Abstract: Certain cyanide leaching tailings in Guizhou contain 1.66 g/t of gold,primarily existing in the forms of exposed gold and sulfide-encapsulated gold.The tailings have a high fineness,with particles of -0.038 mm accounting for over 80 %.Given the high slime content of the cyanidation tailings,a sand-slime separation process was employed.Cyclones are used for grading and flotation is performed for the recovery of the underflow and overflow separately.A closed-circuit test with roughing once,scavenging twice,and cleaning three times was conducted,with process parameters and reagent regimes tailored to the characteristics of the underflow and overflow.The sand-slime separation process achieved a concentrate with a gold grade of 12.42 g/t and a gold recovery rate of 50.13 %,while the ungraded flotation process of the cyanidation tailings produced a gold concentrate with a grade of 9.49 g/t and a recovery rate of 38.10 %.The results indicate that the sand-slime separation process improved the gold grade by approximately 2.9 g/t and the gold recovery rate by about 12 percentage points,effectively recovering gold from the cyanidation tailings.