The Mine Safety and Health Administration (MSHA) issued a new Serious Accident Alert. On Dec. 11, 2017, miners were preparing for a shot. The miners were positioned about 130 yd. from the face.
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Vari-Stem Contains Explosive Energy Within Rock Mass
Vari-Stem Plugs work by creating a blocking effect within the drill hole by wedging the stemming material between the drill hole wall and plug. Upon detonation of the explosives, the plug is forced upward into the stemming material and “locks up.” The explosive gases and energy are prevented from traveling (venting) up through the drill hole, and instead are contained…
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