I am helping with a new DVD on the Glendalough mines and want to explain the
typical time taken to bore a shot hole by hand in the C19th. I've seen
figures for hand drilling on the surface in contests (eg 14 inch hole in 15
mins). Of course drilling speeds underground would depend upon conditions
and rock type.
Anyone know 'average' hand drilling time in granite for say a single 6 foot
hole?
Martin
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Dr. Martin Critchley, Remote Sensing Manager, ERA-Maptec Ltd, 36 Dame
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