrate re-grinding and re-processing is carried out.The results show that under optimal conditions,the closed circuit test can obtain gold concentrate 1 with a gold grade of 25.01 g/t and a gold recovery rate of 72.74 %,and gold concentrate 2 with a gold grade of 11.06 g/t and a gold recovery rate 21.18 %.The research result can provide technical references for the development and utilization of the gold ore resources and can be used as a reference for the mineral processing selection of other gold ores of the same type.