Coal plays a very critical role in developing countries in meeting their energy demands. Consequently, coal mining becomes essential to sustain the energy demands in these countries. At the same time, mining industry is plagued with many problems which primarily impacts the mine worker’s safety. The underground mine environment is hazardous due to the presence of toxic gases like NO2, CO, CO2 etc. Concentration of these gases above the threshold limits seriously impair the mine workers’ health and life. The stringent environmental and safety standards of the 21st century makes it mandatory to ensure safe working conditions. Hence continuous monitoring of concentration of these poisonous gases becomes the need of the hour. In this paper a survey on various mine monitoring systems are discussed.
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