The major sources of heat in coal mines are the heat that comes out from the rocks surrounding the walls of narrow passages, and the compression heat that arises by reason of the flow of wind upwards and downwards at the time of transportation of the coal, the heat that arises from the electrical and mechanical devices that are operating, the heat that comes out as a result of oxidation.

Mines are excavated from a depth of approximately 925m. Since the ambient temperature is above 37C, these fields are classified as secondary in terms of temperature hazard. The system is mainly composed of ice production, transportation and transfer on the ground.

The cold transportation and transfer system located underground is designed as an open system or the returning water is transferred again to the ice melting pool and when the dust preventative water in the mining field is used at a little quantity, the cold water is obtained from the water supply pipeline. This water is used to prevent the accumulation of ice on the work counter and the temperature is lowered by way of spraying method and the ambient temperature underground is reduced efficiently. This causes high productivity.