Oresome Products Pty Ltd
Blast energy can be divided into two components:
1. Applied energy – shock & heave energy used in material breakage;
2. Lost energy – manifests itself as air over-pressure, ground vibration & excess fines (over-blasted material).
Stemming is inert material used to confine energy in the blast hole at the top of the explosive charge. Insufficient or inefficient stemming allows the blast energy to prematurely vent at the collar, reducing the energy applied to breaking & moving the rock mass. Stemming ejection is a common cause of lost energy in the blast, especially when drill cuttings are used. The Vari-Stem® plug is patented & proven technology deployed globally in mining & quarrying applications to maximise applied energy. Vari-Stem® reduces processing costs by achieving tangible increases in fragmentation in the stemming area. Independent studies show the Vari-Stem® plug can increase blast patterns with the same fragmentation for major savings in drilling and explosive costs, proving that Vari-Stem® plug is a cost-efficient means of reducing costs in blasting and processing.