File:Coal mining in Illinois (1915) (14754513296).jpg

Identifier: coalmininginilli13andr (find matches)
Title: Coal mining in Illinois
Year: 1915 (1910s)
Authors: Andros, S. O Illinois State Geological Survey University of Illinois (Urbana-Champaign campus). Dept. of Mining Engineering United States. Bureau of Mines
Subjects: Coal mines and mining
Publisher: Urbana, (Ill.) : University of Illinois
Contributing Library: University of Illinois Urbana-Champaign
Digitizing Sponsor: University of Illinois Urbana-Champaign

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Text Appearing Before Image:
noth-ing better than a block room-and-pillar system and a typicalmine plan of this type is shown in fig. 17. These mines,however, are called panel mines and they arc listed as suchin this segregation. This perversion of the panel system isthe prime factor in the number of squeezes which have oc-curred in panel mines in Illinois. Sixty per cent of the mines listed by the Investigationsas panel mines have had squeezes as against 46 per cent inthe unmodified room-and-pillar system. The relative dimen-sions of the earlier room-and-pillar mines have often beenretained in panel mines as shown in Table 9. Inasmuch asunusually bad roof is one reason for wo iking on a panelsystem any gouging of pillars is certain to lead to a squeeze.The high percentage of squeezes in panel mines examined ascompared with that in unmodified room-and-pillar mines isnot an indictment of the panel system but is an adverse com-mentary on the bad management which allows pillar gougingand inadequate barrier pillars.
Text Appearing After Image:
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