Another interesting thing to add to the Overview, would be Red Marble Mine on the east side. Although marble was present, it appears that the main target was red magnesite that is used primarily to line steel furnaces.
"After the first glass, you see things as you wish they were. After the second, you see things as they are not. Finally, you see things as they really are, which is the most horrible thing in the world."
--Oscar Wilde on Absinthe