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A surface mine blast design has 9 holes in a row...

This question belongs to Mining Engineering Introduction To Mining Engineering
Introduction to Mining Engineering
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A surface mine blast design has 9 holes in a row, each of 8 m length and 200 mm diameter. The spacing and burden are 6 m and 5 m respectively. The length of subgrade drilling is 1 m and the density of in-situ rock is 2.43 t/m3. Assuming no back break, the output per blast in t is

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