Pulse Infusion Shotfiring

Inducer shotfiring is considered to be the oldest and most widely used method to control outbursts in mines, and it was initially developed in France by the end of 19th or beginning of the 20th Centuary in the Gard coalfield. Blast holes are drilled into the face and loaded with charges. The charge delivers a short intense shock wave to the strata, which may trigger outburst, Stress relief is accomplished whether an outburst occurs or not by the fracturing of the blast area, transferring high stress concentrations to an area farther in advance of the face. Danger from outburst occurring under such circumstances is minimal since mine personnel and equipment are evacuated from the area.
The Inducer shot firing can be very effective in reducing outburst hazards, and since its development the methods found applications in various European coalfields, Canada, Japan and also in Australia. The application of inducer shotfiring has been practiced in a number of Australian mines, and in particular, there is several documented reporting of the practice by various researchers from Metropolitan Colliery, NSW and Collinsville, Queensland (Chap 5, Lama and Bodziony, 1996) (Click).
A major concern with this technique as used throughout Europe and as was used at the Metropolitan Colliery is the apparent increase in the number of outbursts in a particular mine over and above what was previously or usually the case, and irrespective of the gas type. Such reporting is in agreement with the perceptions held various researchers that inducer shotfiring has negative impact on coal permeability outside the immediate fractured boundaries of the coal seam