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    Impact of blast design parameters on rock fragmentation in building stone quarries Abhishek Sharma1,*, A. K. Mishra1, B. S. Choudhary1 and Rohit Meena2 1Indian Institute of Technology (Indian School of Mines), Dhanbad 826 004, India 2Bakhrija Plot 4, Masonary Stone Mine, Gradient Business Consulting Private Limited, Narnaul 123 023, India

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    The rock blocks extracted by blasting which are larger than the opening of the primary crusher are usually fragmented by hydraulic hammer. The paper presents the results of the testing of impact of rock hardness on fragmentation of rocks by means of hydraulic hammer and during crushing in jaw crusher.