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Rock Mechanics Investigation of Two-bed Trona Mining, Green River, Wyoming.

Authors
Kneisley-RO
Source
MISSING :22 pages
Link
NIOSHTIC No.
10002237
Abstract
Rock mechanics measurements indicate that the present two-bed mine design used at the Big Island Trona Mine, Green River, Wyoming, results in stable workings. Vertical pressure changes in the lower panel pillars and horizontal pressure changes in the lower bed roof and floor indicated negligible upper bed mining influence. Pillar stresses stabilized soon after upper bed mining was completed. Strata movements in the pillar ribs, roof, and floor were also negligible and stabilized soon after completion of upper bed mining. Using tributary area theory, the confined core approach, and studies of model trona pillars it is shown that increased extraction ratio is possible. A program of gradually increased extraction ratio accompanied by simple measurements should result in a mine design that includes both higher recovery and long-term stability.
Publication Date
19820101
Document Type
IH; Report of Investigations
Fiscal Year
1982
NTIS Accession No.
NTIS Price
Identifying No.
RI 8598
NIOSH Division
DRC;
Source Name
MISSING
State
WY;
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