Quote:
Originally Posted by mcminsen
When I went by yesterday I saw a machine projecting a stream of something into the pit. At first I thought it was concrete but when I went around to the alley side to have a look I saw that it was rocks, as in large gravel. I don't recall ever seeing something like that before.
Jan.31 '19, my pics

fullsizeoutput_6bcd by mcminsen, on Flickr
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Stone Slinger! (may or not be Tm'd) They're a high-speed conveyor belt system, able to shoot those stones (or sand or dirt, etc) a good distance, with great accuracy. When I first discovered them, I'd just seen the trucks driving around, and was pretty impressed when I saw it in action, shooting stone through a wall opening, forming a nice neat pile inside.
https://www.youtube.com/watch?time_continue=27&v=i1kIfVLaGL0