In this study a sampling survey was carried out in JSC Madneuli copper flotation plant to improve metallurgy by using process mineralogy. Size-by-size mineralogical analyses were performed for some critical streams around rougher, scavenger and cleaner banks by optic image analyzer system. With quantitative data, it was possible to indicate the reasons of dilution in the final copper concentrate and copper loss in the tail. It was found that 18.2% of total copper was lost from tail particularly from finest size as chalcocite. Also, batch flotation tests of some critical streams were performed during and after the sampling survey to evaluate the efficiency of the operating conditions in the plant. These tests showed that increasing the residence time and adding extra collector will result in an increase up to 20% of copper recovery improvement in scavenger bank while it will be 95% in cleaner bank without any decrease in grade. Based on the mineralogical results, regrinding was proposed for particularly cleaner tail as it consisted of mostly coarse and locked particles.