[Rockhounds] Extreme Rockhounding

[John Siebel]

So I took today off and watched a Discovery Channel video titled, "Extreme 
Engineering" that, so far, covered "Widening the Panama Canal", the Boston 
"Big Dig"', building Hong Kong's Airport and the tunnel under the Alps from 
Switzerland. All of these entailed massive excavation. Does anyone know if 
these projects discovered any fun specimens? I would love to have played in 
the tailing piles of any of these projects.

John