Question: With reference to Problem 32, concerning opening width in the A Level, determine a bolting plan that would allow for 90 ft wide rooms. (a)

With reference to Problem 32, concerning opening width in the A Level, determine a bolting plan that would allow for 90 ft wide rooms.

(a) Specify, bolt length, safety factor, diameter, steel grade, and spacing.

(b) Also specify the associated pillar size and pillar safety factor with respect to ore strength for the mining plan.

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