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    Dec 11, 1973· Rock breaking equipment as claimed in claim 4 in which the rotor is made as a single casting carrying hammers in at least the outer rows thereof which are mirror images of each other. Description: This invention relates to equipment for breaking rock particularly in mining operations.

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    A COMPARISON OF NONEXPLOSIVE ROCK BREAKING TECHNIQUES. Caldwell T. Placer Dome Asia Pacific, Brisbane, Queensland, Australia SYNOPSIS Increasing pressure on mining and related industries has led to the investigation into methods of excavation that will reduce the impacts on the surrounding environment. This may be

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    Drilling and blasting is the controlled use of explosives and other methods such as gas pressure blasting pyrotechnics, to break rock for excavation. It is practiced most often in mining, quarrying and civil engineering such as dam, tunnel or road construction. The result of rock blasting is often known as a rock .

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