The performed tracer-gas tests proved the existence of fissure connections between the gobs of the seam 418 at the 500-m level in the colliery M and the gobs of the seam 510D as well as the methane-drainage road 1 East in the seam 418 at the level of 665 m in the colliery W. The tests with the use of the SF_6 tracer gas confirmed results of an earlier survey of ventilation potential of the portion of the ventilation sub-system of the southern ventilation shaft of the colliery M (the results and their analysis are in possession of the colliery). Identification of the airflow direction by means of the tracer gas clearly showed its migration from the seam 419 in the colliery M towards the seams 418 and 510D located in the taking of the colliery W.
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