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Transactions of the American Institute of Mining Engineers Volume 7

Transactions of the American Institute of Mining Engineers Volume 7


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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1879 Excerpt: ...given the contractors to penetrate a stratum of very hard, compact blue limestone. At about this point the air, which had been kept moderately good by the wheelers stopping and giving a few turns to the fan at each trip, became so bad from the continued blasting necessitated by the hardness of the rock, that two boys were employed to blow it; the instructions given them were to keep the air good at all times, and when not needed at the blower, to help the contractors in various ways, such as wheeling out the broken stone, and carrying drills to and from the blacksmith shop. The progress of the work was so much retarded by the hard rock in No. 1 tunnel, that an additional gang of two contractors and their laborers was set to work sinking No. 4 shaft, which was situated at the extreme end of the main gangway. At first the work, being carried on in the loose rock of the floor of the gangway, progressed very rapidly, but at a depth of 4 feet a solid floor of rock was met, which reached entirely across the shaft, cutting off the fault completely. This floor was quite level and smooth, the rock of which it was composed being of a moderately hard nature. A feature of this shaft was the recurrence of the floors, which were probably planes of stratification, and a portion of the bottom of the large synclinal, which distinctly shows itself in the south side of the old quarry. These floors rather expedited the work, as the rock parted along them much more easily than where they were absent. No water was found till a depth of 12 feet was reached, when the walls became damp; and at a depth of 15 feet water was struck in a drill hole. The water was evidently under considerable pressure, being ejected as from a fountain, when the drill was withdrawn, covering the floor of...


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Product Details
  • ISBN-13: 9781236455703
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 194
  • Spine Width: 10 mm
  • Width: 189 mm
  • ISBN-10: 1236455703
  • Publisher Date: 01 May 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 354 gr


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