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Reducing hazards in underground coal mines through the recognition and delineation of coalbed discontinuities caused by ancient channel processes.

Authors
Kertis-CA
Source
Pittsburgh, PA: U.S. Department of the Interior, Bureau of Mines, RI 8987, 1985 Jan; :1-23
NIOSHTIC No.
10004743
Abstract
Because coalbed discontinuities often pose serious economic and safety problems in underground coal mines, criteria were documented for the recognition and prediction of discontinuities in advance of mining. Pennsylvanian strata in Indiana and Armstrong Counties, PA, were deposited as part of fluvio-deltaic complexes with channel- phase sandstones as the predominant type of coalbed discontinuity. Coalbed isopach maps constructed for this study delineated numerous want areas (areas of no coal) with elongate to linear geometries. A comparison of coalbed isopach and corresponding sandstone isolith maps of the study area revealed many examples of a thick-sandstone, thin-subjacent-coalbed relationship. Nearly 60 pct of the want areas in the study area were found to lie subjacent to thick (>20 ft [6 m]) sandstone accumulations. In addition to erosion of the coalbed, channels may contribute to coalbed splitting, coalbed thinning over paleotopographic highs, abnormal coalbed thicknesses, and deterioration of coal quality. If these features are considered, then approximately 80 pct of all interruptions in the economic coalbeds in this area result from channel activity. By using the criteria developed in this study and described in this Bureau of Mines report, the occurrence of coalbed discontinuities may be predicted and anticipated in advance of mining.
Keywords
Coal-mining; Mining-industry; Mine-shafts; Underground-mining; Structural-analysis; Methanes; Methane-drainage; Mine-gases
Publication Date
19850101
Document Type
IH; Report of Investigations
Fiscal Year
1985
NTIS Accession No.
PB86-156205
NTIS Price
A03
Identifying No.
RI-8987
NIOSH Division
PRC
Source Name
Pittsburgh, PA: U.S. Department of the Interior, Bureau of Mines, RI 8987
State
IN; PA
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