Abstract: There exists many problems such as low recovery，highly collector consumption，sticky and too much foam in dealing with a tuff-type copper oxide ore with sulfuration flotation process in Dishui county，Xinjiang province.In order to provide reference for dealing with these issues，the process mineralogy research was conducted by the means of chemical analysis，X-ray diffraction (XRD)，optical microscopy，scanning electron microscope (SEM) and electron microprobe analysis，grading analysis and specific surface area analysis etc.The results showed that the tuff rock consists of vitroclastic fragments，crystal fragments and rock fragments etc.Large blocks of tuff with many internal pores were formed by large quantities of volcanic dust filling and cementing with the fragments.Copper mainly exists in the form of malachite and zigueline，which is difficult to sulfurize.Particles below 0.02 mm accounted for 65.59% at the grinding fineness of 90% passing 0.074 mm.Those slimes not only worsen the flotation process by covering on the copper minerals but also cause non-selective adsorption of reagents for their large specific surface area.Based on the research results，the ways for solving these on-site problems include intensifying the sulfuration of zigueline，reducing the covering of slimes and decreasing the activity of slimes.

Key words: Volcanic tuff, Copper oxide ore, Process mineralogy, Sulfuration flotation, Slime