This report presents an evaluation of the acoustic imaging technique to determine the effect of underground environment on the sound pressure level of coal mining equipment. The equipment includes continuous miners, cutting machines, coal drills, loading machines, shuttle cars, roof bolters, and locomotives. The report presents the procedure for obtaining the aboveground and underground measurements, an analysis of noise sources, an assessment of the acoustic imaging technique, and the effect of loading on sound pressure levels. The acoustic imaging technique involves obtaining a value by adding the energy level of the direct sound wave and the energy levels of the reflected sound waves due to tunnel surface to a given source. The obtained value represents the theoretical increase in sound pressure level due to the underground environment. The report concludes that the acoustic imaging technique appears to give good predictions of noise level increases due to the underground environment.