Sub-grade drilling should be approx. % of the bench height. Options: A . &nbsp8 % B . &nbsp10 - 11% C . &nbsp12 -14% D . &nbsp14%

Sub-grade drilling should be approx. % of the bench height.

Question

Sub-grade drilling should be approx. % of the bench height.

Options:

A . 8 %

B . 10 - 11%

C . 12 -14%

D . 14%

Answer: Option B

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