Breaking big rocks into little rocks is a noisy process but engineering controls can lessen the volume of noise one might hear near a mine site.
Noise pollution is regulated by the IEPA and noise levels are required to be in compliance with State law. Using scientific evidence, the IEPA decides on safe levels of noise from emission sources such as the manufacturing industry and the mining industry.
Mining operations typically have earth berms, trees, shrubs, etc. that provide more than adequate noise attenuation at the property boundaries. In addition, the Mine Safety and Health Administration requires mining companies ensure miners are not exposed to excessive levels of noise beyond the permissible expose level established by Federal rule.