Abstract: An oxidized gold ore contains gold up to 7.76 g/t，but the gold recovery is highly undesirable by adopting the flotation process. Tests on the technical conditions of grinding fineness，sodium cyanide consumption，leaching time through segment leaching process are carried out，by which Cu ions that affects the gold leaching are pre-treated. The test results show that the ammonia pretreatment before leaching is conductive to weaken the negative impact of copper on gold leaching. Under the optimum conditions obtained from the above tests，gold leaching rate reaches 90.11%，which can meet the requirements of industrial production.

Key words: Oxide gold ore, Cyanide leaching, Segment leaching, Ammonia pretreatment