With reference to Problem 6.32 data, roof rock above the upper A Level is Bonneterre dolomite that

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With reference to Problem 6.32 data, roof rock above the upper A Level is Bonneterre dolomite that is overlain by Davis shale.

(a) Determine the maximum opening width that is physically possible in the upper A Level ore horizon.

(b) With reference to Problem 6.32, assume square pillars, then determine minimum pillar width with respect to ore strength, given the results of part a.

(c) What safety factor for the A Level roof would you recommend and why?

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