MACHINE DRILLING IN MINES.
Sir G. W. Denys writes as follows :—: — " Does boring by machinery pay ? I answer decidedly, yes, wherever you have plenty of water-power aad a long distance to go. Ido not hesitate to affirm that I have driven 550 fms. with the borer, in one-third of the time, and for half the money, it would have cost to drive the same distance by. ordinary hand labour. I am, indeed, almost afraid to hazard an opinion as to what it would have cost to arive by hand labour, for at the bottom I do not believe it could or would have been driven at all. Further, wherever extensive mining operation* are intended, ■whether machine drills are to be used or not, an air compressor put up at the commencement will pay for itself five or six times over."
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Bibliographic details
Otago Witness, Issue 1342, 18 August 1877, Page 4
Word Count
140MACHINE DRILLING IN MINES. Otago Witness, Issue 1342, 18 August 1877, Page 4
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