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Home > Research Bulletin Volume 1-4: (English)
Research Bulletin Volume 1-4: (English)

Research Bulletin Volume 1-4: (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. 1918 Excerpt: ...machines or top or middle-cutting machines are, however, the mathematical average of the figures reported. A study of Table V shows that as a rule, though the gradation is not marked, that increase in thickness is accompanied by an increase in size of equipment. This would be a natural conclusion, as a thicker seam allows the use of a larger car and necessitates an increase in gathering locomotive weight, main haulage locomotive weight and weight of rail required. AVERAGE MINING PRACTICE ACCORDING TO DAILY TONNAGES Table VI is a rearrangement of the material in Table V, to show the items ranked according to the daily tonnage produced. Figures for the per cent of the two types of mining machines in use were not available and therefore the averages have not been included. It may also be noted from examination of Table V and Table VI that the 5-or 6-ton locomotive is practically standard in the Pocahontas Field for gathering and the 10-or 13-ton locomotive is the usual size used for main haulage purposes. The use of large locomotives and cars has presented a track problem which has been answered by using heavy steel rail, 60 pounds to the yard in many cases. AVERAGE DEVELOPMENT PRACTICE Table VII attempts to present the customary practice in the Pocahontas Field in regard to driving entries and openings, and the usual methods of protection against roof action by means of barrier pillars. The figures on development have been classified according to seams as the characteristics of the seam, character of roof and floor, thickness and grades encountered, bring the greatest influence to bear on the width of openings and the necessity for barrier pillars. Table VII shows for the No. 3 and No. 4 Pocahontas seams, the average width of entries, the average thickness of...


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Product Details
  • ISBN-13: 9781159521486
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 82
  • Series Title: English
  • Weight: 163 gr
  • ISBN-10: 1159521484
  • Publisher Date: 01 May 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Spine Width: 4 mm
  • Width: 189 mm


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