Bulletin Volume 28-31. North Carolina Geological Survey
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Author: North Carolina Geological Survey
Number of Pages: 196 pages
Published Date: 01 Mar 2012
Publisher: Rarebooksclub.com
Publication Country: Miami Fl, United States
Language: English
ISBN: 9781130016086
File size: 24 Mb
File Name: Bulletin.Volume.28-31.pdf
Download Link: Bulletin Volume 28-31
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1921 Excerpt: ...mining of the clay was due to the great quantity of water encountered in the shafts. At 60 feet in depth the removal of the water became a "considerable problem" and at the depth of 100 feet about half the time of operation was spent in hoisting the water to the surface in buckets. No attempt seems to have been made to get rid of the water in any other way than by bailing. The crude clay taken from the main dike yielded by washing 40 per cent of white kaolin with the composition: The refractory value of the washed kaolin was above 1,730 and its color was grade 1. Dried at 110 C., its tensile strength was 25 pounds per square inch, its shrinkage 4 per cent, and when fired at 1,350 C., 11 per cent. The standard mixture with this kaolin, fired at 1,350 C., was pure white. Its translucency was.93 and its absorption 7 per cent. The transmitted light was white. Its shrinkage at 110 C. was 3.4 per cent, and when fired at 1,350 C. was 9.9 per cent. Its color remained unaltered under glazes. 9. Cunningham Prospect Near Franklin C. C. Cunningham, Franklin, N. C. Across a valley from the east end of the Johnston property, where the main dike of kaolin is reported to have disappeared (see above), the dike reappears on the property of Mr. C. C. Cunningham, where it was worked through a number of shafts and pits as a source of mica. One shaft 25 feet deep penetrated 10 feet of overburden and 15 feet of clay. A boring in its bottom went through 35 feet more of similar clay. Two other shafts 25 feet deep and a third 60 feet deep also exposed clay all the way under the overburden. It is thought that the depth of the kaolinization increases toward the east. Mr. Cunningham reports that borings and test pits outline a dike 22 feet wide and at least 1,500 feet long. I...
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