Abstract: The micrite type antimony-containing gold ore in Guizhou is in blocky construction.Its metallic minerals are mainly pyrite and goethite，with content of less than 1%.Non-metallic minerals are calcite，and few of quartz，organic matter，etc.It contains gold of 6.04 g/t，and natural gold grains were not seen in microscope，74.34% of the gold occurred in sulfide ore，free gold accounted for only 7.14%，wrapped gold in silicate and carbonate accounted for 11.96% and 6.56% respectively.Antimony mainly existed in the form of stibnite.Bulk flotation process was studied to make high efficient recovery of gold and antimony at low costs.The results indicated that，at the grinding fineness of 71% passing 0.074 mm，through one roughing and two scavenging bulk flotation，one roughing and two scavenging bulk flotation after regrinding the tailings to 92.7% passing 0.074 mm，three cleaning flotation for the two mixed rough concentrate，and then middles back to the flow-sheet in turn，rough gold-antimony concentrate with gold grade of 47.60 g/t and recovery of 76.88%，antimony grade of 9.81% and recovery of 85.22% was obtained with good bulk floatation performance.Gold recovery from tailings and separation process of gold and antimony will be further described in another paper.

Key words: Micrite gold antimony, Stage grinding and separation, Mixed flotation, Wrapped gold in sulfide, Free gold, Stibnite