Title page for ETD etd-09082012-040426
|Type of Document
||Fisher, Frank Tasman
||A study of the mineralogy of roof and floor strata associated with coal mines
||Master of Science
|Holland, Charles T.
|Nelson, B. W.
|Date of Defense
The first conclusion that can be drawn from these results
is the extreme variation in the size distribution of the
particles of the material. Table nine shows the maximum,
average and minimum percentes of each size found in the roof
shales, and table ten shows the same factors for the floor
clays. From the reported answers to question A we can also
see the wide range of opinion concerning roof shales. Of
those materials classed as slate, the sand size varied from
1 to 64 percent, while the material reported as draw-slate
fell between these limits with a range of sand size from
3 to 38 percent.
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