Abstract: A gold ore contains gold 198 g/t,and disseminated grain size is coarse,79% gold exsists in form of exposed and semi exposed gold.To rational exploitate and utilizate the gold ore resource,beneficiation experiment was conducted.Results show that,Knelson concentrator was suitable to recycle coarse gold in the ore and flotation with butyl xanthate and ammonium dibutyl dithiophosphate combined collector recover gold from gravitation separation tailings.At the grinding fineness of 69.8% passing 0074 mm,via one roughingtwo cleaning gravitation separationgravitation separation tailings one roughingthree cleaningtwo scavenging closedcircuit flowsheet,gravitation separation concentrate wtih gold grade of 5 25000 g/t,recovery of 5303% and bulk concentrate (gravitation separation middlings and flotation concentrate combined) wtih gold grade of 4126 g/t,recovery of 4252% were obtained.beneficiation index was good,and high efficiency recovery and utilization of the gold ore resource was realized.

Key words: Gold Ore, Knelson concentrator, flotation