a portable rock dust blowing apparatus comprising a wheel or skid supported framework upon which is mounted a blower designed to derive it &# 39 ; s driving power from a belt engaging roller which is also supported on the framework . also mounted on the framework is a pair of inverted u - shaped channel members which are employed for adjusting the framework relative to an endless belt travelling under the framework . a hopper for containing a rock dust or the like is used along with the aforesaid apparatus whereby the blower assembly will be employed for directing the rock dust on to the walls , ceiling and floor of a mine tunnel or shaft by one utilizing the rock dust blower of the present invention .