Abstract: Gold element of an altered cataclastic rock type gold ore mainly exists in form of naked or semi-naked gold. The tests are carried out to study the appropriate technical parameters for flotation of the ore. The results show that under the grinding fineness of -200 mesh 65%, and with the combining collector of ammonium dibuyldithiophosphate+butyl xanthate, final gold concentrate with Au and Ag grade of 72.19 g/t and 67.64 g/t, Au and Ag recovery of 96.00% and 72.07% was achieved respectively by the process of one roughing-two cleaning-two scavenging-middles back to the flow-sheet in turn.

Key words: Gold ore, Naked gold and Semi-naked gold, Flotation