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

Transactions of the Institution of Mining Engineers Volume 6


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About the Book

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: ...18 inches wide and 12 feet long. The grade is J inch per foot. Then follow five circular improved Cornish buddies (Munday), and finally the tailings pass over ties outside the building. These last have a length of 20 feet and a fall of 1 inch per foot. The gold saving is effected by the mortar-box and wells, and indirectly by the blankets, buddies, and ties. No mercury is employed in the box, which the use of copper-gratings would in itself prevent, while the very free character of the gold, does not necessitate its use at this stage of the treatment. The mortar-box is roomy, and gives the gold an opportunity to separate from the pulp by the action of gravity alone. The interior length is 58 inches, interior width 16 inches, width between dies 1 inch, with an extra inch between the side dies and the ends of the box. Distance from dies to back of mortar 4 inches, from dies to screen 3 inches, and between centres of dies 11 inches. In cleaning-up, the gratings are removed, and the material inside and around the dies is shovelled into buckets and passed over a strong wire riddle 2 feet in diameter and No. 4 mesh. One of these lasts a year. The roughs from this operation go back to the mortar-box to reset the dies before restarting, l to 2 buckets being obtained at each fort In Queensland, they arc generally run through a tom or rocker, and the pyrites caught in the riffles is ground in pans. nightly clean-up. The fines are sifted into a blanket-tub, and then introduced into an amalgamating-barrel. There are five such barrels in the mill, with a capacity of 54 gallons each. They make 16 revolutions per minute and are worked from 8 to 12 horn's, 10 hours being the average time. The water is used cold; 75 lbs. of mercury are added to each charge with a bucket ful...


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Product Details
  • ISBN-13: 9781130758719
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 258
  • Spine Width: 14 mm
  • Width: 189 mm
  • ISBN-10: 1130758710
  • Publisher Date: 01 Mar 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 467 gr


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