Cooperative Coal Mining Series Volume 17

Cooperative Coal Mining Series Volume 17

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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: ...partially repaired. unloaded for the regrading of a switch. Figure 39 shows the nature and extent of the workings beneath the surface tracks which have subsided. The rooms were carried 30 feet wide by 300 feet long; pillars were 20 feet wide. The squeeze covered an area 1,200 feet square, and the depression at the surface was in places 4 feet. The underclay is quite soft in parts of the mine. One of the large railroad companies reports that in the La Salle district it has been necessary to raise and surface the main line track every year, the total subsidence being estimated at about 3 feet. It is reported by two railroad companies that subsidence resulting from longwall mining in the vicinity of Decatur has necessitated regrading and filling amounting to 3 to 4 feet. Room-and-pillar mining in southern Illinois has caused considerable damage to railroad tracks. Near Duquoin a track to a mine subsided 3 feet. A branch line of a railroad in Williamson County was damaged by a sink hole 6 feet in diameter and 20 feet deep. This occurred over the abandoned workings of a mine 90 feet deep. Important tracks have subsided amounts varying from a few inches to a few feet at numerous places. Important bridges have been threat FIG. 39.--Plan showing relation of railroad in figure 38 to mine workings. ened; one pier of a bridge is reported to have subsided 18 inches but without much tilting (fig. 40). It is now the practice of the railroad companies whose lines extend through mining districts to secure annually from their division engineers complete reports showing the extent of mining beneath the right-of-way. WAGON ROADS Generally the title to the coal beneath wagon roads is not reserved by the district maintaining the roads. Frequently where there...
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Product details

  • Paperback | 32 pages
  • 189 x 246 x 2mm | 77g
  • United States
  • English
  • black & white illustrations
  • 1236809904
  • 9781236809902