I forgot the camera when I was last in - carrying scaffold poles was a bit of a distraction! I'll take some pics on Thursday.
As a bit of a rough idea, the level is double width and effectively double height and the hopper was a big one, the space is pretty much filled. A LOT of stuff has come down. The thigh deep water on the outbye side does make building pack walls a bit awkward.
There's a big rock towards the bottom which might be the cause of the collapse, it has dropped and burst a pack wall (the hopper was empty).
On the positive side there isn't a big hole in Carrs Mine, or at least not one in an accessible area...
Don't look so embarrassed, it's a family trait...