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Title:Roof strata of the Herrin (no. 6) coal member in mines of Illinois : their geology and stability
Author(s):Krausse, Hans Friedrich; Damberger, H.H.; Nelson, W.J.; Hunt, Stephen R.; Ledvina, C.T.; Treworgy, C.G.; White, W.A.
Subject(s):Coal mines and mining
Geographic Coverage:Illinois
Abstract:Roof failures in underground coal mines are related to the lithology and geologic structure of the roof. There are two distinct suites of roof rock above the Herrin (No. 6) Coal in Illinois, and each has distinctive patterns of structure and roof failure. In black shale-limestone roof areas, roof instability is correlated with thinning of limestone beds and presence of faults and clay dikes. In gray shale roof regions, the prime roof hazards are posed by rolls, shear bodies, and presence of coal or carbonaceous partings in the roof. Most structural features examined are believed to have formed during early stages of sediment diagenesis and compaction. Structural trends and lithologic patterns are strongly interdependent for this reason. In many cases geologic patterns are so complex and locally variable that prediction of roof stability far in advance of mining is difficult. The need for greater flexibility in roof control planning is apparent.
Issue Date:1979
Publisher:Urbana, Ill. : Illinois State Geological Survey
Series/Report:Illinois minerals no. 072
Description:Includes bibliographical references (p. 54).
Rights Information:Copyright 1979 Board of Trustees University of Illinois.
Date Available in IDEALS:2013-06-24
Has Version(s):
Identifier in Online Catalog:5586473
OCLC Identifier:(OCoLC)ocm05790743

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