What are the major sources of noise in underground mining, highlighting the permissible levels of noise in those? The ambient noise level of the underground mining area is affected by the operation of the cutting machines, tub/conveyor movement and blasting of the coal. The movement of coaling machines and transport units-conveyor, tubs and transfer points caused audible noise which becomes disturbing underground because of the poor absorption by the walls. Classify mine fires. Fires underground can be classified into two broad groups, open and concealed fires. Open fires occur in airways, faces and other openings that form part of the active ventilation system of the mine and, hence, affect the quality of the mine airflows quickly and directly. As the term might imply, open fires are often accompanied by flaming combustion because of the availability of oxygen and offer the possibility of a direct attack by fire fighting teams. Conversely, concealed fires occur in areas that are diff
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