Pit & Quarry, January 2016
EVOLUTION SERIES DRI LLING AND BLASTING 1935 Du Pont made some advancements to its Nitramon blasting agent to improve safety convenience and efficiency in blasting 1959 Cleveland based Austin Powder Co s detonating fuse came in three different types to help with various blasting applications 1969 TOP LEFT A primer with an MS delay electric blasting cap inserted in it is lowered down the borehole Water gel explosives and sticks of dynamite will follow it down the hole BOTTOM LEFT This water gel explosive flows down a borehole rapidly past constrictions and completely fills the hole By using water gels Massachusetts Broken Stone Co expanded a shots drill pattern which resulted in reduced blasting costs and effective rock fragmentation TOP RIGHT A powder man loads the dynamite 3 in x 18 in down the borehole A typical shot at Massachusetts Broken Stone Co quarry usually consist of 50 holes drilled on an 11 ft x 11 ft pattern 4 in in diameter and 36 ft deep BOTTOM RIGHT A close up view of the rock fragmentation resulting from the use of water gel explosives The small diameter of the rock will be ideally suited for the operations primary crusher and no secondary blasting will be required www pitandquarry com January 2016 PIT QUARRY 19
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