Climatic conditions in the underground workings of highland mines in the Polar region have a significant impact on mining processes, as they lead to freezing of ore in ore chutes and outlets. One of the main causes of ore freezing should be considered the temperature and air regime of the mine. Cold air inflows along the path of the ventilation jet reduce its temperature. Cold air passing through wet beaten ore accelerates the heat transfer process. In addition, negative air temperature in underground workings serves as a source of colds of miners, causes freezing of air and water lines, is the cause of increased dustiness of the mine atmosphere.

The Zapolyarny mine widely uses high-performance mining systems with massive ore collapse when mining a thick gently dipping ore deposit. This is associated with the need to detonate large explosive charges during ore breaking and drawing and, consequently, with the contamination of the atmosphere of underground workings. To organize effective ventilation of stoping blocks, a properly designed ventilation scheme and systematic control of the causes of deterioration of atmospheric conditions at workplaces are important. ...

In the ventilation network of any mine, part of the total unproductive air flow is lost in the area of the main fan units. This category of leaks always has the greatest negative impact on the mode of operation of fans and the efficiency of ventilation of underground workings. In the harsh climate of the Polar region, suction of outside air in winter causes intensive freezing of ducts, shut‑off devices and fan impellers. The applied methods of sealing ventilation structures do not completely eliminate external air losses. Therefore, when choosing the main ventilation fans, these losses must be taken into account. ...