An open cut coal mine was modelled using computerised acoustic modelling techniques over a 6 kilometres radius around the mine. (The modelling included internal mine topography and mining equipment). Another consultant claimed the mine would not exceed 40 dB(A) beyond the 2¼ kilometres radius. Our modelling showed this noise level was exceeded at over 3½ kilometres from the mine. See diagram for details.

The model provided a full noise frequency spectrum of both the total and the component noise sources, along with a ranking of the noise sources. This information proved invaluable in identification of the problem noise sources and for implementation of an engineered solution.

Our predicted noise level contours were shown through actual field environmental noise monitoring to be accurate to within ±2 dB(A). This was also confirmed through an independent field monitoring programme. Designs were then provided and solutions modelled to overcome this problem.

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