Don Foreman wrote:
On Thu, 13 Mar 2008 13:06:12 -0700, Gunner
wrote:

http://www.thesun.co.uk/sol/homepage...icle900459.ece

Meanwhile, last I looked anyway, regulations required a fire
extinguisher every 25 feet in a slate mine in Wales.

I've never seen slate ignited, but it must be nasty!

Slate : Metamorphosed shale. ie. clay just how hot would it
have to be to be ignited? Wonder what is flamable in a
slate mine?
...lew...