A coal preparation plant was selected to demonstrate various noise control techniques and materials in a commercially operating plant. At the start of the project, the 1,650-ton-per-hour plant was surveyed to document the existing sound levels and worker noise exposures. On the basis of the survey, individual noise sources were characterized and assigned priorities for treatment. Four categories of noise control treatments were installed in the plant: resilient impact pads, curtains, chute liners, and resilient screen decks. Resilient impact pads and curtains that were available in 1977 were suitable for general use in coal preparation plants, and they provided significant noise reduction. The overall performance of the chute liners, which also provided useful noise reduction, was strongly dependent on the specific installation. Although the resilient screen decks have the potential for 7 to 9 dba of coal- screen impact noise reduction, blinding and delamination encountered at the plant represented major design problems. This program achieved noise reductions up to 10 db in various areas of the plant resulting in significant reduction in worker noise exposures.