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Roof Fall Study Pocahontas #3 Seam. Interim Report 1975.

Authors
Ferm-JC; Melton-RA
Source
NTIS: PB 262-368 :86 pages
Link
NIOSHTIC No.
10008259
Abstract
The detailed geology in portions of five underground coal mines in southern West Virginia was mapped, tabulated, and analyzed with respect to roof conditions. Cross sections and maps were constructed to illustrate roof rock types and their distribution and structure. Numerous data were compiled on coal cleat orientation. The following five geologic features were identified as the chief causative factors in hazardous mine roof: roof consisting of underclay (seatearth), presence of small sandstone-filled channels or tilted slump blocks, undulating sandstone cutting across shale roof rock, interlaminated shale and sandstone (stackrock), and roof consisting of conglomerate. The chief factors contributing to good roof conditions were as follows: absence of slickensides, hard sandstone roof rock >10 feet thick, and upward gradation of roof rock from shale to sandstone.
Publication Date
19750101
Document Type
CP; Final Contract Report;
Fiscal Year
1975
NTIS Accession No.
PB-262368
NTIS Price
A06
Identifying No.
OFR 1(1)-77
NIOSH Division
PRC;
Source Name
NTIS: PB 262-368
State
SC; WV;
Performing Organization
University of South Carolina
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