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Geologic Conditions Affecting Coal Mine Ground Control in the Western United States.

Authors
Sames-GP; Laird-RB
Source
MISSING :30 pages
Link
NIOSHTIC No.
10005934
Abstract
The Bureau of Mines recently initiated a study of geologic features that contribute to roof instability in western U.S. underground coal mines. The purpose of the study is to provide information for use in ground control planning and safety hazard reduction in that region, where mining activity has been increasing. Hazardous geologic conditions were surveyed in selected underground coal mines in Utah and Colorado, and both depositional and structural features were identified as potential ground hazards. Although the conditions found do not differ in kind from hazardous geologic conditions in the eastern United States, they do differ in intensity of occurrence and relative importance. Three depositional features dominate where unstable roof occurs in western underground coal mines: paleochannel deposits, crevasse splay deposits, and flood basin deposits. Three structural features identified as hazardous, but not so widespread or common as the depositional hazards, are faulting, jointing, and igneous intrusions. This survey established a foundation for future studies aimed at reducing and preventing ground control accidents in western coal mines.
Publication Date
19880101
Document Type
IH; Information Circular;
Fiscal Year
1988
NTIS Accession No.
NTIS Price
Identifying No.
IC 9172
NIOSH Division
PRC;
Source Name
MISSING
State
CO; UT;
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