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Evaluation of Conventional Drill and Blast and Using a Mechanical Roadheader to Excavate the Impumelelo Decline Shaft Kgomotso Mokoena (0614089 G) Presented in partial fulfilment of the requirements for the degree Eng. (Mining Engineering) In the School of Mining Engineering Faculty of Engineering and the Built Environment University of the Witwatersrand July 2010 Declaration: I …

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The wear characteristics of the cemented carbide blades in drilling limestone with water jet were studied, which concluded that the wear rates decrease with the increase of the nozzle diameter in ...

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Drilling Performance of Rock Drill by HighPressure Water ...

In the rock drilling progress, the resistant force results in tools failure and the low drilling efficiency; thus, it is necessary to reduce the tools failure and enhance the drilling efficiency. In this paper, different configuration modes of drilling performance assisted with water jet are explored based on the mechanism and experiment analysis of rock drilling assisted with water jet.

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