Abstract:In view of the unstable production in the beneficiation process, frequent shutdown and overhaul of SAG mill, high consumption of materials and energy of a gold ore in Liaoning Province. Technological upgrading is planned regarding crushing- milling process for the existing plant, while the subsequent flotation process remains unchanged. The upgrading scheme adopts three-stage of crushing with two closed screening in limited space. Ore conveying, crushing and screening equipment are added by using space elevation difference, which can effectively reduce site area of the plant, and is very suitable for the concentrator with limited industrial site. The production practice shows that the consumables and power consumption index of the concentrator are significantly reduced by this technological upgrading. The concentrator was put into operation in September 2016 and has been in normal operation.