Transactions of the Federated Institution of Mining Engineers Volume 6
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Transactions of the Federated Institution of Mining Engineers Volume 6

Transactions of the Federated Institution of Mining Engineers Volume 6


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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. 1894 Excerpt: ...year 1879, according to information furnished by Mr. Hewitson, the manager, the gratings used were imported from England, being made of copper j inch thick, drilled with 81 holes per square inch. When in full work the imported grating lasted twelve months, 2,200 tons of ore passing through each grating. At the Port Phillip mill, owing to its smaller area, the life of a grating reached 1 years. The protective tariff caused the imported grating to become too expensive, and one of domestic manufacture took its place. This wore for less than half the time, but six times as long as ordinary punched iron. The experience with the present lighter type of copper grating has been very good. During the last seven years, 258 gratings have been used up. Their cost was 197 6s., and during that time 181,792 tons were crushed, or at the rate of 355 (long) tons during the life of a grating. It was found that ordinary punched Russian iron lasted only one quarter the time of the new style of grating. Baize is used for the blanket strakes; the cost of this item in one year was 49 7s. 2d. During the same period the wages at the mill amounted to 1,306 4s. 9d., treating 28,820 tons of ore, or 10d. per ton. The total cost of milling, including supplies, wear and tear, treatment of pyrites, etc., amounted to 2s. 3d. At Dixon's North Clunes mill the front grating is copper with 180 holes per square inch, while the back grating is brass wire with 230 holes to 240 holes per square inch. They have 6 patent Munday buddies with iron scrapers, 2 to each 10 stamps. The pyrites is washed and treated in a Chilian mill at a cost of 1 16s. lid. per ton. The roasting of 85 tons 1 cwt. cost 89 6s. 7d., and grinding 67 15s. lid., or a total cost of 157 2s...


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Product Details
  • ISBN-13: 9781130067408
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 258
  • Spine Width: 14 mm
  • Width: 189 mm
  • ISBN-10: 1130067408
  • Publisher Date: 01 Mar 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 467 gr


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