Fireclay is any clay that can be "fired" in a refractory to make fire
bricks or similar material. Often the clay under a coal seam may
qualify. Underground roads may go out in olden times maybe a mile -
more modern mines can go out several miles. A fathom is 6 ft
Dave
>could somebody tell me what fireclay is ? and how far from the pithead do
>underground roads reach---average?how many feet is a fathom? thanks.
--
David A. Summers
Curators' Professor of Mining Engineering
Adjunct Professor of Nuclear Engineering
Director
Rock Mechanics and Explosives Research Center
University of Missouri-Rolla,
Rolla, MO 65409-0810
"fools talk, wise men listen." (a variant of Prov 12:23)
phone: (573) 341 4314
FAX: (573) 341 4368
related web pages
A growing selection of Dr. Summers' papers are being put on the Web
and can be accessed through the Bibliography
http://www.umr.edu/~rockmech/faculty/biography.html
Rock Mechanics http://www.umr.edu/~rockmech/
Waterjet Lab: http://www.umr.edu/~waterjet/
UMR Stonehenge: http://www.umr.edu/~stonehen/
Personal: http://www.umr.edu/~rockmech/data/Summers.html
Mining Eng. http://www.umr.edu/~mining/
Waterjet Assoc http://www.wjta.org/
International Waterjet Society: http://www.iw.uni-hannover.de/iswjt/
Next American Waterjet conference: http://www.wjta.org/conference.htm
Next International Waterjet Conference (Provence, 2002)
http://www.bhrgroup.co.uk/confsite/jt02home.htm
|