Abstract:Process mineralogy for products from mineral processing can give a direction to technology improvement when changes of ore property happen, or when optimization and reconstruction of dressing plant is necessary. In a Cu-Pb-Zn-Sn polymetallic deposit in Inner Mongolia, percentage of loss for Ag and Cu is 13.10% and 15.64% respectively in the part of Zn-S bulk flotation. To maximize resources comprehensive utilization value, a process mineralogy study has been done focus on Zn-S bulk concentrate. Through occurrence study, the target minerals of silver and copper are indicated. Because of their close relationship, it is possible to concentrate Cu-minerals and Ag-minerals together. Based on above results; and also the liberation degree of tetrahedrite, chalcopyrite, and Cu-minerals assemblage, which is 12.84%, 33.65% and 25.40% respectively; the grain size distribution of Cu-minerals assemblage, which is coarse, a technical proposal is proposed, which advices through add re-grinding work focusing on Cu-minerals assemblage into process to achieve a Ag-Cu concentrate. The beneficiation tests show that a high grade Ag-Cu concentrate can be achieved through increase re- grinding fineness.