Saint-Petersburg Mining University, Saint Petersburg, Russia:

Simakov A. S., Associate Professor, Candidate of Engineering Sciences, as.simakov@yandex.ru
Byzova A. A., Master

One of the key objectives of mine safety is the continuous control of gas concentrations in mine air. Chemical composition of mine air depends on geological conditions, mining technology and type of mining equipment. The main sources of chemical contamination of mine air are gas emission from rock mass, oxidation processes, blasting and operation of mining machines. The presence of personnel in underground tunnels should be allowed with regard to the mine air content of oxygen, hydrogen and harmful gases. A harmful gas is methane that accumulates in closed spaces and is explosive. Methane concentration in the air of operating underground mines can never exceed maximum allowable values. The mine air content of oxygen is to be not less that 20% and hydrogen content cannot be higher than 0.5% (by volume).

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