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Elements of Mining

Elements of Mining


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About the Book

This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1916 edition. Excerpt: ...material will stand in banks as in the case of soft shales, clay, hardpan and more or less consolidated gravels, a bank up to 20 ft. in height can be carried. This can be broken by undercutting with the pick to a depth of 2 to 4 ft. along the toe of the bank and then wedging or preferably breaking by light charges of black powder distributed in a row of holes back of the crest. The falling of the bank usually suffices to break the material small enough to permit of loading with shovels. The relatively large proportion of labor required unfits this method for large-scale work. The simplicity and low cost of the equipment make it a method much used under pioneering conditions such as often prevail in placer mining localities. Tayler has shown the necessity for care in the selection of the type of shovels suitable for the work and that, for loading, a shovel proportioned so as to carry a 21-lb. load is more economical than other sizes. Where hand shoveling is a conspicuous feature of the work no little attention should be paid to the selection of the type of shovel and the material from which it is constructed. Some manufacturers have made a scientific study of the shovel and have evolved types and materials which make their shovels vastly superior to the ordinary types found upon the market. The pick commonly used for soft-ground work is the "railroad pick," one end of which is pointed and the other made chisel shaped. For rock excavation, the double-pointed "drifting" pick is used. Method 2.--The breaking plough, drawn by horses, gasolene tractor, steam traction engine or by wire cables from a cylindrical drum hoist, is used for loosening. For very tough material the pick-pointed plough finds application. Three types of...


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Product Details
  • ISBN-13: 9781230090740
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 208
  • Spine Width: 11 mm
  • Width: 189 mm
  • ISBN-10: 1230090746
  • Publisher Date: 13 Sep 2013
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 381 gr


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