"From the results obtained after a year and a half of operation using the long face system of conveyor mining in our thin seam of coal, four decided advantages over the old system of room and pillar work with wide rooms have been proven: 1. Operations are concentrated in small sections, thereby permitting larger tonnages to be loaded. 2. One hundred per cent extraction of the vein is obtained (with the exception of main slope pillars) which prolongs the life of the mine. 3. The ventilation of this gaseous vein is simplified. 4. Production costs are reduced"--page 15.
Mining and Nuclear Engineering
Professional Degree in Mining Engineering
Missouri School of Mines and Metallurgy
iii, 19 pages
© 1938 Bernard Degen Boyd, All rights reserved.
Thesis - Open Access
Library of Congress Subject Headings
Coal mines and mining -- Arkansas
Print OCLC #
Electronic OCLC #
Link to Catalog Recordhttp://laurel.lso.missouri.edu/record=b1068763~S5
Boyd, Bernard Degen, "Conveyor mining in the thin vein coal fields at Excelsior, Arkansas" (1938). Professional Degree Theses. 254.