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There is also the issue of collapsed tunnels. Pike's Peak is made of a type of granite that crumbles easily, so while it is formally considered a "hard rock" from the mining viewpoint, many of the short original tunnels on the various lines eventually collapsed, leaving what appear to be cuts. This messes up the tunnel numbering system...

by asdf on Sun Dec 6th, 2009 at 12:41:44 PM EST
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Speaking of collapsed.  I climbed Pike's Peak twice (when I was young).  Thirteen miles, all up hill, from 6K to 14k feet. As a flatlander, I can tell you I was one tired, sore pup, expecially after the first climb.  I could sympathize with those tunnels.

I can swear there ain't no heaven but I pray there ain't no hell. _ Blood Sweat & Tears
by Gringo (stargazing camel at aoldotcom) on Sun Dec 6th, 2009 at 04:01:15 PM EST
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