Where did it all go? Couldn’t people tell the rock fragments of used for public works, etc. aren’t coming from a traditional quarry? Just seems like a whole bunch of rock waste out there that nobody has ever explained or brought up as far as I know? .... any ideas? This been covered somewhere?
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I've asked the same question. Just look at the tailings pile from any mine, and you can see how much material needs to be accounted for.
It would be hard to remove this discretely. Perhaps not impossible, but difficult.
Photo of tunneling boring machine. https://www.giantbomb.com/tunnel-boring-machine/3055-6172/images/
Digging the tunnel is not a problem. The issue is what happens to the massive amount of tailings?
The link below speaks of melting the rock and making a shiny surface. I’ve seen photos of the tunnel after it is done.
https://www.pinterest.com/pin/280278776790176496/
The melted rock has to go somewhere.... changing it to liquid doesn’t make the mass disappear
That still doesn't solve the volume problem.