Abstract: A gold-bearing polymetallic sulfide ore was found in Shanxi. The main metallic minerals are electrum， pyrite， followed by sphalerite and galena， a little chalcopyrite， etc. The main gangue minerals are quartz， followed by potassium feldspar， sericite， etc. Electrum is the most important gold mineral， silver-bearing sulfide ore is the most important silver mineral， galena is the most important lead mineral， sphalerite is the most important zinc mineral. The main gold and silver carrier mineral is pyrite， which dissemination size is coarse. Gold， silver， lead and zinc resources was recovered by the on-site process of primary flotation process of gold-lead bulk in alkaline environment， and then zinc flotation. The recovery of gold was low， and the mutual content of lead and zinc concentrate is serious. In order to determine the efficient and reasonable development technology of the ore， beneficiation experiment was conducted. Results show that the ore at the grinding fineness of -0.074 mm accounting 65%，by the process of gold gravity separation via Nielsen concentrator， in weakly alkaline environment gold-lead bulk flotation from gravity tailings with one-roughing， one-cleaning and one-scavenging， gold-lead mixed concentrate separation with one-flotation， zinc flotation from gold-lead bulk flotation tailings with one-roughing， tow-cleaning and one scavenging， and the middlings back to the flowsheet in turn. Gold concentrate by gravity with gold grade of 264.53 g/t， silver grade of 1 042.50 g/t， gold recovery of 49.67%， silver recovery of 5.67%； gold concentrate by flotation with gold grade of 42.35 g/t， silver grade of 998.36 g/t， lead grade of 21.31%， gold recovery of 24.78%， silver recovery of 16.93%， lead recovery of 23.61%； lead concentrate by flotation with lead grade of 59.61%， gold grade of 23.10 g/t， silver grade of 3 745.20 g/t， lead recovery of 63.08%， gold recovery of 12.91%，silver recovery of 60.68%； zinc concentrate with zinc grade of 46.35%， zinc recovery of 88.21% was finally obtained. The process effectively recovered gold， lead， zinc and silver resources in the ore， and realized separation from each other. Addition of Nielsen concentrator for recovered gold in front of flotation， weaker alkaline environment and more efficient zinc mineral inhibitor TQ11 are the key to realize the high efficiency recovery of gold and solve the problem of lead and zinc concentrate mutual inclusion.

Key words: Gold-bearing polymetallic sulphide ore, Gravity of Knelson concentrator, Gold-lead bulk flotation, Zinc inhibitor TQ11