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Mining Without Timber: (English)

Mining Without Timber: (English)

          
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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. 1911 Excerpt: ...feet of the rock back, then starting from the winzes (sunk about 100 ft. apart), another horizontal strip is taken off in the same way for 10 or 12 ft. in height, the back being supported where necessary with cribs. The waste filling sent down the winzes from the level above is built out around the timbering by trucking from the winze chutes in cars running on temporary tracks extending from the winzes. When the filling comes to a crib, another low crib is built on the new filling as near as possible to the old one and the latter then pulled down, and the crib timbers are used over and over again. The chutes and ladderways are built up level with the filling as the stope progresses as before stated. In this way the ore is taken out from wall to wall till the back is 60 ft. above the sill. It is then not considered safe to carry the back further up by horizontal stripping, but instead, starting from the winzes, the ore is taken out in diagonal strips or "rills," illustrated by Fig. 70, the slope of the back being approximately that of the filling's slope of rest. By this method of stoping the only weak place is the part where the top of the stope meets the level above. This point has to be well supported by an extra number of cribs, also the points over the edge of the filling which will by this have reached within 6 or 7 ft. of the level. The old 10x4-in bottom timbers are caught up by a line of cribs spaced on about 10-ft. centers extending from wall to wall, the bottom timbers being directly supported by long lOxl0-in. stringers laid across the tops of these cribs. In this way the old bottoms are all supported by the cribs, which are left in, and the filling shoveled up around them as close as possible. Thus, the ore is all taken out, even the l...


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Product Details
  • ISBN-13: 9781152549814
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 112
  • Series Title: English
  • Weight: 213 gr
  • ISBN-10: 1152549812
  • Publisher Date: 01 May 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Spine Width: 6 mm
  • Width: 189 mm


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