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Geologic investigations near an underhand cut-and-fill stope, Lucky Friday Mine, Mullan, ID.

Authors
Scott-DF
Source
Spokane, WA: U.S. Department of the Interior, Bureau of Mines, RI 9470, 1993 Feb; :1-21
Link
NIOSHTIC No.
10012131
Abstract
Researchers from the U.S. Bureau of Mines conducted geologic investigations in an area of the Lucky Friday Mine, Mullan, ID, that included the 5300-107 demonstration stope using underhand longwall cut-and-fill mining. Structural analysis of the area suggested that argillite beds form planes of weakness between blocks of brittle quartzite, and energy may be released along these planes and at the junctures of fractures. Mapping argillite beds and fractures in the stope wall rock showed that the planes of these features diverged and that their attitudes corresponded from one wall to the other. Seismic analysis showed that the number and location of events varied as each cut was mined, with about 39 pct of the total number of events occurring above the cut being mined, about 54 pct below, and 7 pct at the same elevation.
Keywords
Rock-bursts; Longwall-mining; Seismicity; Geologic-fractures; Geologic-faults; Mechanical-properties; Stresses; Coal-mining; Rock-mechanics
Publication Date
19930201
Document Type
Report of Investigations
Fiscal Year
1993
NTIS Accession No.
PB93-215739
NTIS Price
A03
Identifying No.
RI-9470
NIOSH Division
SRC
Source Name
Spokane, WA: U.S. Department of the Interior, Bureau of Mines, RI 9470
State
ID; WA
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