Type of Document	Master's Thesis
Author	Fisher, Frank Tasman
URN	etd-09082012-040426
Title	A study of the mineralogy of roof and floor strata associated with coal mines
Degree	Master of Science
Department	Mining Engineering
Advisory Committee	Advisor Name Title Holland, Charles T. Committee Chair Nelson, B. W. Committee Member
Keywords	Coal mines and mining
Date of Defense	1961-07-25
Availability	restricted
Abstract 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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