stone-dust barrier

stone-dust barrier

[′stōn ¦dəst ′bar·ē·ər]
(mining engineering)
A device erected in mine roadways to arrest explosions; consists of trays or vee troughs loaded with stone dust, which are upset or overturned by the pressure wave in front of an explosion and the flame, producing a dense cloud of inert dust which blankets the flame and stops further propagation of the explosion.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.