[redpoint5]

Originally Posted by freebeard

That's fracking. I didn't know until I looked that there is an in situ method using heat instead of water.

https://en.wikipedia.org/wiki/Shale_oil_extraction

Ahh, I didn't know what the shale I was talking about. I've got no fracking idea what I was thinking. I'm prepared to have strong opinions on the subjects though!

Originally Posted by freebeard

Cement or concrete aggregate? I saw that's it's used for aggregate, but I can't find the reference. It's probably uneconomic to move it (as a bulk material) to the point of use.

If it's an environmental hazard and the waste is sufficiently regulated, then using it as an aggregate would be an economical way to deal with it.

Then again, where does old aggregate go to die?