Gatwood, Elden J SAD
You are absolutely correct, and I should have stated up-front the use of that
term in the way that the railroads used it in covering everything that came
out of the earth, as opposed to rocks, minerals, compounds...
From: STMFC@... [mailto:STMFC@...] On Behalf Of
Sent: Tuesday, October 14, 2008 7:16 PM
Subject: [STMFC] Re: Mineral Service on your Roads
Tech speaking, neither sand nor gravel are minerals. They, and coal,
are rocks. Rocks are composed of minerals. A mineral is a
geologically-formed solid consists one specific chemical composition
and can be an element like sulpher or a compound like feldspar or
Coal is usually classed as a sedimentary rock (on the soft peat end
of the scale) to a metamorphic rock (on the hard anthracite end of
Of course in the RR world, we usually refer to sand, gravel, and coal
transportation as "mineral" service.
--- In STMFC@... <mailto:STMFC%40yahoogroups.com> , "Dave Nelson"
coal, was, IIRC, the second most common commodity shipped in open top
cars... a fact that likely makes it the #1 mineral, as coal isn't a
mineral (it's combustable dirt) and most sand and gravel is. And
even better, virtual every railroad moved sand and gravel so such
loads can be used by almost everybody who has a layout.
number of posts citing tonnages.