This paper describes research by the Bureau of Mines to identify and control the excessive noise of chain conveyors. The major noise source is the impact of the chain on the tail roller on the upper and lower decks. Abatement technology has emerged in the form of constrained layer damping for the conveyor decks, vibration isolation, and a reduction in structural discontinuities. A newly constructed conveyor test bed assembly was used to create and control a wide range of test conditions not possible in the operating environment of an underground mine. The effects of chain speed, the shape of the discontinuity, the type of chain, and chain tension on the noise level were investigated. It is anticipated that a model based on single impact analysis will be developed to predict noise level as a function of the various parameters under study. The advantages of a variable-speed conveyor were also explored.