Bulletin Volume 1, No. 1

Bulletin Volume 1, No. 1

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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. 1900 edition. Excerpt: ...ROBERT NYE, E. M. Placer mining may be conveniently divided into two distinct branches, one the working of dry gravel or land deposits, while the other is confined to gravel lying under water or only a short distance, twenty feet or less, above it. For land deposits, when sufficient water under the requisite head and good dump ground are to be had, hydraulicing is the approved method, and has been brought to a high state of perfection in some of our western states. Large areas of gravel containing gold in paying quantities, lacking some or all of these necessary conditions for successful hydraulic operations, afford a good field for the traction dredge o steam shovel. For the mining of subaqueous gravels the floating dredge has so far proved to be the only successful device brought forward. Gold dredging furnishes one of the few instances where the American mining engineer has had to go abroad for lessons. Many of the problems of dredging for gold had been solved and the industry put upon a dividend paying basis in New Zealand before it was taken up in the United States. This was not accomplished without a long and tedious period of experimentation, marked by many failures. In 1896 over sixty dredges were in operation on the Molyneux river in New Zealand, and while the dredge builders there will doubtless continue to improve their dredges, they may be said to have evolved a machine which is typical of that country, and is called the New Zealand dredge. In 1894 a dredge designed by Mr. H. J. Rieling of Chicago, after the style of those working in New Zealand, was built by the Bucyrus Company of South Milwaukee, Wis., and began operations on Grasshopper creek in Montana. It was not a success, and the following winter it was rebuilt. The second...
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Product details

  • Paperback | 30 pages
  • 189 x 246 x 2mm | 73g
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 123648892X
  • 9781236488923