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Coal Mining; A Supplement Published by the Engineering and Mining Journal

Coal Mining; A Supplement Published by the Engineering and Mining Journal


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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. 1908 Excerpt: ...the post and bar is used. A prop is set up on the low side and a collar placed on it. The other end of the collar being in a hitch on the high side (see Fig. 5). Gama.-tr. l'lETHODS or DEVELOPMENT In the Mammoth seam the gangway is generally driven on the bottom bench. On pitches less than 35 deg., two chutes are driven, one on each side of the breast. These chutes are generally about 6 ft. wide and 24 ft. long. At the end of the chutes the miner works up to the top rock and opens the whole seam. The breasts are 24 to 30 ft. wide. After the seam is opened out, jugular manways are started at the end of each chute and carried up each rib of the breast. In actual mining, a 6-ft. cut is first made in the bottom bench, and the manway afterward extended. Then the top coal is blown down by firing holes drilled up from the bottom bench. The coal is run down the manways to the gangway and the slate and bony coal is then left in the middle of the breast (see Fig. 6). On pitches greater than 35 deg. only one chute is driven; this is carried up about 24 ft. and a main battery is built at the end. A check battery is usually constructed about 10 ft. from the gangway. After the seam is opened out, the jugulars are carried up each rib of the breast from the main battery. The coal as it is mined is left in the breast in order to keep a place for the miner to work in. The surplus coal is thrown into the jugulars, and after the chute is full, is loaded out (see Fig. 7). After the Mammoth seam is nearly worked out, tunnels are driven north and south from the gangways in the various lifts of this bed to tap the overlying and underlying seams. It is customary to drive but one tunnel on a lift, and this one is started about 300 or 400 ft. from the slope in order to leave su...


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Product Details
  • ISBN-13: 9781236370198
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 24
  • Spine Width: 1 mm
  • Width: 189 mm
  • ISBN-10: 1236370198
  • Publisher Date: 01 May 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 64 gr


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