Question: Question 3 : Ring blast design - 3 5 marks Referring to the diagram, design a drilling, charging and timing layout for the dimensions given.

Question 3: Ring blast design -35 marks
Referring to the diagram, design a drilling, charging and timing layout for the dimensions given.
Calculate the planned metres drilled, explosives required, initiation system required and the actual
powder factor. Based on basic design principles, show all the construction lines and motivate your
decisions. Please make use of basic principles for the layout / design. Do not submit a computer-
generated design. Clearly show all assumptions.
Water reservoir - Ring blast design
Rock type - Competent quartzite
Drill hole diameter: 87mm
Question 3 : Ring blast design - 3 5 marks

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